Recommendation writers and readers with a common format.
Reader for Mahout-like recommendations.
Simple format for recommendations: tab-separated user-item-score triplets, grouping first by user (not necessarily in order) and then by decreasing order of score.
Reader for TREC-like recommendations.
Reader for formats where recommendations are stored in tuples, one each line.
Format similar to SimpleRecommendationFormat, but files are zipped and scores can be omitted when writing and reading for higher performance when they are not needed and only order matters.
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