Hi, the hnsw documentation for the Lucene HnswGraph and the SolR vector search is not very verbose, especially in regards to the parameters hnswMaxConn and hnswBeamWidth. I find it hard to come up with sensible values for these parameters by reading the paper from 2018. Does anyone have experience with the influence of the parameters on the results? As far as I understand the code the graph is created at indexing time so it would be time intensive to come up with the optimal values for a specific use case by trial and error?
We have a SolR index with roughly 100 million embeddings and in a synthetic randomized benchmarks around 14% percent of requests will result in a suboptimal answer (based on the cosine vector similarity). I expected this "error" rate to be much smaller. I would love to hear your experiences. Best regards Andreas Moll
