# 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 segment_id_ops.row_splits_to_segment_ids() op."""

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

from tensorflow.python.framework import constant_op
from tensorflow.python.framework import test_util
from tensorflow.python.ops.ragged import segment_id_ops
from tensorflow.python.platform import googletest


@test_util.run_all_in_graph_and_eager_modes
class RaggedSplitsToSegmentIdsOpTest(test_util.TensorFlowTestCase):

  def testDocStringExample(self):
    splits = [0, 3, 3, 5, 6, 9]
    expected = [0, 0, 0, 2, 2, 3, 4, 4, 4]
    segment_ids = segment_id_ops.row_splits_to_segment_ids(splits)
    self.assertAllEqual(segment_ids, expected)

  def testEmptySplits(self):
    # Note: the splits for an empty ragged tensor contains a single zero.
    segment_ids = segment_id_ops.row_splits_to_segment_ids([0])
    self.assertAllEqual(segment_ids, [])

  def testErrors(self):
    self.assertRaisesRegexp(ValueError, r'Invalid row_splits: \[\]',
                            segment_id_ops.row_splits_to_segment_ids, [])
    self.assertRaisesRegexp(
        ValueError, r'splits must have dtype int32 or int64',
        segment_id_ops.row_splits_to_segment_ids,
        constant_op.constant([0.5]))
    self.assertRaisesRegexp(ValueError, r'Shape \(\) must have rank 1',
                            segment_id_ops.row_splits_to_segment_ids, 0)
    self.assertRaisesRegexp(ValueError, r'Shape \(1, 1\) must have rank 1',
                            segment_id_ops.row_splits_to_segment_ids, [[0]])


if __name__ == '__main__':
  googletest.main()
