52 lines
2.0 KiB
Python
52 lines
2.0 KiB
Python
|
# Copyright 2020 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.
|
||
|
|
# ==============================================================================
|
||
|
|
"""Ops for compressing and uncompressing dataset elements."""
|
||
|
|
from tensorflow.python.data.util import structure
|
||
|
|
from tensorflow.python.ops import gen_experimental_dataset_ops as ged_ops
|
||
|
|
|
||
|
|
|
||
|
|
def compress(element):
|
||
|
|
"""Compress a dataset element.
|
||
|
|
|
||
|
|
Args:
|
||
|
|
element: A nested structure of types supported by Tensorflow.
|
||
|
|
|
||
|
|
Returns:
|
||
|
|
A variant tensor representing the compressed element. This variant can be
|
||
|
|
passed to `uncompress` to get back the original element.
|
||
|
|
"""
|
||
|
|
element_spec = structure.type_spec_from_value(element)
|
||
|
|
tensor_list = structure.to_tensor_list(element_spec, element)
|
||
|
|
return ged_ops.compress_element(tensor_list)
|
||
|
|
|
||
|
|
|
||
|
|
def uncompress(element, output_spec):
|
||
|
|
"""Uncompress a compressed dataset element.
|
||
|
|
|
||
|
|
Args:
|
||
|
|
element: A scalar variant tensor to uncompress. The element should have been
|
||
|
|
created by calling `compress`.
|
||
|
|
output_spec: A nested structure of `tf.TypeSpec` representing the type(s) of
|
||
|
|
the uncompressed element.
|
||
|
|
|
||
|
|
Returns:
|
||
|
|
The uncompressed element.
|
||
|
|
"""
|
||
|
|
flat_types = structure.get_flat_tensor_types(output_spec)
|
||
|
|
flat_shapes = structure.get_flat_tensor_shapes(output_spec)
|
||
|
|
tensor_list = ged_ops.uncompress_element(
|
||
|
|
element, output_types=flat_types, output_shapes=flat_shapes)
|
||
|
|
return structure.from_tensor_list(output_spec, tensor_list)
|