Implementations store item-item preference diffs for a {@link org.apache.mahout.cf.taste.impl.recommender.slopeone.SlopeOneRecommender}. It actually does a bit more for this implementation, like listing all items that may be considered for recommendation, in order to maximize what implementations can do to optimize the slope-one algorithm.
@see org.apache.mahout.cf.taste.impl.recommender.slopeone.SlopeOneRecommender
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