ai-research
More Lenses, Less Signal: A 15-Way Ablation of Multi-Embedder RAG Fusion
Hover / tap to read moreMore Lenses, Less Signal: A 15-Way Ablation of Multi-Embedder RAG Fusion
We built a four-lens fusion retrieval stack, then ran the full 15-way ablation. The cheapest two-lens pair — one dense, one sparse — beat the expensive four-lens stack on every ranking metric, and a 27B model was one of the weakest lenses.