org.lenskit.knn.item

Interface NeighborhoodScorer

All Known Implementing Classes:

SimilaritySumNeighborhoodScorer, WeightedAverageNeighborhoodScorer

@DefaultImplementation(value=WeightedAverageNeighborhoodScorer.class)
public interface NeighborhoodScorer

Compute scores from neighborhoods and score vectors.

This interface encapsulates aggregating user scores and item similarities into a final score. The neighborhood is pre-filtered to only contain items for which scores are available, and truncated to the neighborhood size, so all functions implementing this interface need to do is accumulate scores.

Method Summary

Modifier and Type	Method and Description
void	score(long item, Long2DoubleMap neighbors, Long2DoubleMap scores, ItemItemScoreAccumulator accum) Compute a score based on similar neighbors and their corresponding scores.

Method Detail

score

void score(long item,
           Long2DoubleMap neighbors,
           Long2DoubleMap scores,
           ItemItemScoreAccumulator accum)

Compute a score based on similar neighbors and their corresponding scores.

Parameters:

item - The item ID to score.

neighbors - A vector of neighbors with similarity measures.

scores - A vector of item scores. It should contain a score for every item in neighbors.

accum - An accumulator to receive the score computed by this method.