Introduction to machine learning
https://www.coursera.org/learn/supervised-learning/home/welcome
https://github.com/Yorko/mlcourse.ai
https://github.com/esokolov/ml-course-hse
http://scikit-learn.org/stable/auto_examples/classification/plot_digits_classification.html
https://habr.com/company/ods/blog/322534/#metod-blizhayshih-sosedey
http://scikit-learn.org/stable/modules/naive_bayes.html
http://scikit-learn.org/stable/modules/generated/sklearn.model_selection.GridSearchCV.html