for use with root 6.10.04 (CMSSW_9_3_2)
setup a cmssw release cmsrel CMSSW_9_3_2 cd CMSSW_9_3_2/src cmsenv
get the repository git clone https://github.com/saraheno/ToyRegress.git
cd to the area cd ToyRegress
make the toy data make ./main
run the regression root.exe > .L TMVARegression.C > TMVARegression("BDT")
to use the result root.exe > .L TMVARegressionApplication.C >TMVARegressionApplication("BDT")