Example usage for org.apache.commons.math3.distribution NormalDistribution sample

Introduction

In this page you can find the example usage for org.apache.commons.math3.distribution NormalDistribution sample.

Prototype

@Override
public double sample() 

Source Link

Usage

From source file:org.ranksys.novdiv.reranking.DitheringReranker.java

@Override
public int[] rerankPermutation(Recommendation<U, I> recommendation, int maxLength) {
    List<Tuple2od<I>> items = recommendation.getItems();
    int M = items.size();
    int N = min(maxLength, M);

    if (variance == 0.0) {
        return getBasePerm(N);
    }/*from   w ww.j av  a  2s. co m*/

    NormalDistribution dist = new NormalDistribution(0.0, sqrt(variance));

    IntDoubleTopN topN = new IntDoubleTopN(N);
    for (int i = 0; i < M; i++) {
        topN.add(M - i, log(i + 1) + dist.sample());
    }
    topN.sort();

    return topN.stream().mapToInt(e -> M - e.v1).toArray();

}

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