# Copyright 2015 The TensorFlow Authors. All Rights Reserved. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # ============================================================================== # pylint: disable=g-short-docstring-punctuation """Sparse Tensor Representation. See also `tf.sparse.SparseTensor`. """ from __future__ import absolute_import from __future__ import division from __future__ import print_function import numbers import numpy as np from tensorflow.python.compat import compat as tf_compat from tensorflow.python.framework import constant_op from tensorflow.python.framework import dtypes from tensorflow.python.framework import ops from tensorflow.python.framework import sparse_tensor from tensorflow.python.framework import tensor_shape from tensorflow.python.framework import tensor_util from tensorflow.python.ops import array_ops from tensorflow.python.ops import check_ops from tensorflow.python.ops import control_flow_ops from tensorflow.python.ops import gen_sparse_ops from tensorflow.python.ops import math_ops from tensorflow.python.ops import special_math_ops # go/tf-wildcard-import # pylint: disable=wildcard-import from tensorflow.python.ops.gen_sparse_ops import * # pylint: enable=wildcard-import from tensorflow.python.util import compat from tensorflow.python.util import deprecation from tensorflow.python.util import dispatch from tensorflow.python.util import nest from tensorflow.python.util import tf_inspect from tensorflow.python.util.compat import collections_abc from tensorflow.python.util.tf_export import get_canonical_name_for_symbol from tensorflow.python.util.tf_export import tf_export def _convert_to_sparse_tensor(sp_input): """Convert `sp_input` to `SparseTensor` and return it. Args: sp_input: `SparseTensor` or `SparseTensorValue`. Returns: `sp_input` converted to `SparseTensor`. Raises: ValueError: if `sp_input` is neither `SparseTensor` nor `SparseTensorValue`. """ if isinstance(sp_input, sparse_tensor.SparseTensorValue): return sparse_tensor.SparseTensor.from_value(sp_input) if not isinstance(sp_input, sparse_tensor.SparseTensor): raise TypeError("Input must be a SparseTensor.") return sp_input def _convert_to_sparse_tensors(sp_inputs): """Convert `sp_inputs` to `SparseTensor` objects and return them. Args: sp_inputs: `list` or `tuple` of `SparseTensor` or `SparseTensorValue` objects. Returns: `sp_inputs` converted to `SparseTensor` objects. Raises: ValueError: if any item in `sp_inputs` is neither `SparseTensor` nor `SparseTensorValue`. """ if isinstance(sp_inputs, list): return [_convert_to_sparse_tensor(sp_input) for sp_input in sp_inputs] if isinstance(sp_inputs, tuple): return (_convert_to_sparse_tensor(sp_input) for sp_input in sp_inputs) raise TypeError("Inputs must be a list or tuple.") def _make_int64_tensor(value, name): if isinstance(value, compat.integral_types): return ops.convert_to_tensor(value, name=name, dtype=dtypes.int64) if not isinstance(value, ops.Tensor): raise TypeError("{} must be an integer value".format(name)) if value.dtype == dtypes.int64: return value return math_ops.cast(value, dtypes.int64) @tf_export("sparse.from_dense") def from_dense(tensor, name=None): """Converts a dense tensor into a sparse tensor. Only elements not equal to zero will be present in the result. The resulting `SparseTensor` has the same dtype and shape as the input. Args: tensor: A dense `Tensor` to be converted to a `SparseTensor`. name: Optional name for the op. Returns: The `SparseTensor`. """ with ops.name_scope(name, "dense_to_sparse"): tensor = ops.convert_to_tensor(tensor) indices = array_ops.where_v2( math_ops.not_equal(tensor, array_ops.zeros_like(tensor))) values = array_ops.gather_nd(tensor, indices) shape = array_ops.shape(tensor, out_type=dtypes.int64) return sparse_tensor.SparseTensor(indices, values, shape) @tf_export("sparse.expand_dims") def sparse_expand_dims(sp_input, axis=None, name=None): """Returns a tensor with an length 1 axis inserted at index `axis`. Given a tensor `input`, this operation inserts a dimension of length 1 at the dimension index `axis` of `input`'s shape. The dimension index follows python indexing rules: It's zero-based, a negative index it is counted backward from the end. This operation is useful to: * Add an outer "batch" dimension to a single element. * Align axes for broadcasting. * To add an inner vector length axis to a tensor of scalars. For example: If you have a sparse tensor with shape `[height, width, depth]`: >>> sp = tf.sparse.SparseTensor(indices=[[3,4,1]], values=[7,], ... dense_shape=[10,10,3]) You can add an outer `batch` axis by passing `axis=0`: >>> tf.sparse.expand_dims(sp, axis=0).shape.as_list() [1, 10, 10, 3] The new axis location matches Python `list.insert(axis, 1)`: >>> tf.sparse.expand_dims(sp, axis=1).shape.as_list() [10, 1, 10, 3] Following standard python indexing rules, a negative `axis` counts from the end so `axis=-1` adds an inner most dimension: >>> tf.sparse.expand_dims(sp, axis=-1).shape.as_list() [10, 10, 3, 1] Note: Unlike `tf.expand_dims` this function includes a default value for the `axis`: `-1`. So if `axis is not specified, an inner dimension is added. >>> sp.shape.as_list() [10, 10, 3] >>> tf.sparse.expand_dims(sp).shape.as_list() [10, 10, 3, 1] This operation requires that `axis` is a valid index for `input.shape`, following python indexing rules: ``` -1-tf.rank(input) <= axis <= tf.rank(input) ``` This operation is related to: * `tf.expand_dims`, which provides this functionality for dense tensors. * `tf.squeeze`, which removes dimensions of size 1, from dense tensors. * `tf.sparse.reshape`, which provides more flexible reshaping capability. Args: sp_input: A `SparseTensor`. axis: 0-D (scalar). Specifies the dimension index at which to expand the shape of `input`. Must be in the range `[-rank(sp_input) - 1, rank(sp_input)]`. Defaults to `-1`. name: The name of the output `SparseTensor`. Returns: A `SparseTensor` with the same data as `sp_input`, but its shape has an additional dimension of size 1 added. """ rank = sp_input.dense_shape.get_shape()[0] if rank is None: rank = array_ops.shape(sp_input.dense_shape)[0] axis = -1 if axis is None else axis with ops.name_scope(name, default_name="expand_dims", values=[sp_input]): if isinstance(axis, compat.integral_types): axis = ops.convert_to_tensor(axis, name="axis", dtype=dtypes.int32) elif not isinstance(axis, ops.Tensor): raise TypeError("axis must be an integer value in range [-rank(sp_input)" " - 1, rank(sp_input)]") # Convert axis to a positive value if it is negative. axis = array_ops.where_v2(axis >= 0, axis, axis + rank + 1) # Create the new column of indices for the sparse tensor by slicing # the indices and inserting a new column of indices for the new dimension. column_size = array_ops.shape(sp_input.indices)[0] new_index = array_ops.zeros([column_size, 1], dtype=dtypes.int64) indices_before = array_ops.slice(sp_input.indices, [0, 0], [-1, axis]) indices_after = array_ops.slice(sp_input.indices, [0, axis], [-1, -1]) indices = array_ops.concat( [indices_before, new_index, indices_after], axis=1) # Create the new dense shape by splicing the tensor [1] in the correct # dimension of the existing shape. shape_before = array_ops.slice(sp_input.dense_shape, [0], [axis]) shape_after = array_ops.slice(sp_input.dense_shape, [axis], [-1]) new_shape = ops.convert_to_tensor([1], name="new_shape", dtype=dtypes.int64) shape = array_ops.concat([shape_before, new_shape, shape_after], axis=0) # Create the output sparse tensor. return sparse_tensor.SparseTensor( indices=indices, values=sp_input.values, dense_shape=shape) @tf_export("sparse.eye") def sparse_eye(num_rows, num_columns=None, dtype=dtypes.float32, name=None): """Creates a two-dimensional sparse tensor with ones along the diagonal. Args: num_rows: Non-negative integer or `int32` scalar `tensor` giving the number of rows in the resulting matrix. num_columns: Optional non-negative integer or `int32` scalar `tensor` giving the number of columns in the resulting matrix. Defaults to `num_rows`. dtype: The type of element in the resulting `Tensor`. name: A name for this `Op`. Defaults to "eye". Returns: A `SparseTensor` of shape [num_rows, num_columns] with ones along the diagonal. """ with ops.name_scope(name, default_name="eye", values=[num_rows, num_columns]): num_rows = _make_int64_tensor(num_rows, "num_rows") num_columns = num_rows if num_columns is None else _make_int64_tensor( num_columns, "num_columns") # Create the sparse tensor. diag_size = math_ops.minimum(num_rows, num_columns) diag_range = math_ops.range(diag_size, dtype=dtypes.int64) return sparse_tensor.SparseTensor( indices=array_ops.stack([diag_range, diag_range], axis=1), values=array_ops.ones(diag_size, dtype=dtype), dense_shape=[num_rows, num_columns]) # pylint: disable=protected-access @tf_export(v1=["sparse.concat", "sparse_concat"]) @deprecation.deprecated_endpoints("sparse_concat") @deprecation.deprecated_args( None, "concat_dim is deprecated, use axis instead", "concat_dim") def sparse_concat(axis, sp_inputs, name=None, expand_nonconcat_dim=False, concat_dim=None, expand_nonconcat_dims=None): """Concatenates a list of `SparseTensor` along the specified dimension. Concatenation is with respect to the dense versions of each sparse input. It is assumed that each inputs is a `SparseTensor` whose elements are ordered along increasing dimension number. If expand_nonconcat_dim is False, all inputs' shapes must match, except for the concat dimension. If expand_nonconcat_dim is True, then inputs' shapes are allowed to vary among all inputs. The `indices`, `values`, and `shapes` lists must have the same length. If expand_nonconcat_dim is False, then the output shape is identical to the inputs', except along the concat dimension, where it is the sum of the inputs' sizes along that dimension. If expand_nonconcat_dim is True, then the output shape along the non-concat dimensions will be expand to be the largest among all inputs, and it is the sum of the inputs sizes along the concat dimension. The output elements will be resorted to preserve the sort order along increasing dimension number. This op runs in `O(M log M)` time, where `M` is the total number of non-empty values across all inputs. This is due to the need for an internal sort in order to concatenate efficiently across an arbitrary dimension. For example, if `axis = 1` and the inputs are sp_inputs[0]: shape = [2, 3] [0, 2]: "a" [1, 0]: "b" [1, 1]: "c" sp_inputs[1]: shape = [2, 4] [0, 1]: "d" [0, 2]: "e" then the output will be shape = [2, 7] [0, 2]: "a" [0, 4]: "d" [0, 5]: "e" [1, 0]: "b" [1, 1]: "c" Graphically this is equivalent to doing [ a] concat [ d e ] = [ a d e ] [b c ] [ ] [b c ] Another example, if 'axis = 1' and the inputs are sp_inputs[0]: shape = [3, 3] [0, 2]: "a" [1, 0]: "b" [2, 1]: "c" sp_inputs[1]: shape = [2, 4] [0, 1]: "d" [0, 2]: "e" if expand_nonconcat_dim = False, this will result in an error. But if expand_nonconcat_dim = True, this will result in: shape = [3, 7] [0, 2]: "a" [0, 4]: "d" [0, 5]: "e" [1, 0]: "b" [2, 1]: "c" Graphically this is equivalent to doing [ a] concat [ d e ] = [ a d e ] [b ] [ ] [b ] [ c ] [ c ] Args: axis: Dimension to concatenate along. Must be in range [-rank, rank), where rank is the number of dimensions in each input `SparseTensor`. sp_inputs: List of `SparseTensor` to concatenate. name: A name prefix for the returned tensors (optional). expand_nonconcat_dim: Whether to allow the expansion in the non-concat dimensions. Defaulted to False. concat_dim: The old (deprecated) name for axis. expand_nonconcat_dims: alias for expand_nonconcat_dim Returns: A `SparseTensor` with the concatenated output. Raises: TypeError: If `sp_inputs` is not a list of `SparseTensor`. """ expand_nonconcat_dim = deprecation.deprecated_argument_lookup( "expand_nonconcat_dims", expand_nonconcat_dims, "expand_nonconcat_dim", expand_nonconcat_dim) if expand_nonconcat_dims is not None: expand_nonconcat_dim = expand_nonconcat_dims axis = deprecation.deprecated_argument_lookup("axis", axis, "concat_dim", concat_dim) return sparse_concat_v2(axis, sp_inputs, expand_nonconcat_dim, name) @tf_export("sparse.concat", v1=[]) def sparse_concat_v2(axis, sp_inputs, expand_nonconcat_dims=False, name=None): # pylint: disable=missing-docstring sp_inputs = _convert_to_sparse_tensors(sp_inputs) if len(sp_inputs) == 1: # Degenerate case of one tensor. return sp_inputs[0] inds = [sp_input.indices for sp_input in sp_inputs] vals = [sp_input.values for sp_input in sp_inputs] shapes = [sp_input.dense_shape for sp_input in sp_inputs] if expand_nonconcat_dims: max_shape = math_ops.reduce_max( array_ops.concat( [array_ops.reshape(shape, [1, -1]) for shape in shapes], 0), 0) shapes = [ array_ops.concat([ max_shape[:axis], shape[-1:] if axis == -1 else shape[axis:axis + 1], [] if axis == -1 else max_shape[axis + 1:] ], 0) for shape in shapes ] output_ind, output_val, output_shape = ( gen_sparse_ops.sparse_concat(inds, vals, shapes, axis, name=name)) shapes_value = [tensor_util.constant_value(shape) for shape in shapes] if shapes_value and all(shape is not None for shape in shapes_value): dim = sum(shape[axis] for shape in shapes_value) output_shape = shapes_value[0] output_shape[axis] = dim output_shape = ops.convert_to_tensor(output_shape) return sparse_tensor.SparseTensor(output_ind, output_val, output_shape) sparse_concat_v2.