I am trying to train a classifier to recognize signals. I generated the plot for the TMVA overtraining check. It looks like below:
I am wondering is this due to my bad configuration or low statistics (small number of events).
Besides the problem above, I am always wondering the useness of spectator variable. I saw the description that spectators will not be used in training but will appear in test tree. What is it intended for? Why do people want to add spectators and how will they use spectators?
Due to platform constraints, I can only work with ROOT v6.06/1, gcc530, CentOS7.