Examples with RangeMapper utilities.RangeMapper used on opensource projects

Example 1 with RangeMapper

use of utilities.RangeMapper in project SimpleAsteroids by ljialin.

the class GeneMeanModel method generate.

public int generate() {
    double alpha = gainFactor / nValues;
    // add the numbers to ...
    StatSummary rangeStats = new StatSummary();
    // find the range
    // but ensure it's not too small
    rangeStats.add(0);
    rangeStats.add(1);
    for (StatSummary ss : stats) {
        if (ss.n() > 0) {
            rangeStats.add(ss.mean());
        }
    }
    // double range = rangeStats.max() - rangeStats.min();
    // having got the range we now map these values in to the new range
    // when computing the softmax function
    RangeMapper map = new RangeMapper(rangeStats.min(), rangeStats.max(), 0, alpha);
    // now put all the numbers through the map
    double totExp = 0;
    for (StatSummary ss : stats) {
        totExp += Math.exp(map.map(safeMean(ss)));
    // System.out.println("Summing exp denom: " + totExp + " <- " + map.map(safeMean(ss)));
    }
    // now pick one
    // System.out.println("Tot exp = " + totExp);
    double x = random.nextDouble() * totExp;
    double tot = 0;
    for (int i = 0; i < nValues; i++) {
        tot += Math.exp(map.map(safeMean(i)));
        if (x <= tot)
            return i;
    }
    throw new RuntimeException("Failed to return a valid option in GenePairedModel");
}