>then possibly combine search results with keyword based search (say BM25) to >improve accuracy etc. I am still waiting to see an end-to-end API doing all this

>then possibly combine search results with keyword based search (say BM25) to >improve accuracy etc. I am still waiting to see an end-to-end API doing all this > Vespa.ai supports combining dense vector search with keyword search and ranking, see https://docs.google.com/presentation/d/1vWKhSvFH-4MFcs4aNa9CNAy4m_TRMNJ0oJ_va7t3OFA/edit#slide=id.p1 https://docs.google.com/presentation/d/1vWKhSvFH-4MFcs4aNa9C... There is also a Vespa sample application (open source, Apache 2) demonstrating multiple different retrieval and ranking strategies over at https://github.com/vespa-engine/sample-apps/blob/master/msmarco-ranking/passage-ranking.md https://github.com/vespa-engine/sample-apps/blob/master/msma...