FunkSVD: math, code, prediction, and validation

Understand basic FunkSVD and focus on validation cases

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Pic from Wiki[1]
Pic from Udacity course [2]
Pic from Udacity[2]
Pic from Udacity[2]
user_mat, movie_mat = FunkSVD(rating_mat, latent_features=12, learning_rate=0.005, iters=100)

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