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Java example source code file (PlotFilters.java)

This example Java source code file (PlotFilters.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

illegalstateexception, indarray, indarrayindex, please, plotfilters

The PlotFilters.java Java example source code

package org.deeplearning4j.plot;

import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.factory.Nd4j;
import org.nd4j.linalg.indexing.INDArrayIndex;
import org.nd4j.linalg.indexing.NDArrayIndex;

/**
 * Based on the work by krizshevy et. al
 *
 * Plot filters takes in either 2d or 4d input
 *
 * 2d input represents one matrix.
 *
 * Typically for RBMs and AutoEncoders
 * this will be a transposed nout x nin
 * matrix.
 *
 * For 4d input (multiple channels and images)
 *
 * the input should of shape:Au
 * channels x number images x rows x columns
 *
 * @author Adam Gibson
 */
public class PlotFilters {
    private INDArray plot;
    private INDArray input;
    private int[] tileShape;
    private int[] tileSpacing = {0,0};
    private int[] imageShape;
    private boolean scaleRowsToInterval = true;
    private boolean outputPixels = true;

    /**
     *
     * @param input a 2d or 4d matrix (see the input above)
     * @param tileShape the tile shape (typically 10,10)
     * @param tileSpacing the tile spacing(typically 0,0 or 1,1)
     * @param imageShape the intended image shape
     */
    public PlotFilters(INDArray input, int[] tileShape, int[] tileSpacing, int[] imageShape) {
        this.input = input;
        this.tileShape = tileShape;
        this.tileSpacing = tileSpacing;
        this.imageShape = imageShape;
    }


    public INDArray getInput() {
        return input;
    }

    public void setInput(INDArray input) {
        this.input = input;
    }

    /**
     * scale the data to between 0 and 1
     * @param toScale the data to scale
     * @return the scaled version of the data passed in
     */
    public INDArray scale(INDArray toScale) {
        return toScale.sub(toScale.min(Integer.MAX_VALUE)).muli(1.0 / (Nd4j.EPS_THRESHOLD + toScale.max(Integer.MAX_VALUE).getDouble(0)));
    }


    /**
     * Plot the image
     */
    public void plot() {
        int[] retShape = {(imageShape[0] + tileSpacing[0]) * tileShape[0] - tileSpacing[0],(imageShape[1] + tileSpacing[1]) * tileShape[1] - tileSpacing[1]};
        if(input.rank() == 2) {
            plot = plotSection(input,retShape);
        }
        else {
            plot = Nd4j.zeros(retShape[0],retShape[1],4);

            for(int i = 0; i < 4; i++) {
                INDArray retSection = plotSection(input.slice(i), retShape);
                plot.putSlice(i,retSection);
            }
        }


    }

    /**
     * Returns the plot ndarray
     * to be rendered
     * @return the plot ndarray to be rendered
     */
    public INDArray getPlot() {
        if(plot == null) {
            throw new IllegalStateException("Please call plot() first.");
        }
        return plot;
    }



    private INDArray plotSection(INDArray input,int[] retShape) {
        INDArray ret = Nd4j.zeros(retShape);
        if(input.getLeadingOnes() == 2)
            input = input.reshape(input.size(-2),input.size(-1));
        int h = imageShape[0];
        int w = imageShape[1];
        int hs = tileSpacing[0];
        int ws = tileSpacing[1];
        for(int tileRow = 0; tileRow < tileShape[0]; tileRow++) {
            for(int tileCol = 0; tileCol < tileShape[1]; tileCol++) {
                if(tileRow * tileShape[1] + tileCol < input.size(0)) {
                    INDArray image = input.get(NDArrayIndex.point(tileRow * tileShape[1] + tileCol));
                    image = image.reshape(imageShape);

                    if(scaleRowsToInterval) {
                        image = scale(image);
                    }

                    if(outputPixels)
                        image.muli(255);
                    int rowBegin = tileRow * (h + hs);
                    int rowEnd = tileRow * (h + hs) + h;
                    int colBegin = tileCol * (w + ws);
                    int colEnd = tileCol * (w + ws) + w;
                    INDArrayIndex rowIndex = NDArrayIndex.interval(rowBegin,rowEnd);
                    INDArrayIndex colIndex = NDArrayIndex.interval(colBegin,colEnd);
                    ret.put(new INDArrayIndex[]{rowIndex,colIndex},image);


                }
            }
        }

        return ret;
    }




}

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