incorporated Trevor Cohn's optimisations (from nltk_contrib/unimelb/tacohn/hmm/numeric.py) as suggested by Philippe Muller
incorporated Trevor Cohn's optimisations (from nltk_contrib/unimelb/tacohn/hmm/numeric.py) as suggested by Philippe Muller

svn/trunk@4044

nltk/nltk,nltk/nltk,nltk/nltk