For people interested in a cleaned-up, commented and de-obfuscated word2vec, I recently ported the original C code to Python [1].

My HN submission of this endeavour received no love, but I think it's worthwhile nevertheless as the Python code is not only more concise, readable and extendable, but the training's actually faster too [2].

[1] https://github.com/piskvorky/gensim/blob/develop/gensim/mode...

[2] http://radimrehurek.com/2013/09/word2vec-in-python-part-two-...