A state-of-the-art Information Retrieval system for TREC ROBUST04 achieving MAP 0.3309. Features a Novel 4-Way RRF Fusion architecture combining BM25, Neural Reranking (Cross-Encoders), and LLM-Augmented Query Expansion (Query2Doc) via LiteLLM.
information-retrieval bm25 query-expansion neural-search cross-encoders pyserini litellm reciprocal-rank-fusion rag-pipeline robust04
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Updated
Jan 27, 2026 - Python