Valerolaparra

There is something with the probability estimation that makes it take too long. I train a model of 3k features with 50k samples and try to compute the probability for...

Right now the inverse is not perfect. It means that you dont get the same input, i.e. `x' = f^-1(f(x)) x'=!x.` For instance you can see it in this [notebook](https://github.com/IPL-UV/rbig/blob/master/notebooks/rbig_demo.ipynb)...