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I recently learned about ColBERT, a BERT-based model for efficient passage retrieval. The authors of the paper ColBERT: Efficient and Effective Passage Search via Contextualized Late Interaction over BERT claim that ColBERT is able to achieve state-of-the-art performance on the MS MARCO passage ranking task while being 10x faster than the previous state-of-the-art model. This is a post to summarize my learnings about ColBERT and how it compares to dense retrieval methods like BERT and sentence-t...