How to load a previously saved index?

[jamjpan]

I'm using write_index to save an IndexACORNFlat to disk and then IndexACORN(faiss::read_index(filename), params...) to read it back. Is this the right way to do it? I'm asking because when I then go to do IndexACORN.search(...char* filter_id_map), I don't get any search results, and I'm wondering if it's due to the way I'm reading/writing the index or something else. Thanks.

[jamjpan]

This morning I tried directly searching an index without first writing to and reading back from disk and now I'm getting search results, so looks like a problem with using write_index followed by read_index.

[ziqiwww]

I'm using the following code, and the results are identical to the ones generated before the indexes were written to disk.

auto& base_index = *dynamic_cast<faiss::IndexHNSWFlat*>(faiss::read_index(base_index_file.c_str()));
auto& hybrid_index = *dynamic_cast<faiss::IndexACORNFlat*>(faiss::read_index(hybrid_index_file.c_str()));
auto& hybrid_index_gamma1 = *dynamic_cast<faiss::IndexACORNFlat*>(faiss::read_index(hybrid_index_gamma1_file.c_str()));