Progress

• Some refactoring for the text
• Added/finished the following strategies: most controversial, entropy, items with worst/best predictions

TODO:

• read it one more time in the morning.
• talk the professor and start testing.
• acquire the rating matrix for testing.
• ask again about the strategy of "items more correlated with best predictions". What is exactly correlation between two items? is it pearson/cosine similarity? something else?