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import pandas as pd ratings_cols = ['user_id', 'movie_id', 'rating'] ratings = pd.read_csv('u.data', sep='\t', names=ratings_cols, usecols=range(3)) movies_cols = ['movie_id', 'title'] movies = pd.read_csv('u.item', sep='|', names=movies_cols, usecols=range(2)) ratings = pd.merge(ratings, movies) X movieRatings = ratings.pivot_table(index=['user_id'],columns=['title'],values='rating')
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starWarsRatings = movieRatings['Star Wars (1977)'] similarMovies = movieRatings.corrwith(starWarsRatings) similarMovies = similarMovies.dropna() df = pd.DataFrame(similarMovies)
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ratingsCount = 100 movieStats = ratings.groupby('title').agg({'rating': [np.size, np.mean]}) popularMovies = movieStats['rating']['size'] >= ratingsCount movieStats[popularMovies].sort_values([('rating', 'mean')], ascending=False)[:15]
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df = movieStats[popularMovies].join(pd.DataFrame(similarMovies, columns=['similarity'])) df.sort_values(['similarity'], ascending=False)[:15]
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userRatings = ratings.pivot_table(index=['user_id'],columns=['title'],values='rating') corrMatrix = userRatings.corr(method='pearson', min_periods=100)
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myRatings = userRatings.loc[0].dropna() simCandidates = pd.Series() for i in range(0, len(myRatings.index)): # , sims = corrMatrix[myRatings.index[i]].dropna() # , sims = sims.map(lambda x: x * myRatings[i]) # simCandidates = simCandidates.append(sims) simCandidates.sort_values(inplace = True, ascending = False)
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simCandidates = simCandidates.groupby(simCandidates.index).sum() simCandidates.sort_values(inplace = True, ascending = False)
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filteredSims = simCandidates.drop(myRatings.index)
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