piskvorky/gensim — Issue #57: interpretation of LDA parameters 
Author: piskvorky
Created: 2011-10-15 22:19:12+00:00
State: open

There was an interesting post by Matt Hoffman in the `topic-models` mailing list yesterday:
https://lists.cs.princeton.edu/pipermail/topic-models/2011-October/001600.html

Apparently there is an easier way to estimate beta and theta: simply normalize rows in lambda and gamma, respectively.

Currently, gensim does the more roundabout way of exp^{E[log lambda]} (resp. gamma), but according to Matt, the normalization is "more common".

Switching to the simple normalization is trivial code-wise (and will result in faster code), but inform users of the change first -- it gives different results!