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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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kaiyuyue
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dp = ...
dp = dp.load_from_tar(length=ds_length)  # now __len__ will return self.length
dp = dp.webdataset()  # inherit self.length in the __len__

print(len(dp))  # able to get dp length

@facebook-github-bot facebook-github-bot added the CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. label Jul 20, 2024
@andrewkho
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Hi @kaiyuyue, please see #1196 as we won't be supporting dataloader2 nor datapipes in torchdata moving forward

@kaiyuyue kaiyuyue closed this Aug 13, 2024
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