INDEX NOT LOADING FROM DISK

[Sha-x2-nk]

Summary

I created a faiss index and train it as follows:
faiss::IndexHNSWFlat* generate_index(int m = 128, int ef_search = 250, int ef_construction = 64){
faiss::IndexHNSWFlat* index = new faiss::IndexHNSWFlat(512, m, faiss::METRIC_INNER_PRODUCT);
index->hnsw.efSearch = ef_search;
index->hnsw.efConstruction = ef_construction;

return index;

}
faiss::write_index(index, faiss_index_path.c_str());
std::cout<<"SAVED INDEX TO "<<faiss_index_path<<std::endl;

Now when I try to load the index and use it as
faiss::IndexHNSWFlat* index;
faiss::Index *loaded = faiss::read_index(faiss_index_path.c_str());
index = static_castfaiss::IndexHNSWFlat*(loaded);
std::vector embed_vec(embed.begin(), embed.end());
std::vector labels(5);
std::vector distances(5);
index->search(1, embed_vec.data(), 5, distances.data(), labels.data());
where embed_vec is a 512 dimensional embedding, i get the following output
pure virtual method called
terminate called without an active exception
Aborted (core dumped)

Installed from: built from source.

Faiss compilation options:using mkl

Running on:

• CPU
  Interface:
• C++

[mdouze]

please don't use static_cast, always use dynamic_cast.

[Sha-x2-nk]

hey there. I also tried with dynamic_cast and it is still not working.
right now I am using index->search only without casting it to HNSWFlat index