__doc__ = sparse_concat.__doc__.replace( " concat_dim: The old (deprecated) name for axis.\n", "") @tf_export(v1=["sparse.add", "sparse_add"]) @deprecation.deprecated_endpoints("sparse_add") @deprecation.deprecated_args( None, "thresh is deprecated, use threshold instead", "thresh") def sparse_add(a, b, threshold=None, thresh=None): """Adds two tensors, at least one of each is a `SparseTensor`. If one `SparseTensor` and one `Tensor` are passed in, returns a `Tensor`. If both arguments are `SparseTensor`s, this returns a `SparseTensor`. The order of arguments does not matter. Use vanilla `tf.add()` for adding two dense `Tensor`s. The shapes of the two operands must match: broadcasting is not supported. The indices of any input `SparseTensor` are assumed ordered in standard lexicographic order. If this is not the case, before this step run `SparseReorder` to restore index ordering. If both arguments are sparse, we perform "clipping" as follows. By default, if two values sum to zero at some index, the output `SparseTensor` would still include that particular location in its index, storing a zero in the corresponding value slot. To override this, callers can specify `thresh`, indicating that if the sum has a magnitude strictly smaller than `thresh`, its corresponding value and index would then not be included. In particular, `thresh == 0.0` (default) means everything is kept and actual thresholding happens only for a positive value. For example, suppose the logical sum of two sparse operands is (densified): [ 2] [.1 0] [ 6 -.2] Then, * `thresh == 0` (the default): all 5 index/value pairs will be returned. * `thresh == 0.11`: only .1 and 0 will vanish, and the remaining three index/value pairs will be returned. * `thresh == 0.21`: .1, 0, and -.2 will vanish. Args: a: The first operand; `SparseTensor` or `Tensor`. b: The second operand; `SparseTensor` or `Tensor`. At least one operand must be sparse. threshold: An optional 0-D `Tensor` (defaults to `0`). The magnitude threshold that determines if an output value/index pair takes space. Its dtype should match that of the values if they are real; if the latter are complex64/complex128, then the dtype should be float32/float64, correspondingly. thresh: Deprecated alias for `threshold`. Returns: A `SparseTensor` or a `Tensor`, representing the sum. Raises: TypeError: If both `a` and `b` are `Tensor`s. Use `tf.add()` instead. """ threshold = deprecation.deprecated_argument_lookup("threshold", threshold, "thresh", thresh) if threshold is None: threshold = 0 return sparse_add_v2(a, b, threshold) @tf_export("sparse.add", v1=[]) def sparse_add_v2(a, b, threshold=0): """Adds two tensors, at least one of each is a `SparseTensor`. If one `SparseTensor` and one `Tensor` are passed in, returns a `Tensor`. If both arguments are `SparseTensor`s, this returns a `SparseTensor`. The order of arguments does not matter. Use vanilla `tf.add()` for adding two dense `Tensor`s. The shapes of the two operands must match: broadcasting is not supported. The indices of any input `SparseTensor` are assumed ordered in standard lexicographic order. If this is not the case, before this step run `SparseReorder` to restore index ordering. If both arguments are sparse, we perform "clipping" as follows. By default, if two values sum to zero at some index, the output `SparseTensor` would still include that particular location in its index, storing a zero in the corresponding value slot. To override this, callers can specify `threshold`, indicating that if the sum has a magnitude strictly smaller than `threshold`, its corresponding value and index would then not be included. In particular, `threshold == 0.0` (default) means everything is kept and actual thresholding happens only for a positive value. For example, suppose the logical sum of two sparse operands is (densified): [ 2] [.1 0] [ 6 -.2] Then, * `threshold == 0` (the default): all 5 index/value pairs will be returned. * `threshold == 0.11`: only .1 and 0 will vanish, and the remaining three index/value pairs will be returned. * `threshold == 0.21`: .1, 0, and -.2 will vanish. Args: a: The first operand; `SparseTensor` or `Tensor`. b: The second operand; `SparseTensor` or `Tensor`. At least one operand must be sparse. threshold: A 0-D `Tensor`. The magnitude threshold that determines if an output value/index pair takes space. Its dtype should match that of the values if they are real; if the latter are complex64/complex128, then the dtype should be float32/float64, correspondingly. Returns: A `SparseTensor` or a `Tensor`, representing the sum. Raises: TypeError: If both `a` and `b` are `Tensor`s. Use `tf.add()` instead. """ sparse_classes = (sparse_tensor.SparseTensor, sparse_tensor.SparseTensorValue) if not any(isinstance(inp, sparse_classes) for inp in [a, b]): raise TypeError("At least one input should be SparseTensor; do you mean to" " use tf.add()?") if all(isinstance(inp, sparse_classes) for inp in [a, b]): a = _convert_to_sparse_tensor(a) b = _convert_to_sparse_tensor(b) threshold = ops.convert_to_tensor( threshold, dtype=a.values.dtype.real_dtype.base_dtype, name="threshold") output_ind, output_val, output_shape = ( gen_sparse_ops.sparse_add(a.indices, a.values, a.dense_shape, b.indices, b.values, b.dense_shape, threshold)) # Attempt to get output_shape statically. a.get_shape().assert_is_compatible_with(b.get_shape()) static_shape = array_ops.broadcast_static_shape(a.get_shape(), b.get_shape()) if static_shape.is_fully_defined(): output_shape = static_shape.as_list() return sparse_tensor.SparseTensor(output_ind, output_val, output_shape) else: # swap to make `a` the SparseTensor. if isinstance(b, sparse_classes): a, b = b, a return gen_sparse_ops.sparse_tensor_dense_add(a.indices, a.values, a.dense_shape, b) @tf_export("sparse.cross") def sparse_cross(inputs, name=None, separator=None): """Generates sparse cross from a list of sparse and dense tensors. For example, if the inputs are * inputs[0]: SparseTensor with shape = [2, 2] [0, 0]: "a" [1, 0]: "b" [1, 1]: "c" * inputs[1]: SparseTensor with shape = [2, 1] [0, 0]: "d" [1, 0]: "e" * inputs[2]: Tensor [["f"], ["g"]] then the output will be: shape = [2, 2] [0, 0]: "a_X_d_X_f" [1, 0]: "b_X_e_X_g" [1, 1]: "c_X_e_X_g" Customized separator "_Y_": >>> inp_0 = tf.constant([['a'], ['b']]) >>> inp_1 = tf.constant([['c'], ['d']]) >>> output = tf.sparse.cross([inp_0, inp_1], separator='_Y_') >>> output.values Args: inputs: An iterable of `Tensor` or `SparseTensor`. name: Optional name for the op. separator: A string added between each string being joined. Defaults to '_X_'. Returns: A `SparseTensor` of type `string`. """ if separator is None and not tf_compat.forward_compatible(2020, 6, 14): return _sparse_cross_internal(inputs=inputs, hashed_output=False, name=name) if separator is None: separator = "_X_" separator = ops.convert_to_tensor(separator, dtypes.string) indices, values, shapes, dense_inputs = _sparse_cross_internval_v2(inputs) indices_out, values_out, shape_out = gen_sparse_ops.sparse_cross_v2( indices=indices, values=values, shapes=shapes, dense_inputs=dense_inputs, sep=separator, name=name) return sparse_tensor.SparseTensor(indices_out, values_out, shape_out) _sparse_cross = sparse_cross @tf_export("sparse.cross_hashed") def sparse_cross_hashed(inputs, num_buckets=0, hash_key=None, name=None): """Generates hashed sparse cross from a list of sparse and dense tensors. For example, if the inputs are * inputs[0]: SparseTensor with shape = [2, 2] [0, 0]: "a" [1, 0]: "b" [1, 1]: "c" * inputs[1]: SparseTensor with shape = [2, 1] [0, 0]: "d" [1, 0]: "e" * inputs[2]: Tensor [["f"], ["g"]] then the output will be: shape = [2, 2] [0, 0]: FingerprintCat64( Fingerprint64("f"), FingerprintCat64( Fingerprint64("d"), Fingerprint64("a"))) [1, 0]: FingerprintCat64( Fingerprint64("g"), FingerprintCat64( Fingerprint64("e"), Fingerprint64("b"))) [1, 1]: FingerprintCat64( Fingerprint64("g"), FingerprintCat64( Fingerprint64("e"), Fingerprint64("c"))) Args: inputs: An iterable of `Tensor` or `SparseTensor`. num_buckets: An `int` that is `>= 0`. output = hashed_value%num_buckets if num_buckets > 0 else hashed_value. hash_key: Integer hash_key that will be used by the `FingerprintCat64` function. If not given, will use a default key. name: Optional name for the op. Returns: A `SparseTensor` of type `int64`. """ return _sparse_cross_internal( inputs=inputs, hashed_output=True, num_buckets=num_buckets, hash_key=hash_key, name=name) _sparse_cross_hashed = sparse_cross_hashed _DEFAULT_HASH_KEY = 0xDECAFCAFFE def _sparse_cross_internval_v2(inputs): """See gen_sparse_ops.sparse_cross_v2.""" if not isinstance(inputs, (tuple, list)): raise TypeError("Inputs must be a list") if not all( isinstance(i, sparse_tensor.SparseTensor) or isinstance(i, ops.Tensor) for i in inputs): raise TypeError("All inputs must be Tensor or SparseTensor.") sparse_inputs = [ i for i in inputs if isinstance(i, sparse_tensor.SparseTensor) ] dense_inputs = [ i for i in inputs if not isinstance(i, sparse_tensor.SparseTensor) ] indices = [sp_input.indices for sp_input in sparse_inputs] values = [sp_input.values for sp_input in sparse_inputs] shapes = [sp_input.dense_shape for sp_input in sparse_inputs] for i in range(len(values)): if values[i].dtype != dtypes.string: values[i] = math_ops.cast(values[i], dtypes.int64) for i in range(len(dense_inputs)): if dense_inputs[i].dtype != dtypes.string: dense_inputs[i] = math_ops.cast(dense_inputs[i], dtypes.int64) return indices, values, shapes, dense_inputs def _sparse_cross_internal(inputs, hashed_output=False, num_buckets=0, hash_key=None, name=None): """See gen_sparse_ops.sparse_cross.""" if not isinstance(inputs, (tuple, list)): raise TypeError("Inputs must be a list") if not all( isinstance(i, sparse_tensor.SparseTensor) or isinstance(i, ops.Tensor) for i in inputs): raise TypeError("All inputs must be SparseTensors") sparse_inputs = [ i for i in inputs if isinstance(i, sparse_tensor.SparseTensor) ] dense_inputs = [ i for i in inputs if not isinstance(i, sparse_tensor.SparseTensor) ] indices = [sp_input.indices for sp_input in sparse_inputs] values = [sp_input.values for sp_input in sparse_inputs] shapes = [sp_input.dense_shape for sp_input in sparse_inputs] out_type = dtypes.int64 if hashed_output else dtypes.string internal_type = dtypes.string for i in range(len(values)): if values[i].dtype != dtypes.string: values[i] = math_ops.cast(values[i], dtypes.int64) internal_type = dtypes.int64 for i in range(len(dense_inputs)): if dense_inputs[i].dtype != dtypes.string: dense_inputs[i] = math_ops.cast(dense_inputs[i], dtypes.int64) internal_type = dtypes.int64 indices_out, values_out, shape_out = gen_sparse_ops.sparse_cross( indices=indices, values=values, shapes=shapes, dense_inputs=dense_inputs, hashed_output=hashed_output, num_buckets=num_buckets, hash_key=hash_key or _DEFAULT_HASH_KEY, out_type=out_type, internal_type=internal_type, name=name) return sparse_tensor.SparseTensor(indices_out, values_out, shape_out) def sparse_dense_cwise_add(sp_t, dense_t): """Adds up a SparseTensor and a dense Tensor, using these special rules: (1) Broadcasts the dense side to have the same shape as the sparse side, if eligible; (2) Then, only the dense values pointed to by the indices of the SparseTensor participate in the cwise addition. By the rules, the result is a logical SparseTensor with exactly the same indices and shape, but possibly with different non-zero values. The output of this Op is the resultant non-zero values. Args: sp_t: the SparseTensor operand. dense_t: the dense Tensor operand; must have the same dtype and a broadcast-compatible shape as `sp_t`. Returns: output: the SparseTensor output. """ result = gen_sparse_ops.sparse_dense_cwise_add(sp_t.indices, sp_t.values, sp_t.dense_shape, dense_t) return sparse_tensor.SparseTensor(sp_t.indices, result, sp_t.dense_shape) @tf_export("sparse.reorder", v1=["sparse.reorder", "sparse_reorder"]) @deprecation.deprecated_endpoints("sparse_reorder") def sparse_reorder(sp_input, name=None): """Reorders a `SparseTensor` into the canonical, row-major ordering. Note that by convention, all sparse ops preserve the canonical ordering along increasing dimension number. The only time ordering can be violated is during manual manipulation of the indices and values to add entries. Reordering does not