Inverse predict for FeatureNormalizer

[SebastianCallh]

It is often very useful to invert feature normalization. I think it would be a very nice addition to the FeatureNormalizer to add an inverse function that does exactly that.

[ToucheSir]

Not a direct solution, but IIRC https://github.com/invenia/FeatureTransforms.jl supports inverse transforms.

[SebastianCallh]

Thanks for the link, that looks like a neat package!