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README.md

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+This model is a T5-base reranker fine-tuned on MS MARCO passage dataset for 10k steps (or 1 epochs) and then fine-tuned again on MedMARCO (from [Sledge-Z paper](https://www.aclweb.org/anthology/2020.emnlp-main.341.pdf) for 1k steps.
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+For more details on how to use it, check [pygaggle.ai](pygaggle.ai)
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+Paper describing the model: [Document Ranking with a Pretrained Sequence-to-Sequence Model](https://www.aclweb.org/anthology/2020.findings-emnlp.63/):