Java example source code file (DataPoint.java)

This example Java source code file (DataPoint.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

datapoint, indarray, override, serializable, string

The DataPoint.java Java example source code

/*
 *
 *  * Copyright 2015 Skymind,Inc.
 *  *
 *  *    Licensed 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.deeplearning4j.clustering.sptree;

import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.api.ops.impl.accum.distances.CosineSimilarity;
import org.nd4j.linalg.api.ops.impl.accum.distances.EuclideanDistance;
import org.nd4j.linalg.api.ops.impl.accum.distances.ManhattanDistance;
import org.nd4j.linalg.factory.Nd4j;

import java.io.Serializable;

/**
 *
 * A vector with an index and function for distance
 * @author Adam Gibson
 */
public class DataPoint implements Serializable {
    private int index;
    private INDArray point;
    private int d;
    private String functionName;
    private boolean invert = false;


    public DataPoint(int index, INDArray point,boolean invert) {
        this(index,point,"euclidean");
        this.invert = invert;
    }
    public DataPoint(int index, INDArray point,String functionName,boolean invert) {
        this.index = index;
        this.point = point;
        this.functionName = functionName;
        this.d = point.length();
        this.invert = invert;
    }


    public DataPoint(int index, INDArray point) {
        this(index,point,false);
    }

    public DataPoint(int index, INDArray point,String functionName) {
       this(index,point,functionName,false);
    }

    /**
     * Euclidean distance
     * @param point the distance from this point to the given point
     * @return the distance between the two points
     */
    public double distance(DataPoint point) {
        switch (functionName) {
            case "euclidean" :
                double ret =  Nd4j.getExecutioner().execAndReturn(new EuclideanDistance(this.point,point.point)).currentResult().doubleValue();
                return invert ? -ret : ret;

            case "cosinesimilarity" :
                double ret2 =  Nd4j.getExecutioner().execAndReturn(new CosineSimilarity(this.point,point.point)).currentResult().doubleValue();
                return invert ? -ret2 : ret2;

            case "manhattan" :
                double ret3 =  Nd4j.getExecutioner().execAndReturn(new ManhattanDistance(this.point,point.point)).currentResult().doubleValue();
              return invert ? -ret3 : ret3;
            case "dot" :
                double dotRet =  Nd4j.getBlasWrapper().dot(this.point,point.point);
                return invert ? -dotRet : dotRet;
            default: double ret4 =  Nd4j.getExecutioner().execAndReturn(new EuclideanDistance(this.point,point.point)).currentResult().doubleValue();
                return invert ? -ret4 : ret4;

        }
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        DataPoint dataPoint = (DataPoint) o;

        if (index != dataPoint.index) return false;
        return !(point != null ? !point.equals(dataPoint.point) : dataPoint.point != null);

    }

    @Override
    public int hashCode() {
        int result = index;
        result = 31 * result + (point != null ? point.hashCode() : 0);
        return result;
    }

    public int getD() {
        return d;
    }

    public void setD(int d) {
        this.d = d;
    }

    public int getIndex() {
        return index;
    }

    public void setIndex(int index) {
        this.index = index;
    }

    public INDArray getPoint() {
        return point;
    }

    public void setPoint(INDArray point) {
        this.point = point;
    }
}