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add __len__ to get dp length #1289

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add __len__ to get dp length #1289

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7 changes: 6 additions & 1 deletion torchdata/datapipes/iter/util/webdataset.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,7 @@
# LICENSE file in the root directory of this source tree.

import re
from typing import Any, Dict, Iterator, List, Union
from typing import Any, Dict, Iterator, List, Union, Sized

from torchdata.datapipes import functional_datapipe
from torchdata.datapipes.iter import IterDataPipe
Expand Down Expand Up @@ -99,3 +99,8 @@ def __iter__(self) -> Iterator[Dict]:
sample[suffix] = data
if sample != {}:
yield sample

def __len__(self):
if isinstance(self.source_datapipe, Sized):
return len(self.source_datapipe)
raise TypeError(f"{type(self).__name__} instance doesn't have valid length")