def RatingHitRate(topNPredicted, leftOutPredictions):
        hits = defaultdict(float)
        total = defaultdict(float)

        # For each left-out rating
        for userID, leftOutMovieID, actualRating, estimatedRating, _ in leftOutPredictions:
            # Is it in the predicted top N for this user?
            hit = False
            for movieID, predictedRating in topNPredicted[int(userID)]:
                if (int(leftOutMovieID) == movieID):
                    hit = True
                    break
            if (hit) :
                hits[actualRating] += 1

            total[actualRating] += 1

        # Compute overall precision
        for rating in sorted(hits.keys()):
            print (rating, hits[rating] / total[rating])