# How to use Seq2SeqTrainer (Seq2SeqDataCollator) in v4.2.1

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**Category:** 🤗Transformers\
**Created:** [January 17, 2021, 9:27am UTC](/static-proxy?url=https%3A%2F%2Fdiscuss.huggingface.co%2Ft%2Fhow-to-use-seq2seqtrainer-seq2seqdatacollator-in-v4-2-1%2F3243 "2021-01-17T09:27:04Z")\
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**Author:** ![sgugger](https://sea2.discourse-cdn.com/hellohellohello/user_avatar/discuss.huggingface.co/sgugger/32/2291_2.png) [@sgugger](/static-proxy?url=https%3A%2F%2Fdiscuss.huggingface.co%2Fu%2Fsgugger)%5C
**Post date:** [January 19, 2021, 9:15pm UTC](/static-proxy?url=https%3A%2F%2Fdiscuss.huggingface.co%2Ft%2Fhow-to-use-seq2seqtrainer-seq2seqdatacollator-in-v4-2-1%2F3243%2F5 "2021-01-19T21:15:43Z")

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The PR has been merged, so you should be able to use a similar workflow. Note that the processing that used to be done in `Seq2SeqDataCollator` is now done on the dataset directly.

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