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Merged
copybara-service merged 1 commit into from
Sep 23, 2026
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internal #1402

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11 changes: 11 additions & 0 deletions grain/_src/python/dataset/transformations/shuffle_test.py
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Original file line number Diff line number Diff line change
Expand Up @@ -93,6 +93,17 @@ def test_cross_version_determinism(self):
ds = shuffle.ShuffleMapDataset(ds)
self.assertEqual(list(ds), [1, 7, 6, 9, 0, 8, 4, 5, 3, 2])

def test_slice_then_shuffle(self):
# Slice first to restrict elements to ["b", "c", "d", "e"], then shuffle
# the 4-element sliced dataset.
ds = dataset.MapDataset.source(["a", "b", "c", "d", "e", "f"])[1:5]
self.assertEqual(list(ds), ["b", "c", "d", "e"])
shuffled_ds = ds.shuffle(seed=1)
self.assertLen(shuffled_ds, 4)
# Seed 1 permutes 4 elements as [1, 2, 3, 0], mapping indices to:
# 0 -> "c", 1 -> "d", 2 -> "e", 3 -> "b".
self.assertEqual(list(shuffled_ds), ["c", "d", "e", "b"])


class WindowShuffleMapDatasetTest(absltest.TestCase):

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