affect the shape of the `SparseTensor`. For example, if `sp_input` has shape `[4, 5]` and `indices` / `values`: [0, 3]: b [0, 1]: a [3, 1]: d [2, 0]: c then the output will be a `SparseTensor` of shape `[4, 5]` and `indices` / `values`: [0, 1]: a [0, 3]: b [2, 0]: c [3, 1]: d Args: sp_input: The input `SparseTensor`. name: A name prefix for the returned tensors (optional) Returns: A `SparseTensor` with the same shape and non-empty values, but in canonical ordering. Raises: TypeError: If `sp_input` is not a `SparseTensor`. """ sp_input = _convert_to_sparse_tensor(sp_input) reordered_ind, reordered_val = ( gen_sparse_ops.sparse_reorder( sp_input.indices, sp_input.values, sp_input.dense_shape, name=name)) if sp_input.get_shape().is_fully_defined(): dense_shape = sp_input.get_shape().as_list() else: dense_shape = array_ops.identity(sp_input.dense_shape) return sparse_tensor.SparseTensor(reordered_ind, reordered_val, dense_shape) @tf_export("sparse.reshape", v1=["sparse.reshape", "sparse_reshape"]) @deprecation.deprecated_endpoints("sparse_reshape") def sparse_reshape(sp_input, shape, name=None): """Reshapes a `SparseTensor` to represent values in a new dense shape. This operation has the same semantics as `reshape` on the represented dense tensor. The indices of non-empty values in `sp_input` are recomputed based on the new dense shape, and a new `SparseTensor` is returned containing the new indices and new shape. The order of non-empty values in `sp_input` is unchanged. If one component of `shape` is the special value -1, the size of that dimension is computed so that the total dense size remains constant. At most one component of `shape` can be -1. The number of dense elements implied by `shape` must be the same as the number of dense elements originally represented by `sp_input`. For example, if `sp_input` has shape `[2, 3, 6]` and `indices` / `values`: [0, 0, 0]: a [0, 0, 1]: b [0, 1, 0]: c [1, 0, 0]: d [1, 2, 3]: e and `shape` is `[9, -1]`, then the output will be a `SparseTensor` of shape `[9, 4]` and `indices` / `values`: [0, 0]: a [0, 1]: b [1, 2]: c [4, 2]: d [8, 1]: e Args: sp_input: The input `SparseTensor`. shape: A 1-D (vector) int64 `Tensor` specifying the new dense shape of the represented `SparseTensor`. name: A name prefix for the returned tensors (optional) Returns: A `SparseTensor` with the same non-empty values but with indices calculated by the new dense shape. Raises: TypeError: If `sp_input` is not a `SparseTensor`. ValueError: If argument `shape` requests a `SparseTensor` with a different number of elements than `sp_input`. ValueError: If `shape` has more than one inferred (== -1) dimension. """ sp_input = _convert_to_sparse_tensor(sp_input) shape = math_ops.cast(shape, dtype=dtypes.int64) with ops.name_scope(name, "SparseReshape", [sp_input]) as name: reshaped_ind, reshaped_shape = gen_sparse_ops.sparse_reshape( sp_input.indices, sp_input.dense_shape, shape, name=name) reshaped_shape_const = tensor_util.constant_value_as_shape(shape) reshaped_shape_const = ( reshaped_shape_const.as_list() if reshaped_shape_const.ndims is not None else None) if (reshaped_shape_const is not None and sp_input.shape.is_fully_defined()): # constant_value_as_shape tends to get more information about the partial # shape values, but here we specifically need to know if the *user* passed # a shape with 2+ unknown dimensions; and for that constant_value # provides either the user's direct value or None if only partial elements # are known via the python shape inference code. shape_const_by_user = tensor_util.constant_value(shape) if shape_const_by_user is not None: num_implied_by_user = sum(d == -1 for d in shape_const_by_user) if num_implied_by_user > 1: raise ValueError( "At most one dimension can be inferred (-1). Found: %s" % shape_const_by_user) original_reshaped_shape = list(reshaped_shape_const) # A copy in_shape_size = np.prod(sp_input.shape.as_list()) num_implied = sum(dim is None for dim in reshaped_shape_const) # If there is a 0 dim in the user-provided shape, we cannot infer the # unknown dim reliably. This is why we skip the `if` branch below when # a 0 is present in `reshaped_shape_const`. Same below. if num_implied == 1 and 0 not in reshaped_shape_const: implied_idx = original_reshaped_shape.index(None) non_implied_idx = ( original_reshaped_shape[:implied_idx] + original_reshaped_shape[implied_idx + 1:]) reshaped_shape_const[implied_idx] = int( in_shape_size // np.prod(non_implied_idx)) if num_implied == 0 or (num_implied == 1 and 0 not in reshaped_shape_const): reshaped_size = np.prod(reshaped_shape_const) if reshaped_size != in_shape_size: raise ValueError( "Cannot reshape a tensor with %d elements to shape %s " "(%d elements)." % (in_shape_size, original_reshaped_shape, reshaped_size)) reshaped_shape = constant_op.constant( reshaped_shape_const, dtype=dtypes.int64) return sparse_tensor.SparseTensor(reshaped_ind, array_ops.identity(sp_input.values), reshaped_shape) # TODO(aselle): Remove keyword required once for 1.0 final class KeywordRequired(object): def __repr__(self): # This is needed to make documentation without fully qualified module paths return "KeywordRequired()" @tf_export(v1=["sparse.split", "sparse_split"]) @deprecation.deprecated_endpoints("sparse_split") @deprecation.deprecated_args( None, "split_dim is deprecated, use axis instead", "split_dim") def sparse_split(keyword_required=KeywordRequired(), sp_input=None, num_split=None, axis=None, name=None, split_dim=None): """Split a `SparseTensor` into `num_split` tensors along `axis`. If the `sp_input.dense_shape[axis]` is not an integer multiple of `num_split` each slice starting from 0:`shape[axis] % num_split` gets extra one dimension. For example, if `axis = 1` and `num_split = 2` and the input is: input_tensor = shape = [2, 7] [ a d e ] [b c ] Graphically the output tensors are: output_tensor[0] = [ a ] [b c ] output_tensor[1] = [ d e ] [ ] Args: keyword_required: Python 2 standin for * (temporary for argument reorder) sp_input: The `SparseTensor` to split. num_split: A Python integer. The number of ways to split. axis: A 0-D `int32` `Tensor`. The dimension along which to split. Must be in range [-rank, rank), where rank is the number of dimensions in the input `SparseTensor`. name: A name for the operation (optional). split_dim: Deprecated old name for axis. Returns: `num_split` `SparseTensor` objects resulting from splitting `value`. Raises: TypeError: If `sp_input` is not a `SparseTensor`. ValueError: If the deprecated `split_dim` and `axis` are both non None. """ if not isinstance(keyword_required, KeywordRequired): raise ValueError("Keyword arguments are required for this function.") if sp_input is None: raise ValueError("sp_input is required") if num_split is None: raise ValueError("num_split is required") if axis is None: raise ValueError("axis is required") axis = deprecation.deprecated_argument_lookup("axis", axis, "split_dim", split_dim) sp_input = _convert_to_sparse_tensor(sp_input) output_inds, output_vals, output_shapes = ( gen_sparse_ops.sparse_split( axis, sp_input.indices, sp_input.values, sp_input.dense_shape, num_split, name=name)) sparse_tensors = [] for i in range(0, num_split): sparse_tensors.append( sparse_tensor.SparseTensor(output_inds[i], output_vals[i], output_shapes[i])) return sparse_tensors @tf_export("sparse.split", v1=[]) def sparse_split_v2(sp_input=None, num_split=None, axis=None, name=None): """Split a `SparseTensor` into `num_split` tensors along `axis`. If the `sp_input.dense_shape[axis]` is not an integer multiple of `num_split` each slice starting from 0:`shape[axis] % num_split` gets extra one dimension. For example: >>> indices = [[0, 2], [0, 4], [0, 5], [1, 0], [1, 1]] >>> values = [1, 2, 3, 4, 5] >>> t = tf.SparseTensor(indices=indices, values=values, dense_shape=[2, 7]) >>> tf.sparse.to_dense(t) >>> output = tf.sparse.split(sp_input=t, num_split=2, axis=1) >>> tf.sparse.to_dense(output[0]) >>> tf.sparse.to_dense(output[1]) >>> output = tf.sparse.split(sp_input=t, num_split=2, axis=0) >>> tf.sparse.to_dense(output[0]) >>> tf.sparse.to_dense(output[1]) >>> output = tf.sparse.split(sp_input=t, num_split=2, axis=-1) >>> tf.sparse.to_dense(output[0]) >>> tf.sparse.to_dense(output[1]) Args: sp_input: The `SparseTensor` to split. num_split: A Python integer. The number of ways to split. axis: A 0-D `int32` `Tensor`. The dimension along which to split. Must be in range [-rank, rank), where rank is the number of dimensions in the input `SparseTensor`. name: A name for the operation (optional). Returns: `num_split` `SparseTensor` objects resulting from splitting `value`. Raises: TypeError: If `sp_input` is not a `SparseTensor`. """ return sparse_split(sp_input=sp_input, num_split=num_split, axis=axis, name=name, split_dim=None) @tf_export("sparse.slice", v1=["sparse.slice", "sparse_slice"]) @deprecation.deprecated_endpoints("sparse_slice") def sparse_slice(sp_input, start, size, name=None): """Slice a `SparseTensor` based on the `start` and `size. For example, if the input is input_tensor = shape = [2, 7] [ a d e ] [b c ] Graphically the output tensors are: sparse.slice([0, 0], [2, 4]) = shape = [2, 4] [ a ] [b c ] sparse.slice([0, 4], [2, 3]) = shape = [2, 3] [ d e ] [ ] Args: sp_input: The `SparseTensor` to split. start: 1-D. tensor represents the start of the slice. size: 1-D. tensor represents the size of the slice. name: A name for the operation (optional). Returns: A `SparseTensor` objects resulting from splicing. Raises: TypeError: If `sp_input` is not a `SparseTensor`. """ sp_input = _convert_to_sparse_tensor(sp_input) start = ops.convert_to_tensor(start, dtypes.int64) size = ops.convert_to_tensor(size, dtypes.int64) with ops.name_scope(name, "SparseSlice", [sp_input]) as name: output_indices, output_values, output_shape = gen_sparse_ops.sparse_slice( sp_input.indices, sp_input.values, sp_input.dense_shape, start, size, name=name) return sparse_tensor.SparseTensor(output_indices, output_values, output_shape) @tf_export(v1=["sparse_to_dense"]) @dispatch.add_dispatch_support @deprecation.deprecated( None, "Create a `tf.sparse.SparseTensor` and use `tf.sparse.to_dense` instead.") def sparse_to_dense(sparse_indices, output_shape, sparse_values, default_value=0, validate_indices=True, name=None): """Converts a sparse representation into a dense tensor. Builds an array `dense` with shape `output_shape` such that ```python # If sparse_indices is scalar dense[i] = (i == sparse_indices ? sparse_values : default_value) # If sparse_indices is a vector, then for each i dense[sparse_indices[i]] = sparse_values[i] # If sparse_indices is an n by d matrix, then for each i in [0, n) dense[sparse_indices[i][0], ..., sparse_indices[i][d-1]] = sparse_values[i] ``` All other values in `dense` are set to `default_value`. If `sparse_values` is a scalar, all sparse indices are set to this single value. Indices should be sorted in lexicographic order, and indices must not contain any repeats. If `validate_indices` is True, these properties are checked during execution. Args: sparse_indices: A 0-D, 1-D, or 2-D `Tensor` of type `int32` or `int64`. `sparse_indices[i]` contains the complete index where `sparse_values[i]` will be placed. output_shape: A 1-D `Tensor` of the same type as `sparse_indices`. Shape of the dense output tensor. sparse_values: A 0-D or 1-D `Tensor`. Values corresponding to each row of `sparse_indices`, or a scalar value to be used for all sparse indices. default_value: A 0-D `Tensor` of the same type as `sparse_values`. Value to set for indices not specified in `sparse_indices`. Defaults to zero. validate_indices: A boolean value. If True, indices are checked to make sure they are sorted in lexicographic order and that there are no repeats. name: A name for the operation (optional). Returns: Dense `Tensor` of shape `output_shape`. Has the same type as `sparse_values`. """ return gen_sparse_ops.sparse_to_dense( sparse_indices, output_shape, sparse_values, default_value=default_value, validate_indices=validate_indices, name=name) @tf_export("sparse.reduce_max", v1=[]) def sparse_reduce_max_v2( sp_input, axis=None, keepdims=None, output_is_sparse=False, name=None): """Computes the max of elements across dimensions of a SparseTensor. This Op takes a SparseTensor and is the sparse counterpart to `tf.reduce_max()`. In particular, this Op also returns a dense `Tensor` if `output_is_sparse` is `False`, or a `SparseTensor` if `output_is_sparse` is `True`. Note: A gradient is not defined for this function, so it can't be used in training models that need gradient descent. Reduces `sp_input` along the dimensions given in `axis`. Unless `keepdims` is true, the rank of the tensor is reduced by 1 for each entry in `axis`. If `keepdims` is true, the reduced dimensions are retained with length 1. If `axis` has no entries, all dimensions are reduced, and