HEP machine-learning tools, for using the Yandex hep_ml library: https://github.com/arogozhnikov/hep_ml
Example: https://github.com/arogozhnikov/hep_ml/blob/master/notebooks/DemoReweighting.ipynb
"Reweighting with Boosted Decision Trees", by Alex Rogozhnikov. http://iopscience.iop.org/article/10.1088/1742-6596/762/1/012036/pdf
Example: https://github.com/arogozhnikov/hep_ml/blob/master/notebooks/sPlot.ipynb