Compiling and running PhantomHFE on Baobab

HPC Technical
1

A user asked us to install PhantomHFE. As this software isn’t available in EasyBuild below is a step-by-step guide to build the library and run it using SLURM as user.

This setup is based on the official PhantomHFE documentation.

:package: Step 1: Clone the Repository

git clone --recursive https://github.com/Encryptorion-Lab/phantom-fhe.git
cd phantom-fhe

:gear: Step 2: Load Required Modules

module load foss/2023a
module load CUDA/12.3.0
module load CMake/3.26.3
module load Python/3.11.3

:brick: Step 3: Configure and Build

mkdir build
cmake -S . -B build -DCMAKE_BUILD_TYPE=Release -DBUILD_PYTHON_BINDINGS=ON
make -j 4

The compiled Python module pyPhantom will be located in build/lib.
:test_tube: Step 4: Use the Python Module

To run a Python script with the module, export the path:

export PYTHONPATH=$PWD/lib:$PYTHONPATH

Test the module:

python3 -c "import pyPhantom; print('Phantom module loaded successfully')"

:receipt: Step 5: Run with SLURM (sbatch)

Create a SLURM job script, e.g. phantom_job.sbatch:

#!/bin/bash
#SBATCH --job-name=phantom_ckks
#SBATCH --output=phantom_ckks.out
#SBATCH --error=phantom_ckks.err
#SBATCH --time=00:10:00
#SBATCH --partition=shared-gpu
#SBATCH --gpus=1
#SBATCH --cpus-per-task=4

module load foss/2023a
module load CUDA/12.3.0
module load CMake/3.26.3
module load Python/3.11.3

cd /path/to/phantom-fhe/
export PYTHONPATH=$PYTHONPATH:build/lib

srun python3 python/examples/ckks.py

Replace /path/to/phantom-fhe with the actual path to your PhantomHFE repository.
:white_check_mark: Example Used: python/examples/ckks.py

2

Hi !
Thank you for creating this topic.
I have tried to follow these exact steps but I keep getting the following error when trying to import the module in Python :

ModuleNotFoundError: No module named 'pyPhantom'

I tried to import the libPhantom.so in another way but it only changes the problem. I tried the following :

>>> import sys
>>> sys.path.insert(0, "lib")
>>> import libPhantom
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: dynamic module does not define module export function (PyInit_libPhantom)

This was done in the PhantomFHE build folder.
I followed the steps described in the post above. Am I doing something wrong ?

3

First thing to try is to remove the conda initialization from your .bashrc in your home directory. Then logout and login and try again.

4

Hi,
I just tried removing the conda initialization from the .baschrc and login in again but it seems that didn’t change the outcome. I still get the two errors I mentioned in my last reply…

5

Hi @walter.jauch

it seems my instruction had a typo, probably a bad cut/paste sorry about that. Here is the correct line:

cmake -S . -B build -DCMAKE_BUILD_TYPE=Release -DPHANTOM_ENABLE_PYTHON_BINDING=ON
6

Hi !

That worked !! I can now run the examples with no errors ! Thanks a lot !!