a tensor with a single element is returned. Additionally, the axes can be negative, similar to the indexing rules in Python. The values not defined in `sp_input` don't participate in the reduce max, as opposed to be implicitly assumed 0 -- hence it can return negative values for sparse `axis`. But, in case there are no values in `axis`, it will reduce to 0. See second example below. For example: ```python # 'x' represents [[1, ?, 2] # [?, 3, ?]] # where ? is implicitly-zero. tf.sparse.reduce_max(x) ==> 3 tf.sparse.reduce_max(x, 0) ==> [1, 3, 2] tf.sparse.reduce_max(x, 1) ==> [2, 3] # Can also use -1 as the axis. tf.sparse.reduce_max(x, 1, keepdims=True) ==> [[2], [3]] tf.sparse.reduce_max(x, [0, 1]) ==> 3 # 'y' represents [[-7, ?] # [ 4, 3] # [ ?, ?] tf.sparse.reduce_max(x, 1) ==> [-7, 4, 0] ``` Args: sp_input: The SparseTensor to reduce. Should have numeric type. axis: The dimensions to reduce; list or scalar. If `None` (the default), reduces all dimensions. keepdims: If true, retain reduced dimensions with length 1. output_is_sparse: If true, returns a `SparseTensor` instead of a dense `Tensor` (the default). name: A name for the operation (optional). Returns: The reduced Tensor or the reduced SparseTensor if `output_is_sparse` is True. """ if keepdims is None: keepdims = False if output_is_sparse: output_ind, output_val, output_shape = ( gen_sparse_ops.sparse_reduce_max_sparse( sp_input.indices, sp_input.values, sp_input.dense_shape, math_ops._ReductionDims(sp_input, axis), keepdims, name=name)) return sparse_tensor.SparseTensor(output_ind, output_val, output_shape) return gen_sparse_ops.sparse_reduce_max( sp_input.indices, sp_input.values, sp_input.dense_shape, math_ops._ReductionDims(sp_input, axis), keepdims, name=name) @tf_export(v1=["sparse.reduce_max", "sparse_reduce_max"]) @deprecation.deprecated_endpoints("sparse_reduce_max") @deprecation.deprecated_args( None, "keep_dims is deprecated, use keepdims instead", "keep_dims") @deprecation.deprecated_args( None, "reduction_axes is deprecated, use axis instead", "reduction_axes") def sparse_reduce_max(sp_input, axis=None, keepdims=None, reduction_axes=None, keep_dims=None): """Computes the max of elements across dimensions of a SparseTensor. This Op takes a SparseTensor and is the sparse counterpart to `tf.reduce_max()`. In particular, this Op also returns a dense `Tensor` instead of a sparse one. Note: A gradient is not defined for this function, so it can't be used in training models that need gradient descent. Reduces `sp_input` along the dimensions given in `reduction_axes`. Unless `keepdims` is true, the rank of the tensor is reduced by 1 for each entry in `reduction_axes`. If `keepdims` is true, the reduced dimensions are retained with length 1. If `reduction_axes` has no entries, all dimensions are reduced, and a tensor with a single element is returned. Additionally, the axes can be negative, similar to the indexing rules in Python. The values not defined in `sp_input` don't participate in the reduce max, as opposed to be implicitly assumed 0 -- hence it can return negative values for sparse `reduction_axes`. But, in case there are no values in `reduction_axes`, it will reduce to 0. See second example below. For example: ```python # 'x' represents [[1, ?, 2] # [?, 3, ?]] # where ? is implicitly-zero. tf.sparse.reduce_max(x) ==> 3 tf.sparse.reduce_max(x, 0) ==> [1, 3, 2] tf.sparse.reduce_max(x, 1) ==> [2, 3] # Can also use -1 as the axis. tf.sparse.reduce_max(x, 1, keepdims=True) ==> [[2], [3]] tf.sparse.reduce_max(x, [0, 1]) ==> 3 # 'y' represents [[-7, ?] # [ 4, 3] # [ ?, ?] tf.sparse.reduce_max(x, 1) ==> [-7, 4, 0] ``` Args: sp_input: The SparseTensor to reduce. Should have numeric type. axis: The dimensions to reduce; list or scalar. If `None` (the default), reduces all dimensions. keepdims: If true, retain reduced dimensions with length 1. reduction_axes: Deprecated name of `axis`. keep_dims: Deprecated alias for `keepdims`. Returns: The reduced Tensor. """ keepdims = deprecation.deprecated_argument_lookup("keepdims", keepdims, "keep_dims", keep_dims) axis = deprecation.deprecated_argument_lookup("axis", axis, "reduction_axes", reduction_axes) if keepdims is None: keepdims = False return gen_sparse_ops.sparse_reduce_max( sp_input.indices, sp_input.values, sp_input.dense_shape, math_ops._ReductionDims(sp_input, axis), keepdims) @tf_export(v1=["sparse.reduce_max_sparse", "sparse_reduce_max_sparse"]) @deprecation.deprecated_endpoints("sparse_reduce_max_sparse") @deprecation.deprecated_args( None, "keep_dims is deprecated, use keepdims instead", "keep_dims") def sparse_reduce_max_sparse(sp_input, axis=None, keepdims=None, reduction_axes=None, keep_dims=None): """Computes the max of elements across dimensions of a SparseTensor. This Op takes a SparseTensor and is the sparse counterpart to `tf.reduce_max()`. In contrast to SparseReduceSum, this Op returns a SparseTensor. Note: A gradient is not defined for this function, so it can't be used in training models that need gradient descent. Reduces `sp_input` along the dimensions given in `reduction_axes`. Unless `keepdims` is true, the rank of the tensor is reduced by 1 for each entry in `reduction_axes`. If `keepdims` is true, the reduced dimensions are retained with length 1. If `reduction_axes` has no entries, all dimensions are reduced, and a tensor with a single element is returned. Additionally, the axes can be negative, which are interpreted according to the indexing rules in Python. Args: sp_input: The SparseTensor to reduce. Should have numeric type. axis: The dimensions to reduce; list or scalar. If `None` (the default), reduces all dimensions. keepdims: If true, retain reduced dimensions with length 1. reduction_axes: Deprecated name of axis. keep_dims: Deprecated alias for `keepdims`. Returns: The reduced SparseTensor. """ keepdims = deprecation.deprecated_argument_lookup("keepdims", keepdims, "keep_dims", keep_dims) axis = deprecation.deprecated_argument_lookup("axis", axis, "reduction_axes", reduction_axes) if keepdims is None: keepdims = False output_ind, output_val, output_shape = ( gen_sparse_ops.sparse_reduce_max_sparse( sp_input.indices, sp_input.values, sp_input.dense_shape, math_ops._ReductionDims(sp_input, axis), keepdims)) return sparse_tensor.SparseTensor(output_ind, output_val, output_shape) @tf_export("sparse.reduce_sum", v1=[]) def sparse_reduce_sum_v2( sp_input, axis=None, keepdims=None, output_is_sparse=False, name=None): """Computes the sum of elements across dimensions of a SparseTensor. This Op takes a SparseTensor and is the sparse counterpart to `tf.reduce_sum()`. In particular, this Op also returns a dense `Tensor` if `output_is_sparse` is `False`, or a `SparseTensor` if `output_is_sparse` is `True`. Note: if `output_is_sparse` is True, a gradient is not defined for this function, so it can't be used in training models that need gradient descent. Reduces `sp_input` along the dimensions given in `axis`. Unless `keepdims` is true, the rank of the tensor is reduced by 1 for each entry in `axis`. If `keepdims` is true, the reduced dimensions are retained with length 1. If `axis` has no entries, all dimensions are reduced, and a tensor with a single element is returned. Additionally, the axes can be negative, similar to the indexing rules in Python. For example: ```python # 'x' represents [[1, ?, 1] # [?, 1, ?]] # where ? is implicitly-zero. tf.sparse.reduce_sum(x) ==> 3 tf.sparse.reduce_sum(x, 0) ==> [1, 1, 1] tf.sparse.reduce_sum(x, 1) ==> [2, 1] # Can also use -1 as the axis. tf.sparse.reduce_sum(x, 1, keepdims=True) ==> [[2], [1]] tf.sparse.reduce_sum(x, [0, 1]) ==> 3 ``` Args: sp_input: The SparseTensor to reduce. Should have numeric type. axis: The dimensions to reduce; list or scalar. If `None` (the default), reduces all dimensions. keepdims: If true, retain reduced dimensions with length 1. output_is_sparse: If true, returns a `SparseTensor` instead of a dense `Tensor` (the default). name: A name for the operation (optional). Returns: The reduced Tensor or the reduced SparseTensor if `output_is_sparse` is True. """ if keepdims is None: keepdims = False if output_is_sparse: output_ind, output_val, output_shape = ( gen_sparse_ops.sparse_reduce_sum_sparse( sp_input.indices, sp_input.values, sp_input.dense_shape, math_ops._ReductionDims(sp_input, axis), keepdims, name=name)) return sparse_tensor.SparseTensor(output_ind, output_val, output_shape) return gen_sparse_ops.sparse_reduce_sum( sp_input.indices, sp_input.values, sp_input.dense_shape, math_ops._ReductionDims(sp_input, axis), keepdims, name=name) @tf_export(v1=["sparse.reduce_sum", "sparse_reduce_sum"]) @deprecation.deprecated_endpoints("sparse_reduce_sum") @deprecation.deprecated_args( None, "keep_dims is deprecated, use keepdims instead", "keep_dims") @deprecation.deprecated_args( None, "reduction_axes is deprecated, use axis instead", "reduction_axes") def sparse_reduce_sum(sp_input, axis=None, keepdims=None, reduction_axes=None, keep_dims=None): """Computes the sum of elements across dimensions of a SparseTensor. This Op takes a SparseTensor and is the sparse counterpart to `tf.reduce_sum()`. In particular, this Op also returns a dense `Tensor` instead of a sparse one. Reduces `sp_input` along the dimensions given in `reduction_axes`. Unless `keepdims` is true, the rank of the tensor is reduced by 1 for each entry in `reduction_axes`. If `keepdims` is true, the reduced dimensions are retained with length 1. If `reduction_axes` has no entries, all dimensions are reduced, and a tensor with a single element is returned. Additionally, the axes can be negative, similar to the indexing rules in Python. For example: ```python # 'x' represents [[1, ?, 1] # [?, 1, ?]] # where ? is implicitly-zero. tf.sparse.reduce_sum(x) ==> 3 tf.sparse.reduce_sum(x, 0) ==> [1, 1, 1] tf.sparse.reduce_sum(x, 1) ==> [2, 1] # Can also use -1 as the axis. tf.sparse.reduce_sum(x, 1, keepdims=True) ==> [[2], [1]] tf.sparse.reduce_sum(x, [0, 1]) ==> 3 ``` Args: sp_input: The SparseTensor to reduce. Should have numeric type. axis: The dimensions to reduce; list or scalar. If `None` (the default), reduces all dimensions. keepdims: If true, retain reduced dimensions with length 1. reduction_axes: Deprecated name of `axis`. keep_dims: Deprecated alias for `keepdims`. Returns: The reduced Tensor. """ keepdims = deprecation.deprecated_argument_lookup("keepdims", keepdims, "keep_dims", keep_dims) axis = deprecation.deprecated_argument_lookup("axis", axis, "reduction_axes", reduction_axes) if keepdims is None: keepdims = False return gen_sparse_ops.sparse_reduce_sum( sp_input.indices, sp_input.values, sp_input.dense_shape, math_ops._ReductionDims(sp_input, axis), keepdims) @tf_export(v1=["sparse.reduce_sum_sparse", "sparse_reduce_sum_sparse"]) @deprecation.deprecated_endpoints("sparse_reduce_sum_sparse") @deprecation.deprecated_args( None, "keep_dims is deprecated, use keepdims instead", "keep_dims") def sparse_reduce_sum_sparse(sp_input, axis=None, keepdims=None, reduction_axes=None, keep_dims=None): """Computes the sum of elements across dimensions of a SparseTensor. This Op takes a SparseTensor and is the sparse counterpart to `tf.reduce_sum()`. In contrast to SparseReduceSum, this Op returns a SparseTensor. Note: A gradient is not defined for this function, so it can't be used in training models that need gradient descent. Reduces `sp_input` along the dimensions given in `reduction_axes`. Unless `keepdims` is true, the rank of the tensor is reduced by 1 for each entry in `reduction_axes`. If `keepdims` is true, the reduced dimensions are retained with length 1. If `reduction_axes` has no entries, all dimensions are reduced, and a tensor with a single element is returned. Additionally, the axes can be negative, which are interpreted according to the indexing rules in Python. Args: sp_input: The SparseTensor to reduce. Should have numeric type. axis: The dimensions to reduce; list or scalar. If `None` (the default), reduces all dimensions. keepdims: If true, retain reduced dimensions with length 1. reduction_axes: Deprecated name of axis. keep_dims: Deprecated alias for `keepdims`. Returns: The reduced SparseTensor. """ keepdims = deprecation.deprecated_argument_lookup("keepdims", keepdims, "keep_dims", keep_dims) axis = deprecation.deprecated_argument_lookup("axis", axis, "reduction_axes", reduction_axes) if keepdims is None: keepdims = False output_ind, output_val, output_shape = ( gen_sparse_ops.sparse_reduce_sum_sparse( sp_input.indices, sp_input.values, sp_input.dense_shape, math_ops._ReductionDims(sp_input, axis), keepdims)) return sparse_tensor.SparseTensor(output_ind, output_val, output_shape) @tf_export("sparse.to_dense", v1=["sparse.to_dense", "sparse_tensor_to_dense"]) @deprecation.deprecated_endpoints("sparse_tensor_to_dense") def