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Copy pathUtil.java
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60 lines (53 loc) · 1.16 KB
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package util;
import java.util.Collections;
import java.util.List;
import java.util.Random;
import matrix.Matrix;
public class Util {
public static int pickIndexFromRandomVector(Matrix probs, Random r) throws Exception {
double mass = 1.0;
for (int i = 0; i < probs.w.length; i++) {
double prob = probs.w[i] / mass;
if (r.nextDouble() < prob) {
return i;
}
mass -= probs.w[i];
}
throw new Exception("no target index selected");
}
public static double median(List<Double> vals) {
Collections.sort(vals);
int mid = vals.size()/2;
if (vals.size() % 2 == 1) {
return vals.get(mid);
}
else {
return (vals.get(mid-1) + vals.get(mid)) / 2;
}
}
public static String timeString(double milliseconds) {
String result = "";
int m = (int) milliseconds;
int hours = 0;
while (m >= 1000*60*60) {
m -= 1000*60*60;
hours++;
}
int minutes = 0;
while (m >= 1000*60) {
m -= 1000*60;
minutes++;
}
if (hours > 0) {
result += hours + " hours, ";
}
int seconds = 0;
while (m >= 1000) {
m -= 1000;
seconds ++;
}
result += minutes + " minutes and ";
result += seconds + " seconds.";
return result;
}
}