Multi-Index Retrieve and Rerank with Sequence-to-Sequence Model

This paper presents the solution to PolEval 2022 Task 3: Passage Retrieval. The main goal of the task, was to retrieve relevant text passages for the query. There were three different domains of passages: wikipedia passages, allegro faq and legal documents. The proposed solution incorporated both dense and lexical indexes, as well as, reranking model and reached 67.44 NDCG@10 score in official evaluation.