HistogramBinTest.java

package org.deeplearning4j.ui.weights;

import org.junit.Before;
import org.junit.Test;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.factory.Nd4j;

import java.math.BigDecimal;

import static org.junit.Assert.assertEquals;

/**
 * @author raver119@gmail.com
 */
public class HistogramBinTest {

    @Before
    public void setUp() throws Exception {

    }

    @Test
    public void testGetBins() throws Exception {
        INDArray array = Nd4j.create(new double[] {0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.0});

        HistogramBin histogram = new HistogramBin.Builder(array).setBinCount(10).build();

        assertEquals(0.1, histogram.getMin(), 0.001);
        assertEquals(1.0, histogram.getMax(), 0.001);

        System.out.println("Result: " + histogram.getBins());

        assertEquals(2, histogram.getBins().getDouble(9), 0.001);
    }

    @Test
    public void testGetData1() throws Exception {
        INDArray array = Nd4j.create(new double[] {0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.0});

        HistogramBin histogram = new HistogramBin.Builder(array).setBinCount(10).build();

        assertEquals(0.1, histogram.getMin(), 0.001);
        assertEquals(1.0, histogram.getMax(), 0.001);

        System.out.println("Result: " + histogram.getData());

        assertEquals(10, histogram.getData().size());
    }

    @Test
    public void testGetData2() throws Exception {
        INDArray array = Nd4j.create(new double[] {-1.0f, -0.50f, 0.0f, 0.50f, 1.0f, -1.0f, -0.50f, 0.0f, 0.50f, 1.0f});

        HistogramBin histogram = new HistogramBin.Builder(array).setBinCount(10).build();

        assertEquals(-1.0, histogram.getMin(), 0.001);
        assertEquals(1.0, histogram.getMax(), 0.001);

        System.out.println("Result: " + histogram.getData());

        assertEquals(10, histogram.getData().size());

        assertEquals(2, histogram.getData().get(new BigDecimal("1.00")).get());
    }

    @Test
    public void testGetData4() throws Exception {
        INDArray array = Nd4j.create(new double[] {-1.0f, -0.50f, 0.0f, 0.50f, 1.0f, -1.0f, -0.50f, 0.0f, 0.50f, 1.0f});

        HistogramBin histogram = new HistogramBin.Builder(array).setBinCount(50).build();

        assertEquals(-1.0, histogram.getMin(), 0.001);
        assertEquals(1.0, histogram.getMax(), 0.001);

        System.out.println("Result: " + histogram.getData());

        assertEquals(50, histogram.getData().size());

        assertEquals(2, histogram.getData().get(new BigDecimal("1.00")).get());
    }
}