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shuffle_test.py
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shuffle_test.py
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# coding=utf-8
# Copyright 2020 The TensorFlow Datasets Authors.
#
# 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.
# Lint as: python3
"""Tests for tensorflow_datasets.core.shuffle."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import collections
from absl.testing.absltest import mock
from tensorflow_datasets import testing
from tensorflow_datasets.core import shuffle
_ITEMS = [
(1, b'The'),
(2, b'quick '),
(3, b'brown'),
(4, b' fox '),
(5, b'jumps'),
('6', b'over'),
(b'7', b' the '),
(8, b'lazy'),
(9, b' dog.'),
]
_ORDERED_ITEMS_SPLIT1 = [
b' fox ',
b'The',
b'over',
b'quick ',
b'lazy',
b'jumps',
b' the ',
b' dog.',
b'brown',
]
_ORDERED_ITEMS_SPLIT2 = [
b' dog.',
b'quick ',
b'jumps',
b' fox ',
b' the ',
b'brown',
b'over',
b'lazy',
b'The',
]
_TOTAL_SIZE = sum(len(rec) for rec in _ORDERED_ITEMS_SPLIT1)
class GetShardTest(testing.TestCase):
@mock.patch.object(shuffle, 'HKEY_SIZE', 10) # 1024 keys.
def test_order(self):
shards_number = 10
shards = [shuffle.get_bucket_number(k, shards_number) for k in range(1024)]
# Check max(shard_x) < min(shard_y) if x < y.
previous_shard = 0
for shard in shards:
self.assertGreaterEqual(shard, previous_shard)
previous_shard = shard
# Check distribution: all shards are used.
counts = collections.Counter(shards)
self.assertEqual(len(counts), shards_number)
# And all shards contain same number of elements (102 or 102 in that case).
self.assertEqual(len(set(counts.values())), 2)
class ShuffleTest(testing.TestCase):
def _test_items(self, salt, expected_order):
shuffler = shuffle.Shuffler(self.get_temp_dir(), salt)
for key, item in _ITEMS:
shuffler.add(key, item)
self.assertEqual(shuffler.size, _TOTAL_SIZE)
if not shuffler._in_memory: # Check size of temporary bucket files
expected_size = (16 + 8) * len(_ITEMS) + sum(len(t[1]) for t in _ITEMS)
size = 0
for bucket in shuffler._buckets:
if not bucket._fobj:
continue
bucket._fobj.close()
size += len(open(bucket._path, 'rb').read())
self.assertEqual(size, expected_size)
# Check records can be read as expected:
records = list(iter(shuffler))
self.assertEqual(records, expected_order)
def test_all_mem(self):
self._test_items('split1', _ORDERED_ITEMS_SPLIT1)
self._test_items('split2', _ORDERED_ITEMS_SPLIT2)
@mock.patch.object(shuffle, 'MAX_MEM_BUFFER_SIZE', 0)
def test_disk(self):
self._test_items('split1', _ORDERED_ITEMS_SPLIT1)
self._test_items('split2', _ORDERED_ITEMS_SPLIT2)
def test_nonbytes(self):
shuffler = shuffle.Shuffler(self.get_temp_dir(), 'split1')
with self.assertRaisesWithPredicateMatch(AssertionError, 'Only bytes'):
shuffler.add(1, u'a')
with self.assertRaisesWithPredicateMatch(AssertionError, 'Only bytes'):
shuffler.add(1, 123)
def test_duplicate_key(self):
shuffler = shuffle.Shuffler(self.get_temp_dir(), 'split1')
shuffler.add(1, b'a')
shuffler.add(2, b'b')
shuffler.add(1, b'c')
iterator = iter(shuffler)
self.assertEqual(next(iterator), b'a')
with self.assertRaises(shuffle.DuplicatedKeysError):
next(iterator)
if __name__ == '__main__':
testing.test_main()