@Test
public void testRegressionNACalc() {
ExtraTrees et = getET(10, 5, false);
ExtraTrees etw = getET(10, 5, true);
double var, mean;
mean = 4.0 / 10.0;
var = 0.6 * Math.pow(mean, 2) + 0.4 * Math.pow(1 - mean, 2);
assertEquals(var, et.get1NaNScore(AbstractTrees.seq(10)), 1e-6);
mean = 3.0 / 9.0;
var = 6 / 9.0 * Math.pow(mean, 2) + 3 / 9.0 * Math.pow(1 - mean, 2);
assertEquals(var, et.get1NaNScore(AbstractTrees.seq(9)), 1e-6);
// testing NaN counts:
CutResult cr;
cr = new CutResult();
et.calculateCutScore(AbstractTrees.seq(9), 2, 0.5, cr);
assertEquals(3.0, cr.nanWeigth, 1e-6);
cr = new CutResult();
et.calculateCutScore(AbstractTrees.seq(9), 1, 0.5, cr);
assertEquals(0.0, cr.nanWeigth, 1e-6);
// testing weights:
cr = new CutResult();
etw.calculateCutScore(AbstractTrees.seq(9), 2, 0.5, cr);
assertEquals(1.5, cr.nanWeigth, 1e-6);
}
/**
* @param ndata
* @param ndim
*/
public static ExtraTrees getET(int ndata, int ndim, boolean useWeights) {
double[] output = new double[ndata];
Matrix m = new Matrix(ndata, ndim);
// generate values for all outputs
for (int row = 0; row < output.length; row++) {
m.set(row, 1, row / (double) output.length);
m.set(row, 2, 0.5);
if (row == 5 || row == 6 || row == 7) {
m.set(row, 2, Double.NaN);
}
output[row] = m.get(row, 1) > 0.55 ? 1 : 0;
}
ExtraTrees et = new ExtraTrees(m, output);
et.setHasNaN(true);
if (useWeights) {
double[] w = new double[ndata];
for (int i = 0; i < w.length; i++) {
w[i] = 0.5;
}
et.setWeights(w);
}
return et;
}
@Test
public void testRegressionNALearn() {
int ndim = 5;
ExtraTrees et = getET(100, ndim, false);
ExtraTrees etw = getET(100, ndim, true);
et.learnTrees(3, 3, 5);
etw.learnTrees(3, 3, 5);
double[] x = new double[ndim];
for (int i = 0; i < x.length; i++) {
x[i] = Double.NaN;
}
double[] val;
val = et.getValues(new Matrix(x, 1, ndim));
assertTrue(Double.isNaN(val[0]));
val = etw.getValues(new Matrix(x, 1, ndim));
assertTrue(Double.isNaN(val[0]));
// checking if getRange works with NaN
double[] col2 = ((Matrix) et.input).getCol(2);
double[] range2 = AbstractTrees.getRange(col2);
assertEquals(0.5, range2[0], 1e-6);
assertEquals(0.5, range2[1], 1e-6);
}
