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Fix Arrow dataset loading with Windows workers #529

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Fix Arrow dataset loading with Windows workers #529

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6142a5c
GitContribute issue #285
kiwoongyoon Aug 23, 2026
ae2997e
Merge branch 'main' into gitcontribute/20260823-040816-028611-amazon-…
kiwoongyoon Sep 9, 2026
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12 changes: 11 additions & 1 deletion scripts/training/train.py
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Original file line number Diff line number Diff line change
Expand Up @@ -263,6 +263,16 @@ def shuffle(self, shuffle_buffer_length: int = 100):
return PseudoShuffledIterableDataset(self, shuffle_buffer_length)


class LazyFileDataset:
"""Open a GluonTS file only when its worker starts iterating."""

def __init__(self, path: Path) -> None:
self.path = path

def __iter__(self):
return iter(FileDataset(path=self.path, freq="h"))


class ChronosDataset(IterableDataset, ShuffleMixin):
"""
Dataset wrapper, using a ``ChronosTokenizer`` to turn data from a time series
Expand Down Expand Up @@ -608,7 +618,7 @@ def main(
min_length=min_past + prediction_length,
max_missing_prop=max_missing_prop,
),
FileDataset(path=Path(data_path), freq="h"),
LazyFileDataset(path=Path(data_path)),
)
for data_path in training_data_paths
]
Expand Down