mf908

https://github.com/RaRe-Technologies/gensim/blob/develop/gensim/models/ldamodel.py The log_perplexity function where it says: > Calculate and return per-word likelihood bound, using a chunk of documents as evaluation corpus. Also output the calculated statistics, including the perplexity=2^(-bound),...

If you look at the bound function in ldamodel.py all of the functions there utilize natural log as opposed to base 2.