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org.nd4j.linalg.fft.test.BaseFFTTest Maven / Gradle / Ivy
package org.nd4j.linalg.fft.test;
import static org.junit.Assert.*;
import org.junit.Test;
import org.nd4j.linalg.api.complex.IComplexNDArray;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.factory.Nd4j;
import org.nd4j.linalg.fft.VectorFFT;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Base class for FFTs
*/
public abstract class BaseFFTTest {
private static Logger log = LoggerFactory.getLogger(BaseFFTTest.class);
private double[] testVector = new double[]{
55.00000000
,0.00000000e+00
,-26.37586651
,-2.13098631e+01
,12.07106781
,2.58578644e+00
,-9.44674873
,1.75576651e+00
,5.00000000
,-6.00000000e+00
,-0.89639702
,5.89790214e+00
,-2.07106781
,-5.41421356e+00
,4.71901226
,2.83227249e+00
,-5.00000000
,-6.12323400e-15
, 4.71901226
,-2.83227249e+00
,-2.07106781
,5.41421356e+00
,-0.89639702
,-5.89790214e+00
, 5.00000000
,6.00000000e+00
,-9.44674873
,-1.75576651e+00
, 12.07106781
,-2.58578644e+00
, -26.37586651
,2.13098631e+01
};
private float[] testFloatVector = new float[]{ 55f , 0f , -5, 1.53884177e01f , -5f , 6.88190960e00f, -5f , 3.63271264e00f , -5f , 1.62459848e00f , -5f, 4.44089210e-16f, -5.f , -1.62459848e00f , -5.f , -3.63271264e00f , -5.f , -6.88190960e00f, -5.f , -1.53884177e01f};
@Test
public void testColumnVector() {
IComplexNDArray n = new VectorFFT(8).apply(Nd4j.complexLinSpace(1, 8, 8));
IComplexNDArray assertion = Nd4j.createComplex(new double[]
{36., 0., -4., 9.65685425, -4., 4, -4., 1.65685425, -4., 0., -4., -1.65685425, -4., -4., -4., -9.65685425
}, new int[]{8});
assertEquals(n,assertion);
}
@Test
public void testWithOffset() {
Nd4j.factory().setOrder('f');
INDArray n = Nd4j.create(Nd4j.linspace(1, 30, 30).data(),new int[]{3,5,2});
INDArray swapped = n.swapAxes(n.shape().length - 1,1);
VectorFFT op = new VectorFFT(5);
INDArray firstSlice = swapped.slice(0).slice(0);
IComplexNDArray test = Nd4j.createComplex(firstSlice);
IComplexNDArray testNoOffset = Nd4j.createComplex(new double[]{1,0,4,0,7,0,10,0,13,0},new int[]{5});
assertEquals(op.apply(testNoOffset),op.apply(test));
}
}
