Multi-Vector Retrieval Strategy: Separability Determines nDCG@10 Success
Choosing the wrong approximate strategy in multi-vector retrieval causes a 6x drop in nDCG@10, exceeding model upgrade gains. Measure embedding space separability via MaxSim std dev: use TokenANN/MUVERA for high spread, LEMUR for low spread.
入选理由:Wrong approximate strategy drops nDCG@10 from 0.701 to 0.109 on the same model/d