sparse_tensor_to_dense(sp_input, default_value=None, validate_indices=True, name=None): """Converts a `SparseTensor` into a dense tensor. This op is a convenience wrapper around `sparse_to_dense` for `SparseTensor`s. For example, if `sp_input` has shape `[3, 5]` and non-empty string values: [0, 1]: a [0, 3]: b [2, 0]: c and `default_value` is `x`, then the output will be a dense `[3, 5]` string tensor with values: [[x a x b x] [x x x x x] [c x x x x]] Indices must be without repeats. This is only tested if `validate_indices` is `True`. Args: sp_input: The input `SparseTensor`. default_value: Scalar value to set for indices not specified in `sp_input`. Defaults to zero. validate_indices: A boolean value. If `True`, indices are checked to make sure they are sorted in lexicographic order and that there are no repeats. name: A name prefix for the returned tensors (optional). Returns: A dense tensor with shape `sp_input.dense_shape` and values specified by the non-empty values in `sp_input`. Indices not in `sp_input` are assigned `default_value`. Raises: TypeError: If `sp_input` is not a `SparseTensor`. """ sp_input = _convert_to_sparse_tensor(sp_input) if default_value is None: default_value = array_ops.zeros([], dtype=sp_input.dtype) return gen_sparse_ops.sparse_to_dense( sp_input.indices, sp_input.dense_shape, sp_input.values, default_value=default_value, validate_indices=validate_indices, name=name) @tf_export( "sparse.to_indicator", v1=["sparse.to_indicator", "sparse_to_indicator"]) @deprecation.deprecated_endpoints("sparse_to_indicator") def sparse_to_indicator(sp_input, vocab_size, name=None): """Converts a `SparseTensor` of ids into a dense bool indicator tensor. The last dimension of `sp_input.indices` is discarded and replaced with the values of `sp_input`. If `sp_input.dense_shape = [D0, D1, ..., Dn, K]`, then `output.shape = [D0, D1, ..., Dn, vocab_size]`, where output[d_0, d_1, ..., d_n, sp_input[d_0, d_1, ..., d_n, k]] = True and False elsewhere in `output`. For example, if `sp_input.dense_shape = [2, 3, 4]` with non-empty values: [0, 0, 0]: 0 [0, 1, 0]: 10 [1, 0, 3]: 103 [1, 1, 1]: 150 [1, 1, 2]: 149 [1, 1, 3]: 150 [1, 2, 1]: 121 and `vocab_size = 200`, then the output will be a `[2, 3, 200]` dense bool tensor with False everywhere except at positions (0, 0, 0), (0, 1, 10), (1, 0, 103), (1, 1, 149), (1, 1, 150), (1, 2, 121). Note that repeats are allowed in the input SparseTensor. This op is useful for converting `SparseTensor`s into dense formats for compatibility with ops that expect dense tensors. The input `SparseTensor` must be in row-major order. Args: sp_input: A `SparseTensor` with `values` property of type `int32` or `int64`. vocab_size: A scalar int64 Tensor (or Python int) containing the new size of the last dimension, `all(0 <= sp_input.values < vocab_size)`. name: A name prefix for the returned tensors (optional) Returns: A dense bool indicator tensor representing the indices with specified value. Raises: TypeError: If `sp_input` is not a `SparseTensor`. """ sp_input = _convert_to_sparse_tensor(sp_input) with ops.name_scope(name, "SparseToIndicator", [sp_input]) as name: num_entries = array_ops.shape(sp_input.indices)[0] new_values = array_ops.fill(array_ops.expand_dims(num_entries, 0), True) sp_values = sparse_tensor.SparseTensor(sp_input.indices, new_values, sp_input.dense_shape) sp_new = sparse_merge_impl(sp_input, sp_values, vocab_size, name) # validate_indices may be False because we allow duplicates in new_indices: # repeated indices are allowed when creating an indicator matrix. return sparse_tensor_to_dense( sp_new, default_value=False, validate_indices=False, name=name) @tf_export(v1=["sparse.merge", "sparse_merge"]) @deprecation.deprecated(None, "No similar op available at this time.") def sparse_merge(sp_ids, sp_values, vocab_size, name=None, already_sorted=False): """Combines a batch of feature ids and values into a single `SparseTensor`. The most common use case for this function occurs when feature ids and their corresponding values are stored in `Example` protos on disk. `parse_example` will return a batch of ids and a batch of values, and this function joins them into a single logical `SparseTensor` for use in functions such as `sparse_tensor_dense_matmul`, `sparse_to_dense`, etc. The `SparseTensor` returned by this function has the following properties: - `indices` is equivalent to `sp_ids.indices` with the last dimension discarded and replaced with `sp_ids.values`. - `values` is simply `sp_values.values`. - If `sp_ids.dense_shape = [D0, D1, ..., Dn, K]`, then `output.shape = [D0, D1, ..., Dn, vocab_size]`. For example, consider the following feature vectors: ```python vector1 = [-3, 0, 0, 0, 0, 0] vector2 = [ 0, 1, 0, 4, 1, 0] vector3 = [ 5, 0, 0, 9, 0, 0] ``` These might be stored sparsely in the following Example protos by storing only the feature ids (column number if the vectors are treated as a matrix) of the non-zero elements and the corresponding values: ```python examples = [Example(features={ "ids": Feature(int64_list=Int64List(value=[0])), "values": Feature(float_list=FloatList(value=[-3]))}), Example(features={ "ids": Feature(int64_list=Int64List(value=[1, 4, 3])), "values": Feature(float_list=FloatList(value=[1, 1, 4]))}), Example(features={ "ids": Feature(int64_list=Int64List(value=[0, 3])), "values": Feature(float_list=FloatList(value=[5, 9]))})] ``` The result of calling parse_example on these examples will produce a dictionary with entries for "ids" and "values". Passing those two objects to this function along with vocab_size=6, will produce a `SparseTensor` that sparsely represents all three instances. Namely, the `indices` property will contain the coordinates of the non-zero entries in the feature matrix (the first dimension is the row number in the matrix, i.e., the index within the batch, and the second dimension is the column number, i.e., the feature id); `values` will contain the actual values. `shape` will be the shape of the original matrix, i.e., (3, 6). For our example above, the output will be equal to: ```python SparseTensor(indices=[[0, 0], [1, 1], [1, 3], [1, 4], [2, 0], [2, 3]], values=[-3, 1, 4, 1, 5, 9], dense_shape=[3, 6]) ``` This method generalizes to higher-dimensions by simply providing a list for both the sp_ids as well as the vocab_size. In this case the resulting `SparseTensor` has the following properties: - `indices` is equivalent to `sp_ids[0].indices` with the last dimension discarded and concatenated with `sp_ids[0].values, sp_ids[1].values, ...`. - `values` is simply `sp_values.values`. - If `sp_ids.dense_shape = [D0, D1, ..., Dn, K]`, then `output.shape = [D0, D1, ..., Dn] + vocab_size`. Args: sp_ids: A single `SparseTensor` with `values` property of type `int32` or `int64` or a Python list of such `SparseTensor`s or a list thereof. sp_values: A `SparseTensor` of any type. vocab_size: A scalar `int64` Tensor (or Python int) containing the new size of the last dimension, `all(0 <= sp_ids.values < vocab_size)`. Or a list thereof with `all(0 <= sp_ids[i].values < vocab_size[i])` for all `i`. name: A name prefix for the returned tensors (optional) already_sorted: A boolean to specify whether the per-batch values in `sp_values` are already sorted. If so skip sorting, False by default (optional). Returns: A `SparseTensor` compactly representing a batch of feature ids and values, useful for passing to functions that expect such a `SparseTensor`. Raises: TypeError: If `sp_values` is not a `SparseTensor`. Or if `sp_ids` is neither a `SparseTensor` nor a list thereof. Or if `vocab_size` is not a `Tensor` or a Python int and `sp_ids` is a `SparseTensor`. Or if `vocab_size` is not a or list thereof and `sp_ids` is a list. ValueError: If `sp_ids` and `vocab_size` are lists of different lengths. """ return sparse_merge_impl(sp_ids, sp_values, vocab_size, name, already_sorted) def sparse_merge_impl(sp_ids, sp_values, vocab_size, name=None, already_sorted=False): """Internal implementation for sparse_merge to avoid deprecation warnings.""" if isinstance(sp_ids, sparse_tensor.SparseTensorValue) or isinstance( sp_ids, sparse_tensor.SparseTensor): sp_ids = [sp_ids] if not (isinstance(vocab_size, ops.Tensor) or isinstance(vocab_size, numbers.Integral)): raise TypeError("vocab_size has to be a Tensor or Python int. Found %s" % type(vocab_size)) vocab_size = [vocab_size] else: if not isinstance(sp_ids, collections_abc.Iterable): raise TypeError("sp_ids has to be a SparseTensor or list thereof. " "Found %s" % type(sp_ids)) if not isinstance(vocab_size, collections_abc.Iterable): raise TypeError("vocab_size has to be a list of Tensors or Python ints. " "Found %s" % type(vocab_size)) for dim in vocab_size: if not (isinstance(dim, ops.Tensor) or isinstance(dim, numbers.Integral)): raise TypeError( "vocab_size has to be a list of Tensors or Python ints. Found %s" % type(dim)) if len(sp_ids) != len(vocab_size): raise ValueError("sp_ids and vocab_size have to have equal lengths.") with ops.name_scope(name, "SparseMerge", [sp_ids, sp_values]): sp_ids = [_convert_to_sparse_tensor(sp_ids_dim) for sp_ids_dim in sp_ids] sp_values = _convert_to_sparse_tensor(sp_values) ids = [] for sp_ids_dim in sp_ids: ids_dim = sp_ids_dim.values if sp_ids_dim.dtype != dtypes.int64: ids_dim = math_ops.cast(ids_dim, dtypes.int64) ids += [array_ops.expand_dims(ids_dim, axis=1)] vocab_size = [math_ops.cast(x, dtypes.int64) for x in vocab_size] # Slice off the last dimension of indices, then tack on the ids indices_columns_to_preserve = sp_ids[0].indices[:, :-1] new_indices = array_ops.concat([indices_columns_to_preserve] + ids, 1) new_values = sp_values.values new_shape = array_ops.concat([sp_ids[0].dense_shape[:-1], vocab_size], 0) result = sparse_tensor.SparseTensor(new_indices, new_values, new_shape) if already_sorted: return result sorted_result = sparse_reorder(result) return sparse_tensor.SparseTensor( sorted_result.indices, sorted_result.values, new_shape) @tf_export("sparse.retain", v1=["sparse.retain", "sparse_retain"]) @deprecation.deprecated_endpoints("sparse_retain") def sparse_retain(sp_input, to_retain): """Retains specified non-empty values within a `SparseTensor`. For example, if `sp_input` has shape `[4, 5]` and 4 non-empty string values: [0, 1]: a [0, 3]: b [2, 0]: c [3, 1]: d and `to_retain = [True, False, False, True]`, then the output will be a `SparseTensor` of shape `[4, 5]` with 2 non-empty values: [0, 1]: a [3, 1]: d Args: sp_input: The input `SparseTensor` with `N` non-empty elements. to_retain: A bool vector of length `N` with `M` true values. Returns: A `SparseTensor` with the same shape as the input and `M` non-empty elements corresponding to the true positions in `to_retain`. Raises: TypeError: If `sp_input` is not a `SparseTensor`. """ sp_input = _convert_to_sparse_tensor(sp_input) to_retain = ops.convert_to_tensor(to_retain) # Shape checking, if shape is known at graph construction time retain_shape = to_retain.get_shape() retain_shape.assert_has_rank(1) if sp_input.values.get_shape().dims is not None: sp_input.values.get_shape().dims[0].merge_with( tensor_shape.dimension_at_index(retain_shape, 0)) where_true = array_ops.reshape(array_ops.where_v2(to_retain), [-1]) new_indices = array_ops.gather(sp_input.indices, where_true) new_values = array_ops.gather(sp_input.values, where_true) return sparse_tensor.SparseTensor(new_indices, new_values, array_ops.identity(sp_input.dense_shape)) @tf_export( "sparse.reset_shape", v1=["sparse.reset_shape", "sparse_reset_shape"]) @deprecation.deprecated_endpoints("sparse_reset_shape") def sparse_reset_shape(sp_input, new_shape=None): """Resets the shape of a `SparseTensor` with indices and values unchanged. If `new_shape` is None, returns a copy of `sp_input` with its shape reset to the tight bounding box of `sp_input`. This will be a shape consisting of all zeros if sp_input has no values. If `new_shape` is provided, then it must be larger or equal in all dimensions compared to the shape of `sp_input`. When this condition is met, the returned SparseTensor will have its shape reset to `new_shape` and its indices and values unchanged from that of `sp_input.