text: # Copyright 2018 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.
  # ==============================================================================
  """Tests for the GroupByReducer serialization."""
  from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  
  import numpy as np
  
  from tensorflow.python.data.experimental.kernel_tests.serialization import dataset_serialization_test_base
  from tensorflow.python.data.experimental.ops import grouping
  from tensorflow.python.data.ops import dataset_ops
  from tensorflow.python.platform import test
  
  
  class GroupByReducerSerializationTest(
      dataset_serialization_test_base.DatasetSerializationTestBase):
  
    def _build_dataset(self, components):
      reducer = grouping.Reducer(
          init_func=lambda _: np.int64(0),
          reduce_func=lambda x, y: x + y,
          finalize_func=lambda x: x)
  
      return dataset_ops.Dataset.from_tensor_slices(components).apply(
          grouping.group_by_reducer(lambda x: x % 5, reducer))
  
    def testCoreGroupByReducer(self):
      components = np.array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9], dtype=np.int64)
      self.verify_unused_iterator(
          lambda: self._build_dataset(components), 5, verify_exhausted=True)
      self.verify_multiple_breaks(
          lambda: self._build_dataset(components), 5, verify_exhausted=True)
      self.verify_reset_restored_iterator(
          lambda: self._build_dataset(components), 5, verify_exhausted=True)
  
  
  if __name__ == '__main__':
    test.main()
  