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Add Dataloader2 training loop example with torch text #670

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Add Dataloader2 training loop example with torch text #670

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Commits on Jul 21, 2022

  1. Add Dataloader2 training loop example with torch text (pytorch#670) 

    Summary:
Pull Request resolved: pytorch#670

* Add the uscase and example of DataLoader2 with open source datasets/datapipes.
TorchText provides several standard NLP datasets; here we use its SST2 OSS dataset
 in the DataLoader2 train loop.

* We will have more examples to showcase the advantages:
(1) The usage of the DLv2 with popular open source dataset.
(2) Integrate datasets/datapipes with different reading service.
(3) Datapipe manipulation for example batch, collate, map.
(4) Dist usage and examples with features such as sharding_filter for the sharding feature.
(5) Eventually add those examples to the pytorch tutorials.

Reviewed By: ejguan

Differential Revision: D37938017

fbshipit-source-id: e00c6f7af63b5a6d33ed138c563f4b20881b5ad6
    @dahsh @facebook-github-bot
    dahsh authored and facebook-github-bot committed Jul 21, 2022
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