64 lines
2.4 KiB
Python
64 lines
2.4 KiB
Python
# Copyright 2022 The TensorFlow Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# ==============================================================================
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"""The implementation of `tf.data.Dataset.concatenate`."""
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from tensorflow.python.data.ops import dataset_ops
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from tensorflow.python.ops import gen_dataset_ops
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from tensorflow.python.util import nest as tf_nest
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def _concatenate(input_dataset, dataset_to_concatenate, name): # pylint: disable=unused-private-name
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return _ConcatenateDataset(input_dataset, dataset_to_concatenate, name)
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class _ConcatenateDataset(dataset_ops.DatasetV2):
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"""A `Dataset` that concatenates its input with given dataset."""
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def __init__(self, input_dataset, dataset_to_concatenate, name=None):
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"""See `Dataset.concatenate()` for details."""
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self._input_dataset = input_dataset
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self._dataset_to_concatenate = dataset_to_concatenate
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def common_supertype(a, b):
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result = a.most_specific_common_supertype([b])
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if result is None:
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raise TypeError(f"No common supertype of {a} and {b}.")
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return result
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try:
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self._structure = tf_nest.map_structure(
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common_supertype, input_dataset.element_spec,
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dataset_to_concatenate.element_spec)
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except (TypeError, ValueError) as e:
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raise TypeError(f"Incompatible dataset elements:\n"
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f" {input_dataset.element_spec} vs. "
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f" {dataset_to_concatenate.element_spec}") from e
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self._input_datasets = [input_dataset, dataset_to_concatenate]
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self._name = name
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# pylint: disable=protected-access
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variant_tensor = gen_dataset_ops.concatenate_dataset(
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input_dataset._variant_tensor, dataset_to_concatenate._variant_tensor,
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**self._common_args)
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# pylint: enable=protected-access
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super().__init__(variant_tensor)
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def _inputs(self):
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return self._input_datasets
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@property
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def element_spec(self):
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return self._structure
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