` For example: Consider a `sp_input` with shape [2, 3, 5]: [0, 0, 1]: a [0, 1, 0]: b [0, 2, 2]: c [1, 0, 3]: d - It is an error to set `new_shape` as [3, 7] since this represents a rank-2 tensor while `sp_input` is rank-3. This is either a ValueError during graph construction (if both shapes are known) or an OpError during run time. - Setting `new_shape` as [2, 3, 6] will be fine as this shape is larger or equal in every dimension compared to the original shape [2, 3, 5]. - On the other hand, setting new_shape as [2, 3, 4] is also an error: The third dimension is smaller than the original shape [2, 3, 5] (and an `InvalidArgumentError` will be raised). - If `new_shape` is None, the returned SparseTensor will have a shape [2, 3, 4], which is the tight bounding box of `sp_input`. Args: sp_input: The input `SparseTensor`. new_shape: None or a vector representing the new shape for the returned `SparseTensor`. Returns: A `SparseTensor` indices and values unchanged from `input_sp`. Its shape is `new_shape` if that is set. Otherwise it is the tight bounding box of `input_sp` Raises: TypeError: If `sp_input` is not a `SparseTensor`. ValueError: If `new_shape` represents a tensor with a different rank from that of `sp_input` (if shapes are known when graph is constructed). ValueError: If `new_shape` is determined during graph build to have dimension sizes that are too small. OpError: - If `new_shape` has dimension sizes that are too small. - If shapes are not known during graph construction time, and during run time it is found out that the ranks do not match. """ sp_input = _convert_to_sparse_tensor(sp_input) in_indices = array_ops.identity(sp_input.indices) in_values = array_ops.identity(sp_input.values) in_shape = array_ops.identity(sp_input.dense_shape) if new_shape is None: dim_low_bound = math_ops.reduce_max(in_indices, axis=0) output_shape_tensor = math_ops.maximum( array_ops.constant(0, dtype=dtypes.int64), math_ops.add(dim_low_bound, array_ops.ones_like(in_shape))) else: output_shape_tensor = ops.convert_to_tensor(new_shape) output_shape_tensor.get_shape().assert_has_rank(1) output_shape_tensor = math_ops.cast(output_shape_tensor, dtypes.int64) # For cases when shape is known during graph construction, this catches the # error before the sparse_tensor.SparseTensor catches it. if output_shape_tensor.get_shape().rank is not None: output_shape_tensor.get_shape().dims[0].merge_with( in_shape.get_shape().dims[0]) output_shape_tensor_const = tensor_util.constant_value(output_shape_tensor) # For cases where all shapes are known during graph construction if (output_shape_tensor_const is not None and sp_input.get_shape().is_fully_defined()): in_shape_const = np.array(sp_input.get_shape().as_list()) if not np.all(in_shape_const <= output_shape_tensor_const): raise ValueError( "Requested new_shape should have dimension sizes >= sp_input.shape." " Found new_shape (%s), sp_input.shape (%s)." % (in_shape_const, output_shape_tensor_const)) output_shape_tensor = output_shape_tensor_const else: # For cases where shape is not known during graph construction. output_shape_tensor = control_flow_ops.with_dependencies([ check_ops.assert_equal( array_ops.shape(in_shape), array_ops.shape(output_shape_tensor)) ], output_shape_tensor) output_shape_tensor = control_flow_ops.with_dependencies( [check_ops.assert_less_equal(in_shape, output_shape_tensor)], output_shape_tensor) return sparse_tensor.SparseTensor(in_indices, in_values, output_shape_tensor) @tf_export( "sparse.fill_empty_rows", v1=["sparse.fill_empty_rows", "sparse_fill_empty_rows"]) @deprecation.deprecated_endpoints("sparse_fill_empty_rows") def sparse_fill_empty_rows(sp_input, default_value, name=None): """Fills empty rows in the input 2-D `SparseTensor` with a default value. This op adds entries with the specified `default_value` at index `[row, 0]` for any row in the input that does not already have a value. For example, suppose `sp_input` has shape `[5, 6]` and non-empty values: [0, 1]: a [0, 3]: b [2, 0]: c [3, 1]: d Rows 1 and 4 are empty, so the output will be of shape `[5, 6]` with values: [0, 1]: a [0, 3]: b [1, 0]: default_value [2, 0]: c [3, 1]: d [4, 0]: default_value Note that the input may have empty columns at the end, with no effect on this op. The output `SparseTensor` will be in row-major order and will have the same shape as the input. This op also returns an indicator vector such that empty_row_indicator[i] = True iff row i was an empty row. Args: sp_input: A `SparseTensor` with shape `[N, M]`. default_value: The value to fill for empty rows, with the same type as `sp_input.` name: A name prefix for the returned tensors (optional) Returns: sp_ordered_output: A `SparseTensor` with shape `[N, M]`, and with all empty rows filled in with `default_value`. empty_row_indicator: A bool vector of length `N` indicating whether each input row was empty. Raises: TypeError: If `sp_input` is not a `SparseTensor`. """ sp_input = _convert_to_sparse_tensor(sp_input) with ops.name_scope(name, "SparseFillEmptyRows", [sp_input]): default_value = ops.convert_to_tensor( default_value, dtype=sp_input.values.dtype) (output_indices, output_values, empty_row_indicator, unused_reverse_index_map) = gen_sparse_ops.sparse_fill_empty_rows( indices=sp_input.indices, values=sp_input.values, dense_shape=sp_input.dense_shape, default_value=default_value) return (sparse_tensor.SparseTensor( indices=output_indices, values=output_values, dense_shape=sp_input.dense_shape), empty_row_indicator) @tf_export(v1=["io.serialize_sparse", "serialize_sparse"]) @dispatch.add_dispatch_support @deprecation.deprecated_endpoints("serialize_sparse") def serialize_sparse(sp_input, name=None, out_type=dtypes.string): """Serialize a `SparseTensor` into a 3-vector (1-D `Tensor`) object. Args: sp_input: The input `SparseTensor`. name: A name prefix for the returned tensors (optional). out_type: The `dtype` to use for serialization. Returns: A 3-vector (1-D `Tensor`), with each column representing the serialized `SparseTensor`'s indices, values, and shape (respectively). Raises: TypeError: If `sp_input` is not a `SparseTensor`. """ return serialize_sparse_v2(sp_input, out_type, name) @tf_export("io.serialize_sparse", v1=[]) @dispatch.add_dispatch_support def serialize_sparse_v2(sp_input, out_type=dtypes.string, name=None): """Serialize a `SparseTensor` into a 3-vector (1-D `Tensor`) object. Args: sp_input: The input `SparseTensor`. out_type: The `dtype` to use for serialization. name: A name prefix for the returned tensors (optional). Returns: A 3-vector (1-D `Tensor`), with each column representing the serialized `SparseTensor`'s indices, values, and shape (respectively). Raises: TypeError: If `sp_input` is not a `SparseTensor`. """ sp_input = _convert_to_sparse_tensor(sp_input) return gen_sparse_ops.serialize_sparse( sp_input.indices, sp_input.values, sp_input.dense_shape, name=name, out_type=out_type) @tf_export(v1=["io.serialize_many_sparse", "serialize_many_sparse"]) @dispatch.add_dispatch_support @deprecation.deprecated_endpoints("serialize_many_sparse") def serialize_many_sparse(sp_input, name=None, out_type=dtypes.string): """Serialize `N`-minibatch `SparseTensor` into an `[N, 3]` `Tensor`. The `SparseTensor` must have rank `R` greater than 1, and the first dimension is treated as the minibatch dimension. Elements of the `SparseTensor` must be sorted in increasing order of this first dimension. The serialized `SparseTensor` objects going into each row of the output `Tensor` will have rank `R-1`. The minibatch size `N` is extracted from `sparse_shape[0]`. Args: sp_input: The input rank `R` `SparseTensor`. name: A name prefix for the returned tensors (optional). out_type: The `dtype` to use for serialization. Returns: A matrix (2-D `Tensor`) with `N` rows and `3` columns. Each column represents serialized `SparseTensor`'s indices, values, and shape (respectively). Raises: TypeError: If `sp_input` is not a `SparseTensor`. """ return serialize_many_sparse_v2(sp_input, out_type, name) @tf_export("io.serialize_many_sparse", v1=[]) @dispatch.add_dispatch_support def serialize_many_sparse_v2(sp_input, out_type=dtypes.string, name=None): """Serialize `N`-minibatch `SparseTensor` into an `[N, 3]` `Tensor`. The `SparseTensor` must have rank `R` greater than 1, and the first dimension is treated as the minibatch dimension. Elements of the `SparseTensor` must be sorted in increasing order of this first dimension. The serialized `SparseTensor` objects going into each row of the output `Tensor` will have rank `R-1`. The minibatch size `N` is extracted from `sparse_shape[0]`. Args: sp_input: The input rank `R` `SparseTensor`. out_type: The `dtype` to use for serialization. name: A name prefix for the returned tensors (optional). Returns: A matrix (2-D `Tensor`) with `N` rows and `3` columns. Each column represents serialized `SparseTensor`'s indices, values, and shape (respectively). Raises: TypeError: If `sp_input` is not a `SparseTensor`. """ sp_input = _convert_to_sparse_tensor(sp_input) return gen_sparse_ops.serialize_many_sparse( sp_input.indices, sp_input.values, sp_input.dense_shape, name=name, out_type=out_type) def deserialize_sparse(serialized_sparse, dtype, rank=None, name=None): """Deserialize `SparseTensor` objects. The input `serialized_sparse` must have the shape `[?, ?, ..., ?, 3]` where the last dimension stores serialized `SparseTensor` objects and the other N dimensions (N >= 0) correspond to a batch. The ranks of the original `SparseTensor` objects must all match. When the final `SparseTensor` is created, its rank is the rank of the incoming `SparseTensor` objects plus N; the sparse tensors have been concatenated along new dimensions, one for each batch. The output `SparseTensor` object's shape values for the original dimensions are the max across the input `SparseTensor` objects' shape values for the corresponding dimensions. The new dimensions match the size of the batch. The input `SparseTensor` objects' indices are assumed ordered in standard lexicographic order. If this is not the case, after this step run `SparseReorder` to restore index ordering. For example, if the serialized input is a `[2 x 3]` matrix representing two original `SparseTensor` objects: index = [ 0] [10] [20] values = [1, 2, 3] shape = [50] and index = [ 2] [10] values = [4, 5] shape = [30] then the final deserialized `SparseTensor` will be: index = [0 0] [0 10] [0 20] [1 2] [1 10] values = [1, 2, 3, 4, 5] shape = [2 50] Args: serialized_sparse: The serialized `SparseTensor` objects. The last dimension must have 3 columns. dtype: The `dtype` of the serialized `SparseTensor` objects. rank: (optional) Python int, the rank of the `SparseTensor` objects. name: A name prefix for the returned tensors (optional). Returns: A `SparseTensor` representing the deserialized `SparseTensor` objects. """ output_indices, output_values, output_shape = ( gen_sparse_ops.deserialize_sparse(serialized_sparse, dtype, name=name)) # Feed rank data back in, if available output_indices.set_shape([None, rank]) output_shape.set_shape([rank]) return sparse_tensor.SparseTensor(output_indices, output_values, output_shape) @tf_export( "io.deserialize_many_sparse", v1=["io.deserialize_many_sparse", "deserialize_many_sparse"]) @dispatch.add_dispatch_support @deprecation.deprecated_endpoints("deserialize_many_sparse") def deserialize_many_sparse(serialized_sparse, dtype, rank=None, name=None): """Deserialize and concatenate `SparseTensors` from a serialized minibatch. The input `serialized_sparse` must be a string matrix of shape `[N x 3]` where `N` is the minibatch size and the rows correspond to packed outputs of `serialize_sparse`. The ranks of the original `SparseTensor` objects must all match. When the final `SparseTensor` is created, it has rank one higher than the ranks of the incoming `SparseTensor` objects (they have been concatenated along a new row dimension). The output `SparseTensor` object's shape values for all dimensions but the first are the max across the input `SparseTensor` objects' shape values for the corresponding dimensions. Its first shape value is `N`, the minibatch size. The input `SparseTensor` objects' indices are assumed ordered in standard lexicographic order. If this is not the case, after this step run `sparse.reorder` to restore index ordering. For example, if the serialized input is a `[2, 3]` matrix representing two original `SparseTensor` objects: index = [ 0] [10] [20] values = [1, 2, 3] shape = [50] and index = [ 2] [10] values = [4, 5] shape = [30] then the final deserialized `SparseTensor` will be: index = [0 0] [0 10] [0 20] [1 2] [1 10] values = [1, 2, 3, 4, 5] shape = [2 50] Args: serialized_sparse: 2-D `Tensor` of type `string` of shape `[N, 3]`. The serialized and packed `SparseTensor` objects. dtype: The `dtype` of the serialized `SparseTensor` objects. rank: (optional) Python int, the rank of the `SparseTensor` objects. name: A name prefix for the returned tensors (optional) Returns: A `SparseTensor` representing the deserialized `SparseTensor`s, concatenated along the `SparseTensor`s' first dimension. All of the serialized `SparseTensor`s must have had the same rank and type. """ output_indices, output_values, output_shape = ( gen_sparse_ops.deserialize_many_sparse( serialized_sparse, dtype, name=name)) # Feed rank data back in, if available output_indices.set_shape([None, rank]) output_shape.set_shape([rank]) return sparse_tensor.SparseTensor(output_indices, output_values, output_shape) @tf_export("sparse.sparse_dense_matmul", v1=["sparse.sparse_dense_matmul", "sparse.matmul", "sparse_tensor_dense_matmul"]) @deprecation.deprecated_endpoints("sparse_tensor_dense_matmul") def