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picklable batch_fn #7826

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Merged
merged 1 commit into from
Oct 23, 2025
Merged

picklable batch_fn #7826

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9 changes: 5 additions & 4 deletions src/datasets/iterable_dataset.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3581,15 +3581,12 @@ def batch(self, batch_size: int, drop_last_batch: bool = False) -> "IterableData
```
"""

def batch_fn(unbatched):
return {k: [v] for k, v in unbatched.items()}

if self.features:
features = Features({col: List(feature) for col, feature in self.features.items()})
else:
features = None
return self.map(
batch_fn, batched=True, batch_size=batch_size, drop_last_batch=drop_last_batch, features=features
_batch_fn, batched=True, batch_size=batch_size, drop_last_batch=drop_last_batch, features=features
)

def to_dict(self, batch_size: Optional[int] = None, batched: bool = False) -> Union[dict, Iterator[dict]]:
Expand Down Expand Up @@ -4659,3 +4656,7 @@ async def _apply_async(pool, func, x):
return future.get()
else:
await asyncio.sleep(0)


def _batch_fn(unbatched):
return {k: [v] for k, v in unbatched.items()}
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