org.lenskit.eval.traintest.metrics

Interface Discount

All Known Implementing Classes:

ExponentialDiscount, LogDiscount

public interface Discount

Interface for discounts for rank evaluation.

Method Summary

Modifier and Type	Method and Description
double	discount(int rank) Compute the discount for a rank.

Method Detail

discount

double discount(int rank)

Compute the discount for a rank.

Parameters:

rank - The rank (with the first item having rank 1).

Returns:

The discount. This discount will be multiplied by the value, so it should generally go towards 0 as the rank increases.