read more https://arxiv.org/abs/1705.10743
https://towardsdatascience.com/notes-on-the-cramer-gan-752abd505c00
read this for histogram discrepances https://stats.stackexchange.com/questions/7400/how-to-assess-the-similarity-of-two-histograms
here are nice notes about plotting with matplotlib and seaborn https://www.oreilly.com/library/view/python-data-science/9781491912126/ch04.html#fig0431 see also: https://python-graph-gallery.com/2d-density-plot/