sparse_tensor_dense_matmul(sp_a, b, adjoint_a=False, adjoint_b=False, name=None): # pylint: disable=line-too-long """Multiply SparseTensor (or dense Matrix) (of rank 2) "A" by dense matrix (or SparseTensor) "B". Please note that one and only one of the inputs MUST be a SparseTensor and the other MUST be a dense matrix. No validity checking is performed on the indices of `A`. However, the following input format is recommended for optimal behavior: * If `adjoint_a == false`: `A` should be sorted in lexicographically increasing order. Use `sparse.reorder` if you're not sure. * If `adjoint_a == true`: `A` should be sorted in order of increasing dimension 1 (i.e., "column major" order instead of "row major" order). Using `tf.nn.embedding_lookup_sparse` for sparse multiplication: It's not obvious but you can consider `embedding_lookup_sparse` as another sparse and dense multiplication. In some situations, you may prefer to use `embedding_lookup_sparse` even though you're not dealing with embeddings. There are two questions to ask in the decision process: Do you need gradients computed as sparse too? Is your sparse data represented as two `SparseTensor`s: ids and values? There is more explanation about data format below. If you answer any of these questions as yes, consider using `tf.nn.embedding_lookup_sparse`. Following explains differences between the expected SparseTensors: For example if dense form of your sparse data has shape `[3, 5]` and values: [[ a ] [b c] [ d ]] `SparseTensor` format expected by `sparse_tensor_dense_matmul`: `sp_a` (indices, values): [0, 1]: a [1, 0]: b [1, 4]: c [2, 2]: d `SparseTensor` format expected by `embedding_lookup_sparse`: `sp_ids` `sp_weights` [0, 0]: 1 [0, 0]: a [1, 0]: 0 [1, 0]: b [1, 1]: 4 [1, 1]: c [2, 0]: 2 [2, 0]: d Deciding when to use `sparse_tensor_dense_matmul` vs. `matmul`(a_is_sparse=True): There are a number of questions to ask in the decision process, including: * Will the SparseTensor `A` fit in memory if densified? * Is the column count of the product large (>> 1)? * Is the density of `A` larger than approximately 15%? If the answer to several of these questions is yes, consider converting the `SparseTensor` to a dense one and using `tf.matmul` with `a_is_sparse=True`. This operation tends to perform well when `A` is more sparse, if the column size of the product is small (e.g. matrix-vector multiplication), if `sp_a.dense_shape` takes on large values. Below is a rough speed comparison between `sparse_tensor_dense_matmul`, labeled 'sparse', and `matmul`(a_is_sparse=True), labeled 'dense'. For purposes of the comparison, the time spent converting from a `SparseTensor` to a dense `Tensor` is not included, so it is overly conservative with respect to the time ratio. Benchmark system: CPU: Intel Ivybridge with HyperThreading (6 cores) dL1:32KB dL2:256KB dL3:12MB GPU: NVidia Tesla k40c Compiled with: `-c opt --config=cuda --copt=-mavx` ``` tensorflow/python/sparse_tensor_dense_matmul_op_test --benchmarks A sparse [m, k] with % nonzero values between 1% and 80% B dense [k, n] % nnz n gpu m k dt(dense) dt(sparse) dt(sparse)/dt(dense) 0.01 1 True 100 100 0.000221166 0.00010154 0.459112 0.01 1 True 100 1000 0.00033858 0.000109275 0.322745 0.01 1 True 1000 100 0.000310557 9.85661e-05 0.317385 0.01 1 True 1000 1000 0.0008721 0.000100875 0.115669 0.01 1 False 100 100 0.000208085 0.000107603 0.51711 0.01 1 False 100 1000 0.000327112 9.51118e-05 0.290762 0.01 1 False 1000 100 0.000308222 0.00010345 0.335635 0.01 1 False 1000 1000 0.000865721 0.000101397 0.117124 0.01 10 True 100 100 0.000218522 0.000105537 0.482958 0.01 10 True 100 1000 0.000340882 0.000111641 0.327506 0.01 10 True 1000 100 0.000315472 0.000117376 0.372064 0.01 10 True 1000 1000 0.000905493 0.000123263 0.136128 0.01 10 False 100 100 0.000221529 9.82571e-05 0.44354 0.01 10 False 100 1000 0.000330552 0.000112615 0.340687 0.01 10 False 1000 100 0.000341277 0.000114097 0.334324 0.01 10 False 1000 1000 0.000819944 0.000120982 0.147549 0.01 25 True 100 100 0.000207806 0.000105977 0.509981 0.01 25 True 100 1000 0.000322879 0.00012921 0.400181 0.01 25 True 1000 100 0.00038262 0.00014158 0.370035 0.01 25 True 1000 1000 0.000865438 0.000202083 0.233504 0.01 25 False 100 100 0.000209401 0.000104696 0.499979 0.01 25 False 100 1000 0.000321161 0.000130737 0.407076 0.01 25 False 1000 100 0.000377012 0.000136801 0.362856 0.01 25 False 1000 1000 0.000861125 0.00020272 0.235413 0.2 1 True 100 100 0.000206952 9.69219e-05 0.46833 0.2 1 True 100 1000 0.000348674 0.000147475 0.422959 0.2 1 True 1000 100 0.000336908 0.00010122 0.300439 0.2 1 True 1000 1000 0.001022 0.000203274 0.198898 0.2 1 False 100 100 0.000207532 9.5412e-05 0.459746 0.2 1 False 100 1000 0.000356127 0.000146824 0.41228 0.2 1 False 1000 100 0.000322664 0.000100918 0.312764 0.2 1 False 1000 1000 0.000998987 0.000203442 0.203648 0.2 10 True 100 100 0.000211692 0.000109903 0.519165 0.2 10 True 100 1000 0.000372819 0.000164321 0.440753 0.2 10 True 1000 100 0.000338651 0.000144806 0.427596 0.2 10 True 1000 1000 0.00108312 0.000758876 0.70064 0.2 10 False 100 100 0.000215727 0.000110502 0.512231 0.2 10 False 100 1000 0.000375419 0.0001613 0.429653 0.2 10 False 1000 100 0.000336999 0.000145628 0.432132 0.2 10 False 1000 1000 0.00110502 0.000762043 0.689618 0.2 25 True 100 100 0.000218705 0.000129913 0.594009 0.2 25 True 100 1000 0.000394794 0.00029428 0.745402 0.2 25 True 1000 100 0.000404483 0.0002693 0.665788 0.2 25 True 1000 1000 0.0012002 0.00194494 1.62052 0.2 25 False 100 100 0.000221494 0.0001306 0.589632 0.2 25 False 100 1000 0.000396436 0.000297204 0.74969 0.2 25 False 1000 100 0.000409346 0.000270068 0.659754 0.2 25 False 1000 1000 0.00121051 0.00193737 1.60046 0.5 1 True 100 100 0.000214981 9.82111e-05 0.456836 0.5 1 True 100 1000 0.000415328 0.000223073 0.537101 0.5 1 True 1000 100 0.000358324 0.00011269 0.314492 0.5 1 True 1000 1000 0.00137612 0.000437401 0.317851 0.5 1 False 100 100 0.000224196 0.000101423 0.452386 0.5 1 False 100 1000 0.000400987 0.000223286 0.556841 0.5 1 False 1000 100 0.000368825 0.00011224 0.304318 0.5 1 False 1000 1000 0.00136036 0.000429369 0.31563 0.5 10 True 100 100 0.000222125 0.000112308 0.505608 0.5 10 True 100 1000 0.000461088 0.00032357 0.701753 0.5 10 True 1000 100 0.000394624 0.000225497 0.571422 0.5 10 True 1000 1000 0.00158027 0.00190898 1.20801 0.5 10 False 100 100 0.000232083 0.000114978 0.495418 0.5 10 False 100 1000 0.000454574 0.000324632 0.714146 0.5 10 False 1000 100 0.000379097 0.000227768 0.600817 0.5 10 False 1000 1000 0.00160292 0.00190168 1.18638 0.5 25 True 100 100 0.00023429 0.000151703 0.647501 0.5 25 True 100 1000 0.000497462 0.000598873 1.20386 0.5 25 True 1000 100 0.000460778 0.000557038 1.20891 0.5 25 True 1000 1000 0.00170036 0.00467336 2.74845 0.5 25 False 100 100 0.000228981 0.000155334 0.678371 0.5 25 False 100 1000 0.000496139 0.000620789 1.25124 0.5 25 False 1000 100 0.00045473 0.000551528 1.21287 0.5 25 False 1000 1000 0.00171793 0.00467152 2.71927 0.8 1 True 100 100 0.000222037 0.000105301 0.47425 0.8 1 True 100 1000 0.000410804 0.000329327 0.801664 0.8 1 True 1000 100 0.000349735 0.000131225 0.375212 0.8 1 True 1000 1000 0.00139219 0.000677065 0.48633 0.8 1 False 100 100 0.000214079 0.000107486 0.502085 0.8 1 False 100 1000 0.000413746 0.000323244 0.781261 0.8 1 False 1000 100 0.000348983 0.000131983 0.378193 0.8 1 False 1000 1000 0.00136296 0.000685325 0.50282 0.8 10 True 100 100 0.000229159 0.00011825 0.516017 0.8 10 True 100 1000 0.000498845 0.000532618 1.0677 0.8 10 True 1000 100 0.000383126 0.00029935 0.781336 0.8 10 True 1000 1000 0.00162866 0.00307312 1.88689 0.8 10 False 100 100 0.000230783 0.000124958 0.541452 0.8 10 False 100 1000 0.000493393 0.000550654 1.11606 0.8 10 False 1000 100 0.000377167 0.000298581 0.791642 0.8 10 False 1000 1000 0.00165795 0.00305103 1.84024 0.8 25 True 100 100 0.000233496 0.000175241 0.75051 0.8 25 True 100 1000 0.00055654 0.00102658 1.84458 0.8 25 True 1000 100 0.000463814 0.000783267 1.68875 0.8 25 True 1000 1000 0.00186905 0.00755344 4.04132 0.8 25 False 100 100 0.000240243 0.000175047 0.728625 0.8 25 False 100 1000 0.000578102 0.00104499 1.80763 0.8 25 False 1000 100 0.000485113 0.000776849 1.60138 0.8 25 False 1000 1000 0.00211448 0.00752736 3.55992 ``` Args: sp_a: SparseTensor (or dense Matrix) A, of rank 2. b: dense Matrix (or SparseTensor) B, with the same dtype as sp_a. adjoint_a: Use the adjoint of A in the matrix multiply. If A is complex, this is transpose(conj(A)). Otherwise it's transpose(A). adjoint_b: Use the adjoint of B in the matrix multiply. If B is complex, this is transpose(conj(B)). Otherwise it's transpose(B). name: A name prefix for the returned tensors (optional) Returns: A dense matrix (pseudo-code in dense np.matrix notation): `A = A.H if adjoint_a else A` `B = B.H if adjoint_b else B` `return A*B` """ # pylint: enable=line-too-long if isinstance(b, sparse_tensor.SparseTensor) \ or isinstance(b, sparse_tensor.SparseTensorValue): # We can do C * D where C is sparse but if we want to do A * B when # B is sparse we have to transpose. But AB = (B'A')' so we have to feed in # the transpose of the arguments as well. if adjoint_a != adjoint_b: return array_ops.transpose( sparse_tensor_dense_matmul(b, sp_a, adjoint_a, adjoint_b)) else: return array_ops.transpose( sparse_tensor_dense_matmul( b, sp_a, adjoint_a=not adjoint_a, adjoint_b=not adjoint_b)) else: sp_a = _convert_to_sparse_tensor(sp_a) with ops.name_scope(name, "SparseTensorDenseMatMul", [sp_a.indices, sp_a.values, b]) as name: b = ops.convert_to_tensor(b, name="b") return gen_sparse_ops.sparse_tensor_dense_mat_mul( a_indices=sp_a.indices, a_values=sp_a.values, a_shape=sp_a.dense_shape, b=b, adjoint_a=adjoint_a, adjoint_b=adjoint_b) @tf_export("sparse.softmax", v1=["sparse.softmax", "sparse_softmax"]) @deprecation.deprecated_endpoints("sparse_softmax") def sparse_softmax(sp_input, name=None): """Applies softmax to a batched N-D `SparseTensor`. The inputs represent an N-D SparseTensor with logical shape `[..., B, C]` (where `N >= 2`), and with indices sorted in the canonical lexicographic order. This op is equivalent to applying the normal `tf.nn.softmax()` to each innermost logical submatrix with shape `[B, C]`, but with the catch that *the implicitly zero elements do not participate*. Specifically, the algorithm is equivalent to: (1) Applies `tf.nn.softmax()` to a densified view of each innermost submatrix with shape `[B, C]`, along the size-C dimension; (2) Masks out the original implicitly-zero locations; (3) Renormalizes the remaining elements. Hence, the `SparseTensor` result has exactly the same non-zero indices and shape. Example: ```python # First batch: # [? e.] # [1. ? ] # Second batch: # [e ? ] # [e e ] shape = [2, 2, 2] # 3-D SparseTensor values = np.asarray([[[0., np.e], [1., 0.]], [[np.e, 0.], [np.e, np.e]]]) indices = np.vstack(np.where(values)).astype(np.int64).T result = tf.sparse.softmax(tf.sparse.SparseTensor(indices, values, shape)) # ...returning a 3-D SparseTensor, equivalent to: # [? 