Model diagnostics support for ETM

[contefranz]

This is more of a feature request rather than an issue.

I was wondering if you are planning to implement any support for model diagnostics of topic models in embedded spaces. The paper I am referring to can be found here. There is an implementation of the original code in R here.

It seems that the R package does not support any of such things that seem to be well implemented in the original Python code.

Thanks!

[doug-friedman]

Let me look into this, but it seems like an interesting idea.