Implement len in IterableDatasetShard #13780
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What does this PR do?
Currently code using a size iterable dataset in distributed mode will fail because:
This PR adds the
__len__method toIterableDatasetShardto solve that issue. The one thing that is midly annoying is that it will make all instance ofIterableDatasetShardbe recognized ascollections.abc.Sizedinstances since they do implement the len method, even if that method will return an error. But that check is only used on the dataset passed along to theTrainer, not that wrapper, so I think we should be fine.