Training#Late interaction and joint retrieval training. The embedding model, reranker, and search agent are currently trained independently: the agent learns to write queries against a fixed retrieval stack. Context-1's pipeline reflects the standard two-stage pattern: a fast first stage (hybrid BM25 + dense retrieval) trades expressiveness for speed, then a cross-encoder reranker recovers precision at higher cost per candidate. Late interaction architectures like ColBERT occupy a middle ground, preserving per-token representations for both queries and documents and computing relevance via token-level MaxSim rather than compressing into a single vector. This retains much of the expressiveness of a cross-encoder while remaining efficient enough to score over a larger candidate set than reranking typically permits. Jointly training a late interaction model alongside the search policy could let the retrieval stack co-adapt: the embedding learns to produce token representations that are most discriminative for the queries the agent actually generates, while the agent learns to write queries that exploit the retrieval model's token-level scoring.
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