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df_id = pd.read_csv('links.csv', sep=',') | |
idx_to_movie = {} | |
for row in df_id.itertuples(): | |
idx_to_movie[row[1]-1] = row[2] | |
total_movies = 9000 | |
movies = [0]*total_movies | |
for i in range(len(movies)): |
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import requests | |
import json | |
from IPython.display import Image | |
from IPython.display import display | |
from IPython.display import HTML | |
idx_to_movie = {} | |
for row in df_id.itertuples(): | |
idx_to_movie[row[1]-1] = row[2] |
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from sklearn.metrics import mean_squared_error | |
prediction = similarity_user.dot(train_matrix) / np.array([np.abs(similarity_user).sum(axis=1)]).T | |
prediction = prediction[test_matrix.nonzero()].flatten() | |
test_vector = test_matrix[test_matrix.nonzero()].flatten() | |
mse = mean_squared_error(prediction, test_vector) | |
print 'MSE = ' + str(mse) |
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similarity_user = train_matrix.dot(train_matrix.T) + 1e-9 | |
norms = np.array([np.sqrt(np.diagonal(similarity_user))]) | |
similarity_user = ( similarity_user / (norms * norms.T) ) | |
similarity_movie = train_matrix.T.dot(train_matrix) + 1e-9 | |
norms = np.array([np.sqrt(np.diagonal(similarity_movie))]) | |
similarity_movie = ( similarity_movie / (norms * norms.T) ) |
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train_matrix = rating_matrix.copy() | |
test_matrix = np.zeros(ratings_matrix.shape) | |
for i in xrange(rating_matrix.shape[0]): | |
rating_idx = np.random.choice( | |
rating_matrix[i, :].nonzero()[0], | |
size=10, | |
replace=True) | |
train_matrix[i, rating_idx] = 0.0 | |
test_matrix[i, rating_idx] = rating_matrix[i, rating_idx] |
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sparsity = float(len(ratings.nonzero()[0])) | |
sparsity /= (ratings.shape[0] * ratings.shape[1]) | |
sparsity *= 100 |
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df = pd.read_csv('ratings.csv', sep=',') | |
df_id = pd.read_csv('links.csv', sep=',') | |
df = pd.merge(df, df_id, on=['movieId']) | |
rating_matrix = np.zeros((df.userId.unique().shape[0], max(df.movieId))) | |
for row in df.itertuples(): | |
rating_matrix[row[1]-1, row[2]-1] = row[3] | |
rating_matrix = rating_matrix[:,:9000] |
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# Extra Trees Regressor | |
et_regr = ExtraTreesRegressor() | |
et_regr.fit(train_df_munged, label_df) | |
# Run prediction on training set to get a rough idea of how well it does. | |
y_pred = et_regr.predict(train_df_munged) | |
y_test = label_df | |
print("Extra Trees Regressor score on training set: ", rmse(y_test, y_pred)) |
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