links I find useful:
http://stackoverflow.com/questions/28277137/how-to-convert-datatypeobject-to-float64-in-python
http://stackoverflow.com/questions/17530542/how-to-add-pandas-data-to-an-existing-csv-file
http://stackoverflow.com/questions/13703720/converting-between-datetime-timestamp-and-datetime64
http://stackoverflow.com/questions/3028642/regular-expression-for-letters-numbers-and
http://stackoverflow.com/questions/39492251/python-pandas-dataframe-rows-to-columns
http://stackoverflow.com/questions/40029996/pythonic-way-to-fill-bag-of-words
https://en.wikipedia.org/wiki/Precision_and_recall
git installing
https://stackoverflow.com/questions/8247605/configuring-so-that-pip-install-can-work-from-github
https://stackoverflow.com/questions/20101834/pip-install-from-git-repo-branch
https://stackoverflow.com/questions/14149422/using-pip-behind-a-proxy
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