/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.uima.ruta.cde.utils;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Locale;
import org.apache.commons.math3.linear.ArrayRealVector;
import org.apache.commons.math3.stat.correlation.PearsonsCorrelation;
import org.apache.commons.math3.stat.correlation.SpearmansCorrelation;
public class EvaluationMeasures {
public static String getMeasureReport(ArrayList<Double[]> results) {
double[] x = new double[results.size()];
double[] y = new double[results.size()];
int index = 0;
for (Double[] resultPair : results) {
x[index] = resultPair[0];
y[index] = resultPair[1];
index++;
}
double mse = meanSquareError(x, y);
double spearmans = new SpearmansCorrelation().correlation(x, y);
double pearsons = new PearsonsCorrelation().correlation(x, y);
double cosine = cosine(x, y);
mse = round(mse);
spearmans = round(spearmans);
pearsons = round(pearsons);
cosine = round(cosine);
String report = "mse=" + mse + " spearmans=" + spearmans + " pearsons=" + pearsons + " cosine="
+ cosine;
return report;
}
public static double round(double d) {
DecimalFormat instance = (DecimalFormat) DecimalFormat.getInstance(Locale.US);
instance.applyPattern("#.####");
String format = instance.format(d);
try {
return Double.valueOf(format);
} catch (Exception e) {
}
return d;
}
public static double cosine(double[] a1, double[] a2) {
ArrayRealVector v1 = new ArrayRealVector(a1);
ArrayRealVector v2 = new ArrayRealVector(a2);
return v1.dotProduct(v2) / (v1.getNorm() * v2.getNorm());
}
public static double cosine(ArrayList<Double[]> results) {
double[] x = new double[results.size()];
double[] y = new double[results.size()];
int index = 0;
for (Double[] resultPair : results) {
x[index] = resultPair[0];
y[index] = resultPair[1];
index++;
}
return cosine(x, y);
}
public static double meanSquareError(double[] x, double[] y) {
double sum = 0;
for (int i = 0; i < x.length; i++) {
double xi = x[i];
double yi = y[i];
double diff = xi - yi;
sum += (diff * diff);
}
return sum / x.length;
}
}