Install issue on Linux Ubuntu

[IanQS]

Hi all! These are the exact commands I'm running:

Installation

Installing Openfhe-dev

git clone git@github.com:openfheorg/openfhe-development.git
cd openfhe-development
mkdir build
cd build
make -j N  # number of processors - 26 in my case
sudo make install

I then verify that it is installed by running

cd bin/examples/pke
./simple-real-numbers

Installing OpenFHE-python (within a conda env)

git clone git@github.com:openfheorg/openfhe-python.git
cd openfhe-python
mkdir build
cd build
cmake .. -DPYTHON_EXECUTABLE_PATH=$CONDA_PREFIX/bin/python
make -j 26
sudo make install

then, within build, I run

mkdir lib
mv *.so lib
conda develop lib

I have verified that Openfhe-python's SO files have been "linked"

import sys
for p in sys.path:
    print(p)

which outputs

/home/iq/anaconda3/lib/python311.zip
/home/iq/anaconda3/lib/python3.11
/home/iq/anaconda3/lib/python3.11/lib-dynload
/home/iq/anaconda3/lib/python3.11/site-packages
/home/iq/openfhe-python/build/lib

---

The issue

When I run something like python function-evaluation.py I see

File "/home/iq/openfhe-python/examples/pke/function-evaluation.py", line 1, in <module>
    from openfhe import *
ImportError: libOPENFHEpke.so.1: cannot open shared object file: No such file or directory

It's not clear to me what the issue is and if it is an issue on the OpenFHE-dev end. I don't think it is, just because I managed to run an example specifically a PKE example

---

Additional Information

Distributor ID: Ubuntu
Description:    Ubuntu 22.04.3 LTS
Release:        22.04
Codename:       jammy

[reneroliveira]

Have you tried to check the command which python to see if it matches with the anaconda python paths?

[IanQS]

Yeap! Verified

[yspolyakov]

PYTHONPATH should include the path to OpenFHE .so files for Python to work. In other words, @IanQS, you need to add

export PYTHONPATH = (path_to_OpenFHE_so_files):$PYTHONPATH

The documentation should be updated to mention both PYTHONPATH and LD_LIBRARY_PATH.

[IanQS]

Amazing! Confirmed that the solution works for the system-level install. I haven't tested the conda approach yet, but I'm confused why conda develop didn't work.... AFAIK it does the same thing(?) Rener, keep me honest here

Also, the original error made me think it was a C++/ OpenFHE installation-path issue, how strange

[reneroliveira]

Actually, I don't understand exactly what conda develop does. That was your suggestion to the documentation. In my machine I never need to run that, everything works fine with sudo make install and specifying the python conda path to cmake

[IanQS]

Ahh, my bad. I'll figure out how to make it work with conda later on and open a new PR to correct this. I'm closing this issue now - if there's any follow ups feel free to reopen