Nowadays ROOT and PyROOT are de-facto standard tools for performing physics analysis. The Ostap project is a community-driven initiative aiming to provide more user friendly and more intuitive interface to ROOT and PyROOT and extending the existing functionality.
Project started in 2009 from the private collections of python functions used in Kali - framework for calibration of LHCb electromagnetic calorimeter. A lot of functionality is picked from Bender project - python based physics analysis environment used in LHCb experiemnt. Till Autumn 2016 the project was a part of LHCb software suit and with great success has been used for preparation of approximately 30 physics papers. A standalone, LHCb independent version, has appeared at start of 2017
Key features include:
- Very easy manipulations with ROOT and RooFit objects: histograms, trees, datasets, etc
- Very easy interface to RooFit machinery
- Extended set of models.PDFs for RooFit
- Powerful, pickle-based persistency for object
- Interactive
ostapanalysis environment
There are several possibilities to start working with Ostap, you can build Ostap on the Linux or lxplus/7 and also run the docker container.
Ostap requires the python2 version >2.7 or python3. You need to provide ROOTSYS environment for building the library. The library should be built with the same compiler version and C++ standard as was used to build ROOT.
At lxplus/7 you can do it with several LCG versions (94,95). Check on which platform is the preferred version of LCG located and run LbLogin, for instance for LCG 95 and x86_64-centos7-gcc8-opt:
LbLogin -c x86_64-centos7-gcc8-opt
source /cvmfs/sft.cern.ch/lcg/views/LCG_95/${CMTCONFIG}/setup.sh
After setting the enviroments clone the latest released version and build Ostap package
git clone —-branch <latest tag> git://github.com/OstapHEP/ostap.git
cd ostap
mkdir build
cd build
cmake .. -DCMAKE_INSTALL_PREFIX=<INSTALL_DIRECTORY>
make -j8
make install
source <INSTALL_DIRECTORY>/thisostap.sh
For the latest tag check the page https://github.com/OstapHEP/ostap/releases
We also provided Dockerfile to build the OstapHep image. You can run Ostap interactively using the command line or via Docker Desktop which is available for MacOS and Windows. To create the docker image from the Ostap directory run:
sudo docker build --network host -t <dockerID>/ostaphep:latest .
Run the image iteractively
sudo docker run -e DISPLAY=$DISPLAY -v /tmp/.X11-unix:/tmp/.X11-unix -v ${WORKDIR_PATH}/work_dir:/work_dir -it <dockerID>/ostaphep:latest
To know more about docker, please check the documentation: https://docs.docker.com/.
OstapHep is now available on the conda-forge channel https://github.com/conda-forge/ostaphep-feedstock. You can get ostap with conda using the following steps:
Install mininconda
wget http://repo.continuum.io.miniconda/Miniconda3-latest-Linux-x86_64.sh
sh Miniconda3-latest-Linux-x86_64.sh
Set the conda environments
source path-to-miniconda/etc/profile.d/conda.sh
Add the conda-forge to your channels
conda config --add channels conda-forge
Check which versions are available
conda search ostaphep --channel conda-forge
Create an environment with a specific version of python
conda create --name ostap-env ostaphep python=3.7
To activate or deactivate the ostap environment use the following command
conda activate ostap-env
conda deactivate
The list of available version you can find here: https://anaconda.org/conda-forge/ostaphep/files. To know more about conda-forge, please visit conda page: https://conda-forge.org.