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add 2020 pyserini indexed data

Update README.md

upload dragon-plus embeddings of wiki-dec-2018

upload pyserini bm25 index of wiki-dec-2018

remove multiple

typo

add pyserini enwiki2021 index

remove multiple files

separate datasets with embeddings

Upload dragon_enwiki2021_dev.tar.gz

Upload contriever_msmarco_enwiki2021_dev.tar.gz

Rename pyserni-enwiki-dec2021.tar.gz to pyserini-enwiki-dec2021.tar.gz

Upload pyserni-enwiki-dec2021.tar.gz

Upload contrievermsmarco-embedding_enwiki-dec2021.tar.gz

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initial commit