1.] [1 ?] # [1. ? ] and [.5 .5] # where ? means implicitly zero. ``` Args: sp_input: N-D `SparseTensor`, where `N >= 2`. name: optional name of the operation. Returns: output: N-D `SparseTensor` representing the results. """ with ops.name_scope(name, "SparseSoftmax", [sp_input.indices, sp_input.values]) as name: out_vals = gen_sparse_ops.sparse_softmax(sp_input.indices, sp_input.values, sp_input.dense_shape) return sparse_tensor.SparseTensor(sp_input.indices, out_vals, sp_input.dense_shape) @tf_export("sparse.maximum", v1=["sparse.maximum", "sparse_maximum"]) @deprecation.deprecated_endpoints("sparse_maximum") def sparse_maximum(sp_a, sp_b, name=None): """Returns the element-wise max of two SparseTensors. Assumes the two SparseTensors have the same shape, i.e., no broadcasting. Example: ```python sp_zero = sparse_tensor.SparseTensor([[0]], [0], [7]) sp_one = sparse_tensor.SparseTensor([[1]], [1], [7]) res = tf.sparse.maximum(sp_zero, sp_one).eval() # "res" should be equal to SparseTensor([[0], [1]], [0, 1], [7]). ``` Args: sp_a: a `SparseTensor` operand whose dtype is real, and indices lexicographically ordered. sp_b: the other `SparseTensor` operand with the same requirements (and the same shape). name: optional name of the operation. Returns: output: the output SparseTensor. """ with ops.name_scope( name, "SparseSparseMaximum", [sp_a.indices, sp_a.values, sp_b.indices, sp_b.values]) as name: out_indices, out_values = gen_sparse_ops.sparse_sparse_maximum( sp_a.indices, sp_a.values, sp_a.dense_shape, sp_b.indices, sp_b.values, sp_b.dense_shape, name=name) return sparse_tensor.SparseTensor(out_indices, out_values, sp_a.dense_shape) @tf_export("sparse.minimum", v1=["sparse.minimum", "sparse_minimum"]) @deprecation.deprecated_endpoints("sparse_minimum") def sparse_minimum(sp_a, sp_b, name=None): """Returns the element-wise min of two SparseTensors. Assumes the two SparseTensors have the same shape, i.e., no broadcasting. Example: ```python sp_zero = sparse_tensor.SparseTensor([[0]], [0], [7]) sp_one = sparse_tensor.SparseTensor([[1]], [1], [7]) res = tf.sparse.minimum(sp_zero, sp_one).eval() # "res" should be equal to SparseTensor([[0], [1]], [0, 0], [7]). ``` Args: sp_a: a `SparseTensor` operand whose dtype is real, and indices lexicographically ordered. sp_b: the other `SparseTensor` operand with the same requirements (and the same shape). name: optional name of the operation. Returns: output: the output SparseTensor. """ with ops.name_scope( name, "SparseSparseMinimum", [sp_a.indices, sp_a.values, sp_b.indices, sp_b.values]) as name: out_indices, out_values = gen_sparse_ops.sparse_sparse_minimum( sp_a.indices, sp_a.values, sp_a.dense_shape, sp_b.indices, sp_b.values, sp_b.dense_shape, name=name) return sparse_tensor.SparseTensor(out_indices, out_values, sp_a.dense_shape) @tf_export("sparse.transpose", v1=["sparse.transpose", "sparse_transpose"]) @deprecation.deprecated_endpoints("sparse_transpose") def sparse_transpose(sp_input, perm=None, name=None): """Transposes a `SparseTensor` The returned tensor's dimension i will correspond to the input dimension `perm[i]`. If `perm` is not given, it is set to (n-1...0), where n is the rank of the input tensor. Hence by default, this operation performs a regular matrix transpose on 2-D input Tensors. For example, if `sp_input` has shape `[4, 5]` and `indices` / `values`: [0, 3]: b [0, 1]: a [3, 1]: d [2, 0]: c then the output will be a `SparseTensor` of shape `[5, 4]` and `indices` / `values`: [0, 2]: c [1, 0]: a [1, 3]: d [3, 0]: b Args: sp_input: The input `SparseTensor`. perm: A permutation of the dimensions of `sp_input`. name: A name prefix for the returned tensors (optional) Returns: A transposed `SparseTensor`. Raises: TypeError: If `sp_input` is not a `SparseTensor`. """ with ops.name_scope(name, "SparseTranspose", [sp_input]) as name: if perm is None: if sp_input.shape.rank is not None: rank = sp_input.shape.rank perm = (rank - 1) - np.arange(0, rank, 1) else: rank = array_ops.rank(sp_input) perm = (rank - 1) - math_ops.range(0, rank, 1) indices = sp_input.indices transposed_indices = array_ops.transpose( array_ops.gather(array_ops.transpose(indices), perm)) perm_ = tensor_util.constant_value(ops.convert_to_tensor(perm)) if perm_ is not None and sp_input.get_shape().is_fully_defined(): old_shape_ = sp_input.get_shape().as_list() transposed_dense_shape = list(old_shape_) # Copy. for i, p in enumerate(perm_): transposed_dense_shape[i] = old_shape_[p] else: dense_shape = sp_input.dense_shape transposed_dense_shape = array_ops.gather(dense_shape, perm) transposed_st = sparse_tensor.SparseTensor( transposed_indices, sp_input.values, transposed_dense_shape) transposed_st = sparse_reorder(transposed_st) return transposed_st @tf_export("sparse.map_values", v1=[]) @dispatch.add_dispatch_support def map_values(op, *args, **kwargs): """Applies `op` to the `.values` tensor of one or more `SparseTensor`s. Replaces any `SparseTensor` in `args` or `kwargs` with its `values` tensor (which contains the non-default values for the SparseTensor), and then calls `op`. Returns a `SparseTensor` that is constructed from the input `SparseTensor`s' `indices`, `dense_shape`, and the value returned by the `op`. If the input arguments contain multiple `SparseTensor`s, then they must have equal `indices` and dense shapes. Examples: >>> s = tf.sparse.from_dense([[1, 2, 0], ... [0, 4, 0], ... [1, 0, 0]]) >>> tf.sparse.to_dense(tf.sparse.map_values(tf.ones_like, s)).numpy() array([[1, 1, 0], [0, 1, 0], [1, 0, 0]], dtype=int32) >>> tf.sparse.to_dense(tf.sparse.map_values(tf.multiply, s, s)).numpy() array([[ 1, 4, 0], [ 0, 16, 0], [ 1, 0, 0]], dtype=int32) >>> tf.sparse.to_dense(tf.sparse.map_values(tf.add, s, 5)).numpy() array([[6, 7, 0], [0, 9, 0], [6, 0, 0]], dtype=int32) Note: even though `tf.add(0, 5) != 0`, implicit zeros will remain unchanged. However, if the sparse tensor contains any explict zeros, these will be affected by the mapping! Args: op: The operation that should be applied to the SparseTensor `values`. `op` is typically an element-wise operation (such as math_ops.add), but any operation that preserves the shape can be used. *args: Arguments for `op`. **kwargs: Keyword arguments for `op`. Returns: A `SparseTensor` whose `indices` and `dense_shape` matches the `indices` and `dense_shape` of all input `SparseTensor`s. Raises: ValueError: If args contains no `SparseTensor`, or if the `indices` or `dense_shape`s of the input `SparseTensor`s are not equal. """ sparse_list = [] inner_args = _replace_sparse_with_values(args, sparse_list) inner_kwargs = _replace_sparse_with_values(kwargs, sparse_list) if not sparse_list: raise ValueError("No SparseTensor in argument list of map_values") with ops.control_dependencies(_assert_sparse_compatible(sparse_list)): # Delegate to op, and then compose the result from the transformed values # and the known indices/dense shape. Since we ensure that indices and shape # are identical, we can just use the first one. return sparse_tensor.SparseTensor(sparse_list[0].indices, op(*inner_args, **inner_kwargs), sparse_list[0].dense_shape) def _assert_sparse_compatible(sparse_tensors): """Check that all of `sparse_tensors` have same `indices` and `dense_shape`. Args: sparse_tensors: A list of sparse tensors. Returns: An op to be used as a control dependency. """ checks = [] first = sparse_tensors[0] for t in sparse_tensors[1:]: checks.append( check_ops.assert_equal( first.dense_shape, t.dense_shape, message="Mismatched shapes!")) checks.append( check_ops.assert_equal( first.indices, t.indices, message="Mismatched indices!")) return checks def _replace_sparse_with_values(value, sparse_list): """Replace `SparseTensor`s with their values in `value` Each `SparseTensor` in `value` is replaced by its `values` tensor, and collects all `SparseTensor`s in `sparse_list`. Args: value: A structure of `Tensor`s and `SparseTensor`s sparse_list: A list. Output parameter that collects all `SparseTensor`s in `value`. Returns: `value` with each SparseTensor replaced by its `.value` attribute. """ flat_vals = nest.flatten(value, expand_composites=False) new_vals = [] for v in flat_vals: if isinstance(v, sparse_tensor.SparseTensor): sparse_list.append(v) new_vals.append(v.values) else: new_vals.append(v) return nest.pack_sequence_as(value, new_vals, expand_composites=False) def _add_sparse_to_tensors_map(sp_input, container=None, shared_name=None, name=None): """Add a `SparseTensor` to a `SparseTensorsMap` and return its handle. Args: sp_input: The input `SparseTensor`. container: The container for the underlying `SparseTensorsMap` (optional). shared_name: The shared name for the underlying `SparseTensorsMap` (optional, defaults to the name of the newly created op). name: A name prefix for the returned tensors (optional). Returns: A string 1-vector (1D `Tensor`), with the single element representing the a unique handle to a `SparseTensor` stored by the `SparseTensorMap` underlying this op. Raises: TypeError: If `sp_input` is not a `SparseTensor`. """ sp_input = _convert_to_sparse_tensor(sp_input) return gen_sparse_ops.add_sparse_to_tensors_map( sp_input.indices, sp_input.values, sp_input.dense_shape, container=container, shared_name=shared_name, name=name) def _add_many_sparse_to_tensors_map(sp_input, container=None, shared_name=None, name=None): """Add a minibatch `SparseTensor` to a `SparseTensorsMap`, return `N` handles. The `SparseTensor` must have rank `R` greater than 1, and the first dimension is treated as the minibatch dimension. Elements of the `SparseTensor` must be sorted in increasing order of this first dimension. The serialized `SparseTensor` objects going into each row of the output `Tensor` will have rank `R-1`. The minibatch size `N` is extracted from `sparse_shape[0]`. Args: sp_input: The input rank `R` `SparseTensor`. container: The container for the underlying `SparseTensorsMap` (optional). shared_name: The shared name for the underlying `SparseTensorsMap` (optional, defaults to the name of the newly created op). name: A name prefix for the returned tensors (optional). Returns: A string matrix (2-D `Tensor`) with `N` rows and `1` column. Each row represents a unique handle to a `SparseTensor` stored by the `SparseTensorMap` underlying this op. Raises: TypeError: If `sp_input` is not a `SparseTensor`. """ sp_input = _convert_to_sparse_tensor(sp_input) return gen_sparse_ops.add_many_sparse_to_tensors_map( sp_input.indices, sp_input.values, sp_input.dense_shape, container=container, shared_name=shared_name, name=name) def _take_many_sparse_from_tensors_map(sparse_map_op, sparse_handles, rank=None, name=None): """Read `SparseTensors` from a `SparseTensorsMap` and concatenate them. The input `sparse_handles` must be a string matrix of shape `[N, 1]` where `N` is the minibatch size and the rows correspond to packed outputs of `add_sparse_to_tensors_map`. The ranks of the original `SparseTensor` objects must all match. When the final `SparseTensor` is created, it has rank one higher than the ranks of the incoming `SparseTensor` objects (they have been concatenated along a new row dimension). The output `SparseTensor` object's shape values for all dimensions but the first are the max across the input `SparseTensor` objects' shape values for the corresponding dimensions. Its first shape value is `N`, the minibatch size. The input `SparseTensor` objects' indices are assumed ordered in standard lexicographic order. If this is not the case, after this step run `sparse.reorder` to restore index ordering. For example, if the serialized input is a `[2, 3]` matrix representing two original `SparseTensor` objects: index = [ 0] [10] [20] values = [1, 2, 3] shape = [50] and index = [ 2] [10] values = [4, 5] shape = [30] then the final deserialized `SparseTensor` will be: index = [0 0] [0 10] [0 20] [1 2] [1 10] values = [1, 2, 3, 4, 5] shape = [2 50] Args: sparse_map_op: The `Operation` that created the original handles. Usually this is, e.g., `add_sparse_to_tensors_map(...).op`. sparse_handles: 2-D `Tensor` of type `string` of shape `[N, 1]`. The serialized and packed `SparseTensor` objects. rank: (optional) Python int, the rank of the `SparseTensor` objects. name: A name prefix for the returned tensors (optional) Returns: A `SparseTensor` representing the deserialized `SparseTensor`s, concatenated along the `SparseTensor`s' first dimension. All of the serialized `SparseTensor`s must have had the same rank and type. """ if not isinstance(sparse_map_op, ops.Operation): raise TypeError("sparse_map_op be an Operation") if sparse_map_op.type not in ("AddSparseToTensorsMap", "AddManySparseToTensorsMap"): raise TypeError( "sparse_map_op must be one of AddSparseToTensorsMap or " "AddSparseToTensorsMap. Instead, found `%s`." % sparse_map_op.type) with ops.colocate_with(sparse_map_op): shared_name = sparse_map_op.get_attr("shared_name") or sparse_map_op.name output_indices, output_values, output_shape = ( gen_sparse_ops.take_many_sparse_from_tensors_map( sparse_handles, dtype=sparse_map_op.get_attr("T"), container=sparse_map_op.get_attr("container"), shared_name=shared_name, name=name)) # Feed rank data back in, if available output_indices.set_shape([None, rank]) output_shape.set_shape([rank]) return sparse_tensor.SparseTensor(output_indices, output_values, output_shape) class _UnaryMapValueDispatcher(dispatch.OpDispatcher): """OpDispatcher for unary ops that maps base function across sparse values.""" def __init__(self, original_func): self._original_func = original_func func_name = get_canonical_name_for_symbol(original_func) arg_names = tf_inspect.getfullargspec(original_func)[0] self._x = arg_names[0] original_func.__doc__ = ( original_func.__doc__.rstrip() + "\n\n" + (" If `{x}` is a `SparseTensor`, returns\n" " `SparseTensor({x}.indices, tf.{func}({x}.values, ...), " "{x}.dense_shape)`").format(x=self._x, func=func_name)) def handle(self, args, kwargs): if args: x, args = args[0], args[1:] else: kwargs = kwargs.copy() x = kwargs.pop(self._x, None) if isinstance(x, sparse_tensor.SparseTensor): return sparse_tensor.SparseTensor( indices=x.indices, values=self._original_func(x.values, *args, **kwargs), dense_shape=x.dense_shape) else: return self.NOT_SUPPORTED _UNARY_OPS = [ # TODO(b/120307967) Add dispatchers for additional TensorFlow ops. math_ops.abs, math_ops.negative, math_ops.sign, math_ops.square, math_ops.sqrt, math_ops.erf, math_ops.tanh, # TODO(b/157272291) Add dispatchers for rest of special functions. special_math_ops.bessel_i0e, special_math_ops.bessel_i1e, ] for unary_op in _UNARY_OPS: _UnaryMapValueDispatcher(unary_op).register(unary_op)