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Update classes.py in knn #103

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Update classes.py in knn #103

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15 changes: 9 additions & 6 deletions scikits/crab/recommenders/knn/classes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -532,12 +532,15 @@ def estimate_preference(self, user_id, item_id, **params):

prefs = np.array([self.model.preference_value(to_user_id, item_id)
for to_user_id in nearest_neighbors])

prefs = prefs[~np.isnan(prefs)]
similarities = similarities[~np.isnan(prefs)]

prefs_sim = np.sum(prefs[~np.isnan(similarities)] *
similarities[~np.isnan(similarities)])

temp_prefs = [~np.isnan(prefs)]
temp_similarities = [~np.isnan(similarities)]
noNaN_indices = np.logical_and(temp_prefs, temp_similarities)

prefs_sim = np.sum(prefs[noNaN_indices[0] == True] *
similarities[noNaN_indices[0] == True])

similarities = similarities[~np.isnan(similarities)]
total_similarity = np.sum(similarities)

#Throw out the estimate if it was based on no data points,
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