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Support len for SPDL dataloader #839

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Merged
facebook-github-bot merged 1 commit into from
Jul 15, 2025
Merged

Support len for SPDL dataloader #839

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10 changes: 9 additions & 1 deletion src/spdl/source/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@
import random
import sys
import time
from collections.abc import Iterable, Iterator, Sequence
from collections.abc import Iterable, Iterator, Sequence, Sized
from typing import TypeVar

from ._type import IterableWithShuffle
Expand Down Expand Up @@ -220,6 +220,14 @@ def __iter__(self) -> Iterator[T]:
if self._shuffle_last:
self._shuffle()

def __len__(self) -> int:
if isinstance(self.src, Sized):
return len(self.src)
else:
raise TypeError(
f"Source iterator of type {type(self.src)} does not support length"
)


def embed_shuffle(
src: IterableWithShuffle[T], /, *, shuffle_last: bool = False, epoch: int = 0
Expand Down
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