Out of bound on a different corpus

[Ricocotam]

Hey, I've been trying to use your code (which is amazingly clear and easy to understand, great job and thanks a lot) on a different corpus (this one) but I got an issue on line 102 of word2vec.lua

I don't know why but word_index had a value over vocab_size (in this case vocab_size is 1169). So I fixed it my changing line 104 :

• from "if word_index > self.vocab_size then"
• to "if word_index >= self.vocab_size then"

No PR, extremely simple fixing, but I can't figure out if it changes anything.

Thanks again for your code !