Retrieval Reranking Techniques: From Cross-Encoders to LLM-Based Scoring

Introduction: Initial retrieval casts a wide net—vector search or keyword matching returns candidates that might be relevant. Reranking narrows the focus, using more expensive but accurate models to score each candidate against the query. Cross-encoders process query-document pairs together, capturing fine-grained semantic relationships that bi-encoders miss. This two-stage approach balances efficiency with accuracy: fast retrieval […]

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