java wrapper for facebook faiss
how to build this
#build faiss first
Firstly we need to compile from faiss code, please follow this doc
I started the experiment with a clean centos docker image, so I needed to install something beforehand
yum install -y epel-release
yum install -y git
yum install -y devtoolset-8.x86_64
yum install -y gcc.x86_64 gcc-c++.x86_64 libgcc.x86_64
yum install -y cmake3.x86_64 make
yum groupinstall "Development Tools" --skip-broken
yum install -y swig3.x86_64
yum install -y java-1.8.0-openjdk-devel.x86_64
yum install -y maven.noarch
yum install -y python-devel.x86_64
yum install -y python34-devel
yum install -y blas64.x86_64 blas64-devel.x86_64 blas64-static.x86_64
yum install -y lapack64.x86_64 lapack64-devel.x86_64 lapack64-static.x86_64can't do GPU building since I don't have gpu on the server.
enter faiss, run ./configure to check environment
./configure --without-cuda
make
make installit shows
/usr/bin/mkdir -p /usr/local/lib /usr/local/include/faiss
cp libfaiss.a libfaiss.so /usr/local/libthen faiss is built
#build java wrapper in root of faiss4j I chose faiss tagged 1.5.0 IT MIGHT NOT WORK WITH OTHER VERSIONS
swig -c++ -java -package com.thenetcircle.services.faiss -o swigfaiss4j.cpp -outdir src/main/java/com/thenetcircle/services/faiss/ -Doverride= -I../faiss-1.5.0/ swigfaiss4j.swigthis command uses swig to generate a cpp file swigfaiss4j.cpp which works as bridge between jni and faiss code, it also creates correspondent java definitions
now we need to compile this swigfaiss4j.cpp into lib for java to call, (I am just a java guy with little knowledge with compiling c/c++)
g++ -std=c++11 \
-fPIC \
-fopenmp \
-m64 \
-Wno-sign-compare \
-g \
-O3 \
-Werror \
-Wextra \
-msse4 \
-mpopcnt \
-z noexecstack \
-L /usr/local/lib \
-I ../faiss-1.5.0/ \
-I /usr/lib/jvm/java-1.8.0-openjdk/include/ \
-I /usr/lib/jvm/java-1.8.0-openjdk/include/linux/ \
-lfaiss \
swigfaiss4j.cpp \
-shared -o swigfaiss4j.soat last, libfaiss.so should be in current path -rwxr-xr-x 1 root root 3594624 Apr 16 09:20 swigfaiss4j.so
somehow, the java stub class has an error at com/thenetcircle/services/faiss/RangeSearchPartialResult.java:[64,14] error: method finalize() is already defined in class RangeSearchPartialResult
then let us run some test
LD_LIBRARY_PATH=. mvn test -Dtest=com.thenetcircle.services.faiss4j.tests.Examples#testLib 
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