Prerequisites

Git setup

In case you’re working with an older version of git, we suggest to set default branch name to main:

git config --global init.defaultBranch main

tea only depends on ROOT libraries, you need cmake ≥3.14, and optionally correctionlib if you’re planning on applying CMS scale factors.

Below you can find instructions for some common situations, but basically you can just install ROOT your prefered way.

The only important thing is to use lxplus9, where new versions of cmake, GCC, etc. are available by default. Simply login using:

ssh -Y username@lxplus9.cern.ch

Optionally, install correctionlib, which is a package that helps us to deal with scale factors and other corrections:

python3 -m pip install correctionlib --no-binary=correctionlib

In case you see some errors related to correctionlib, you can also try installing the latest development version instead (more information here):

python3 -m pip install git+https://github.com/cms-nanoAOD/correctionlib.git

If you prefer to use a Conda environemnt, make sure you have Miniconda or Anaconda installed on your machine - see Conda installation instructions.

Then, create a new conda environment for tea (this may take a longer while):

conda create -c conda-forge --name tea root python=3.8
conda activate tea

The activate command has to be repeated in each new session, or added to ~/.bash_profile.

Optionally, install correctionlib, which is a package that helps us to deal with scale factors and other corrections:

python3 -m pip install correctionlib --no-binary=correctionlib

In case you see some errors related to correctionlib, you can also try installing the latest development version instead (more information here):

python3 -m pip install git+https://github.com/cms-nanoAOD/correctionlib.git

If you’re working on NAF, you can use an existing Conda environment:

conda activate /nfs/dust/cms/user/jniedzie/conda/tea

Also in this case, the activate command has to be repeated in each new session, or added to ~/.bash_profile.