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Internal #1242

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10 changes: 6 additions & 4 deletions grain/_src/python/dataset/transformations/interleave.py
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Original file line number Diff line number Diff line change
Expand Up @@ -336,10 +336,12 @@ def _add_prefetch_and_make_iterator(
raise RuntimeError("InterleaveDatasetIterator has been garbage collected.")
if isinstance(ds, dataset.MapDataset):
# Prefetch is automatically added in `MapDataset.__iter__`.
return ds.__iter__()
iterator = prefetch.ThreadPrefetchIterDataset(
ds, prefetch_buffer_size=interleave_iterator_obj._iter_buffer_size # pylint: disable=protected-access
).__iter__()
iter_dataset = ds.to_iter_dataset()
else:
iter_dataset = prefetch.ThreadPrefetchIterDataset(
ds, prefetch_buffer_size=interleave_iterator_obj._iter_buffer_size # pylint: disable=protected-access
)
iterator = iter_dataset.__iter__()
# Propagate options applied after InterleaveIterDataset to the iterators that
# are being interleaved.
iterator._ctx.dataset_options = interleave_iterator_obj._ctx.dataset_options.merge(iterator._ctx.dataset_options) # pylint: disable=protected-access
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