I use faiss1.7.2 to write the index, but now I need to read it using faiss1.6.0, while faiss1.6.0 can't recognize the fourcc of the index.

[lj1995-computer-vision]

Summary

I use faiss1.7.2 to write the index, but now I need to read it using faiss1.6.0.

the fourcc of index is "Pcam", while faiss1.6.0 can't recognize it.

How can I transfer the index to "PcAm" version?

1.6.0write(PcAm)+1.7.2read: it's okay.
1.7.2write(Pcam)+1.6.0read: oh my god !

Platform

OS: Linux version 4.9.0-8-amd64 ([email protected]) (gcc version 6.3.0 20170516 (Debian 6.3.0-18+deb9u1) ) #1 SMP Debian 4.9.144-3 (2019-02-02)

py3.6.13,pip install faiss-cpu==x.x.x

Running on:

• [√ ] CPU
• GPU

Interface:

• C++
• [√ ] Python

[mdouze]

New versions of FAISS can read old formats, but not the other way round.

You can manually get the PCA matrix with https://github.com/facebookresearch/faiss/wiki/Python-C---code-snippets#how-can-i-get-the-pca-matrix-in-numpy-from-a-pca-object