Add BDT process for the flow

[wuctlby]

Hi, @stefanopolitano. This is the available version for the post-processing, and I tested it locally. The code's framework is based on the work of Fabrizo, Biao, Mingyu, and other developers at DmesonAnalysis. Maybe it still needs to be implemented for other particles. Please let me know if you have other suggestions or comments, and then we can develop it further.

• run_cutvar.sh
  the script controls the whole process, the only thing we need to do is modify this bash script

• make_yaml_for_ml.py
  produces the .yaml file which is used when projecting the MC

• cut_variation.py
  applies the BDT cut on data

• proj_thn_mc.py
  projects the MC, including applying the BDT cut and the pT-weights

• compute_efficiency.py
  computes the efficiency

• get_vn_vs_mass.py
  extracts the v2 by the simultaneous fit

• compute_frac_cut_var.py
  computes the fraction by the cut variation method

• ComputeDataDriFrac_flow.py
  computes the fraction by data-driven method

• ComputeV2vsFDFrac.py
  computes the v2 vs fraction by a linear fit

• run_cutvar.py
  run the whole BDT process

#TODO:

• uncorrelated cut
• remove the make_yaml_for_ml.py
• optimize the logic of the method of calculating the cut

[Marcellocosti]

Thanks a lot @wuctlby, I'll test the code as soon as it is merged!

[wuctlby]

Thanks a lot @wuctlby, I'll test the code as soon as it is merged!

Thanks to you Marcel! it is very important to check with another particle. Btw, I am adding the method of the uncorrelated cut, and adding some debug print.