`faiss` issue on install

[bkj]

When I try to follow the "install from source" directions in the README, I hit the following error:

software/graphvite/include/instance/visualization.cuh:25:36: fatal error: faiss/gpu/GpuIndexFlat.h: No such file or directory

Any idea how to solve? I tried installing faiss in various different ways but wasn't able to get it running.

Thanks! ~ Ben

[KiddoZhu]

The recommended practice is to let GraphVite automatically compile faiss from source (if you have Internet access).

Otherwise, you can manually specify the path to faiss repo by cmake .. -DFAISS_PATH=/path/to/faiss. This requires faiss to be compiled in advance.

Actually you can skip faiss if you don't need the visualization application. You can comment out all faiss related lines in CMakeLists.txt and visualization.cuh. We may add a shortcut to such skip in the future.

[bkj]

OK thanks. It seems like "let GraphVite automatically compile faiss from source" isn't working out-of-the-box per the error above -- is there some flag or path that needs to be set there?

[KiddoZhu]

The conda routine always compiles in that way. I think it should work.

Could you check the following steps?

• Whether faiss repo is present in external/
• What's the faiss path detected by cmake? You may use cat build/CMakeCache.txt | grep FAISS

[bkj]

• faiss appears to be present in external
• cat build/CMakeCache.txt | grep FAISS finds nothing

[KiddoZhu]

It seems good. I also checked CMakeLists.txt and didn't find any obvious bug.

Can you find these two files? They should present if faiss has been compiled automatically by graphvite.

• build/faiss/include/faiss/gpu/GpuIndexFlat.h
• build/faiss/lib/libfaiss.so

If they are present, can you add this line at the bottom of CMakeLists.txt and re-run cmake ..? message(STATUS ${PROJECT_BINARY_DIR})

This is expected to output the full path of build/. As you may find, we have already added ${PROJECT_BINARY_DIR}/faiss/include in CMakeLists.txt:104.