mirror of
https://github.com/facebookresearch/fairseq.git
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fb64e43c67
Summary: Pull Request resolved: https://github.com/fairinternal/fairseq-py/pull/2464 Reviewed By: myleott Differential Revision: D31742871 Pulled By: sshleifer fbshipit-source-id: e5d29ca9d594abd92212eb24b60c991f2840a4e8
195 lines
7.5 KiB
Python
195 lines
7.5 KiB
Python
# Copyright (c) Facebook, Inc. and its affiliates.
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#
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# This source code is licensed under the MIT license found in the
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# LICENSE file in the root directory of this source tree.
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import unittest
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from fairseq.data import iterators, ListDataset
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class TestIterators(unittest.TestCase):
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def test_counting_iterator_index(self, ref=None, itr=None):
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# Test the indexing functionality of CountingIterator
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if ref is None:
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assert itr is None
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ref = list(range(10))
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itr = iterators.CountingIterator(ref)
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else:
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assert len(ref) == 10
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assert itr is not None
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self.assertTrue(itr.has_next())
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self.assertEqual(itr.n, 0)
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self.assertEqual(next(itr), ref[0])
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self.assertEqual(itr.n, 1)
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self.assertEqual(next(itr), ref[1])
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self.assertEqual(itr.n, 2)
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itr.skip(3)
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self.assertEqual(itr.n, 5)
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self.assertEqual(next(itr), ref[5])
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itr.skip(2)
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self.assertEqual(itr.n, 8)
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self.assertEqual(list(itr), [ref[8], ref[9]])
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self.assertFalse(itr.has_next())
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def test_counting_iterator_length_mismatch(self):
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ref = list(range(10))
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# When the underlying iterable is longer than the CountingIterator,
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# the remaining items in the iterable should be ignored
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itr = iterators.CountingIterator(ref, total=8)
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self.assertEqual(list(itr), ref[:8])
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# When the underlying iterable is shorter than the CountingIterator,
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# raise an IndexError when the underlying iterable is exhausted
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itr = iterators.CountingIterator(ref, total=12)
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self.assertRaises(IndexError, list, itr)
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def test_counting_iterator_take(self):
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# Test the "take" method of CountingIterator
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ref = list(range(10))
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itr = iterators.CountingIterator(ref)
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itr.take(5)
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self.assertEqual(len(itr), len(list(iter(itr))))
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self.assertEqual(len(itr), 5)
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itr = iterators.CountingIterator(ref)
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itr.take(5)
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self.assertEqual(next(itr), ref[0])
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self.assertEqual(next(itr), ref[1])
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itr.skip(2)
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self.assertEqual(next(itr), ref[4])
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self.assertFalse(itr.has_next())
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def test_grouped_iterator(self):
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# test correctness
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x = list(range(10))
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itr = iterators.GroupedIterator(x, 1)
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self.assertEqual(list(itr), [[0], [1], [2], [3], [4], [5], [6], [7], [8], [9]])
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itr = iterators.GroupedIterator(x, 4)
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self.assertEqual(list(itr), [[0, 1, 2, 3], [4, 5, 6, 7], [8, 9]])
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itr = iterators.GroupedIterator(x, 5)
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self.assertEqual(list(itr), [[0, 1, 2, 3, 4], [5, 6, 7, 8, 9]])
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# test the GroupIterator also works correctly as a CountingIterator
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x = list(range(30))
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ref = list(iterators.GroupedIterator(x, 3))
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itr = iterators.GroupedIterator(x, 3)
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self.test_counting_iterator_index(ref, itr)
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def test_sharded_iterator(self):
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# test correctness
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x = list(range(10))
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itr = iterators.ShardedIterator(x, num_shards=1, shard_id=0)
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self.assertEqual(list(itr), x)
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itr = iterators.ShardedIterator(x, num_shards=2, shard_id=0)
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self.assertEqual(list(itr), [0, 2, 4, 6, 8])
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itr = iterators.ShardedIterator(x, num_shards=2, shard_id=1)
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self.assertEqual(list(itr), [1, 3, 5, 7, 9])
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itr = iterators.ShardedIterator(x, num_shards=3, shard_id=0)
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self.assertEqual(list(itr), [0, 3, 6, 9])
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itr = iterators.ShardedIterator(x, num_shards=3, shard_id=1)
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self.assertEqual(list(itr), [1, 4, 7, None])
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itr = iterators.ShardedIterator(x, num_shards=3, shard_id=2)
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self.assertEqual(list(itr), [2, 5, 8, None])
