fixes for Word2Vec for Python 3

[LinuxPersonEC]

Thanks to https://zhuanlan.zhihu.com/p/150579437

Change this line:

# Evaluation Parameters.
eval_words = [b'five', b'of', b'going', b'hardware', b'american', b'britain']

and https://stackoverflow.com/a/53401158/7606730
replace xrange with range