Issues: Adding a FAISS or Elastic Search index to a Dataset
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`DPRContextEncoder` and `DPRContextEncoderTokenizer` will be available in the next release of `transformers`.

Right now you can experiment with it by installing `transformers` from the master branch.
You can also check the docs of DPR [here](https://huggingface.co/transformers/master/model_doc/dpr.html).

Moreover all the indexing features will also be available in the next release of `nlp`.
2020-07-27T09:12:58Z
https://github.com/huggingface/datasets/issues/439#issuecomment-664226843
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2020-07-27T09:12:58Z
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@lhoestq Thanks for the info 
2020-07-27T14:28:34Z
https://github.com/huggingface/datasets/issues/439#issuecomment-664430293
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@lhoestq  I tried installing transformer from the master branch. Python imports for DPR again didnt' work.  Anyways, Looking forward to trying it in the next release of nlp 
2020-08-04T08:02:52Z
https://github.com/huggingface/datasets/issues/439#issuecomment-668446955
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2020-08-04T08:03:12Z
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@nsankar have you tried with the latest version of the library?
2020-10-27T15:48:51Z
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@yjernite it worked. Thanks
2020-10-28T01:46:17Z
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It seems the DPRContextEncoder, DPRContextEncoderTokenizer cited[ in this documentation](https://huggingface.co/nlp/faiss_and_ea.html) is not implemented ? It didnot work with the standard nlp installation . Also, I couldn't find or use it with the latest nlp install from github in Colab.  Is  there any dependency on the latest PyArrow 1.0.0 ? Is it yet to be made generally available ?