ClassicSVfit

Latest version of SVfit_standalone algorithm Python instructions: https://github.com/SVfit/ClassicSVfit/blob/fastMTT_2024/python/README.md

Installation instructions with CMSSW

The SVfitPerformanceStudies package has been tested with CMSSW 9_4_4. It depends on the following other packages: TauAnalysis/SVfitTF

In order to install the code, execute:

cmsrel CMSSW_9_4_4
cd CMSSW_9_4_4/src
cmsenv
git clone https://github.com/SVfit/ClassicSVfit TauAnalysis/ClassicSVfit -b fastMTT_19_02_2019
git clone https://github.com/SVfit/SVfitTF TauAnalysis/SVfitTF
cd $CMSSW_BASE/src
scram b -j 4

In case of compilation problems, please sutmitt an issue on https://github.com/SVfit/ClassicSVfit/issues

Running instructions

• Presentation, slides 2+3
• Example(s)

Installation instructions without CMSSW

Installation instructions: It is possible to build the software without CMSSW framework if the following prerequisites are satisfied (oldest software version the instructions were tested with):

ROOT (6.10/3 or newer)
GCC (6.3 or newer)

In order to install the code, execute:

# git clone https://github.com/SVfit/ClassicSVfit TauAnalysis/ClassicSVfit -b fastMTT_19_02_2019
git clone https://github.com/oponcet/ClassicSVfit.git TauAnalysis/ClassicSVfit -b fastMTT_19_02_2019
# It will become the same as the above commented line after a PR
export LIBRARY_PATH=$LIBRARY_PATH:$PWD/TauAnalysis/ClassicSVfit/lib
make -f TauAnalysis/ClassicSVfit/Makefile -j4

You can try running SVFit with :

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$PWD/TauAnalysis/ClassicSVfit/lib
./TauAnalysis/ClassicSVfit/exec/testClassicSVfit

If everything goes right, this should produce a root file.

ClassicSVFit/FastMTT in Python from C++ needs a Wrapper 🎁

TThis wrapper has been developed with the purpose of using it with the ColumnFlow columnar Python-based framework. In order to use ClassicSVFit in Python, the pybind11 wrapper has been used. The wrapper for the different classes can be found here : pybind_wrapper.cpp.

The cloned ClassicSVFit already contains the pybind11 and the wrapper itself. A few more things to modify [hard-coded, please be patient !!!]

open TauAnalysis/ClassicSVfit/wrapper/CMakeList.txt
change L10 and L33

Now, this wrapper needs to be compiled with :

export LIBRARY_PATH=$LIBRARY_PATH:$PWD/TauAnalysis/ClassicSVfit/lib
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$PWD/TauAnalysis/ClassicSVfit/lib
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.30.04/x86_64-centosstream9-gcc113-opt/lib/
cmake -S TauAnalysis/ClassicSVfit/wrapper/ -B TauAnalysis/ClassicSVfit/wrapper/
make -C TauAnalysis/ClassicSVfit/wrapper/

It should produce a .so file which can be used as a module in Python. For example you can import it like :

from modules.extern.TauAnalysis.ClassicSVfit.wrapper.pybind_wrapper import *