Reconstructing all vectors with Arbitrary ID mapping

[Isaac-the-Man]

Summary

How do I reconstruct all vectors from an Index with ID mapping enabled? The IDs are non-contiguous arbitrary integers in my case, and calling reconstruct_n(0, index.ntotal) throws a Fatal Python Error which I assume is because faiss is reconstructing the vectors based on my non-contiguous ID mapping.

If I understand this correctly, I should be able to get pass the ID maps and call reconstruct_n directly on the Index, which I assume still uses incremental IDs starting at 0.

I'm aware that I can always loop through the IDs and call reconstruct on each item, but I believe there must be a better way?

Platform

OS:

Faiss version:

Installed from:

Faiss compilation options:

Running on:

• CPU
• GPU

Interface:

• C++
• Python

Reproduction instructions

[mdouze]

Please use reconstruct_batch with the ids you want to reconstruct.

[Isaac-the-Man]

Thanks for the quick response, reconstruct_batch works perfectly for me!

I'd still like to know if there is any way to bypass ID Mapping and call all the reconstruct_x methods directly on the default incremental ID?