Summary

I am compiling FAISS while building an alpine docker image. If I follow the installation steps from INSTALL.md, swigfaiss_avx2.py and _swigfaiss_avx2.so are missing in pythons site-packages/faiss-1.8.0-py3.12.egg/faiss.

If I install the C++ headers and libraries before installing the python package, the AVX2-enabled python module and shared library are copied to site-packages/faiss-1.8.0-py3.12.egg/faiss as expected.

If there is a dependency between step 3 and step 4, it should be reflected in the INSTALL.md.

Platform

OS: alpine:3.20 linux/amd64

Faiss version: 1f42e81

Installed from: Compiled

Faiss compilation options:
FAISS_ENABLE_GPU=OFF
BUILD_TESTING=OFF
CMAKE_BUILD_TYPE=Release
FAISS_OPT_LEVEL=avx2

Running on:

• CPU
• GPU

Interface:

• C++
• Python

Reproduction instructions

1. Create docker image using this Dockerfile
2. docker build --platform linux/amd64 -t missing-avx2 .
3. docker run -it missing-avx2 sh
4. ls -lah /usr/lib/python3.12/site-packages/faiss-1.8.0-py3.12.egg/faiss
5. Verify that swigfaiss_avx2.py is missing

For comparison, see this Dockerfile which reverses steps 3 and 4 from the installation instructions and therefore works.