Is it possible to lazy load index from disk?

[mayunlei]

Summary

now, faiss index must load all index into memory before searching.
Is it possible to lazy load index from disk into memory for IVF index ?
For a query, only nprobe parts of ivf index is needed , so it is possible to read only needed ivf lists into memory in searching time. those loaded ivf lists may be cached in memory or be released after searching.
Is there any consideration why lazy load is not supported?

[mdouze]

See https://github.com/facebookresearch/faiss/wiki/Indexes-that-do-not-fit-in-RAM#on-disk-storage