Create README.md

README.md

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+Dense passage retriever (DPR) is a dense retrieval method described in the following paper:
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+> Vladimir Karpukhin, Barlas Oğuz, Sewon Min, Patrick Lewis, Ledell Wu, Sergey Edunov, Danqi Chen, Wen-tau Yih. [Dense Passage Retrieval for Open-Domain Question Answering](https://www.aclweb.org/anthology/2020.emnlp-main.550/). _Proceedings of the 2020 Conference on Empirical Methods in Natural Language Processing (EMNLP)_, pages 6769-6781, 2020.
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+We have trained our own DPR models with our Wikipedia corpus variants using the [Tevatron](https://github.com/texttron/tevatron) library.
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+Our own efforts are described in the paper entitled: 
+> Pre-Processing Matters! Improved Wikipedia Corpora for Open-Domain Question Answering.
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+This is the query encoder portion of a 2nd iteration DPR model for the wiki-text-8-4 corpus variant trained on the amalgamation of the NQ, TriviaQA, WQ, and CuratedTREC datasets.