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# test CountingIterator functionality
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x = list(range(30))
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ref = list(iterators.ShardedIterator(x, num_shards=3, shard_id=0))
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itr = iterators.ShardedIterator(x, num_shards=3, shard_id=0)
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self.test_counting_iterator_index(ref, itr)
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def test_counting_iterator_buffered_iterator_take(self):
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ref = list(range(10))
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buffered_itr = iterators.BufferedIterator(2, ref)
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itr = iterators.CountingIterator(buffered_itr)
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itr.take(5)
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self.assertEqual(len(itr), len(list(iter(itr))))
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self.assertEqual(len(itr), 5)
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buffered_itr = iterators.BufferedIterator(2, ref)
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itr = iterators.CountingIterator(buffered_itr)
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itr.take(5)
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self.assertEqual(len(buffered_itr), 5)
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self.assertEqual(len(list(iter(buffered_itr))), 5)
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buffered_itr = iterators.BufferedIterator(2, ref)
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itr = iterators.CountingIterator(buffered_itr)
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itr.take(5)
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self.assertEqual(next(itr), ref[0])
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self.assertEqual(next(itr), ref[1])
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itr.skip(2)
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self.assertEqual(next(itr), ref[4])
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self.assertFalse(itr.has_next())
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self.assertRaises(StopIteration, next, buffered_itr)
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ref = list(range(4, 10))
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buffered_itr = iterators.BufferedIterator(2, ref)
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itr = iterators.CountingIterator(buffered_itr, start=4)
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itr.take(5)
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self.assertEqual(len(itr), 5)
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self.assertEqual(len(buffered_itr), 1)
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self.assertEqual(next(itr), ref[0])
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self.assertFalse(itr.has_next())
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self.assertRaises(StopIteration, next, buffered_itr)
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def test_epoch_batch_iterator_skip_remainder_batch(self):
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reference = [1, 2, 3]
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itr1 = _get_epoch_batch_itr(reference, 2, True)
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self.assertEqual(len(itr1), 1)
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itr2 = _get_epoch_batch_itr(reference, 2, False)
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self.assertEqual(len(itr2), 2)
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itr3 = _get_epoch_batch_itr(reference, 1, True)
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self.assertEqual(len(itr3), 2)
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itr4 = _get_epoch_batch_itr(reference, 1, False)
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self.assertEqual(len(itr4), 3)
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itr5 = _get_epoch_batch_itr(reference, 4, True)
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self.assertEqual(len(itr5), 0)
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self.assertFalse(itr5.has_next())
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itr6 = _get_epoch_batch_itr(reference, 4, False)
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self.assertEqual(len(itr6), 1)
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def test_grouped_iterator_skip_remainder_batch(self):
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reference = [1, 2, 3, 4, 5, 6, 7, 8, 9]
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itr1 = _get_epoch_batch_itr(reference, 3, False)
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grouped_itr1 = iterators.GroupedIterator(itr1, 2, True)
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self.assertEqual(len(grouped_itr1), 1)
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itr2 = _get_epoch_batch_itr(reference, 3, False)
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grouped_itr2 = iterators.GroupedIterator(itr2, 2, False)
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self.assertEqual(len(grouped_itr2), 2)
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itr3 = _get_epoch_batch_itr(reference, 3, True)
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grouped_itr3 = iterators.GroupedIterator(itr3, 2, True)
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self.assertEqual(len(grouped_itr3), 1)
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itr4 = _get_epoch_batch_itr(reference, 3, True)
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grouped_itr4 = iterators.GroupedIterator(itr4, 2, False)
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self.assertEqual(len(grouped_itr4), 1)
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itr5 = _get_epoch_batch_itr(reference, 5, True)
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grouped_itr5 = iterators.GroupedIterator(itr5, 2, True)
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self.assertEqual(len(grouped_itr5), 0)
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itr6 = _get_epoch_batch_itr(reference, 5, True)
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grouped_itr6 = iterators.GroupedIterator(itr6, 2, False)
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self.assertEqual(len(grouped_itr6), 1)
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def _get_epoch_batch_itr(ref, bsz, skip_remainder_batch):
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dsz = len(ref)
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indices = range(dsz)
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starts = indices[::bsz]
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batch_sampler = [indices[s : s + bsz] for s in starts]
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dataset = ListDataset(ref)
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itr = iterators.EpochBatchIterator(
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dataset=dataset,
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collate_fn=dataset.collater,
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batch_sampler=batch_sampler,
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skip_remainder_batch=skip_remainder_batch,
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)
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return itr.next_epoch_itr()
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if __name__ == "__main__":
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unittest.main()
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