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Implement len in IterableDatasetShard #13780

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merged 1 commit into from Sep 28, 2021
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Implement len in IterableDatasetShard #13780

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7 changes: 7 additions & 0 deletions src/transformers/trainer_pt_utils.py
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Expand Up @@ -772,6 +772,13 @@ def __iter__(self):
for i in process_slice:
yield current_batch[i]

def __len__(self):
# Will raise an error if the underlying dataset is not sized.
if self.drop_last:
return len(self.dataset) // self.num_processes
else:
return math.ceil(len(self.dataset) / self.num_processes)


# In order to keep `trainer.py` compact and easy to understand, place any secondary PT Trainer
# helper methods here
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