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Java example source code file (ConvolutionUtils.java)

This example Java source code file (ConvolutionUtils.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

convolutionutils, illegalargumentexception

The ConvolutionUtils.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.util;


import org.deeplearning4j.nn.conf.NeuralNetConfiguration;

/**
 * Convolutional shape utilities
 *
 * @author Adam Gibson
 */
public class ConvolutionUtils {


    /**
     * Get the height and width
     * from the configuration
     * @param conf the configuration to get height and width from
     * @return the configuration to get height and width from
     */
    public static int[] getHeightAndWidth(NeuralNetConfiguration conf) {
        return getHeightAndWidth(((org.deeplearning4j.nn.conf.layers.ConvolutionLayer) conf.getLayer()).getKernelSize());
    }


    /**
     * @param conf the configuration to get
     *             the number of kernels from
     * @return the number of kernels/filters to apply
     */
    public static int numFeatureMap(NeuralNetConfiguration conf) {
        return ((org.deeplearning4j.nn.conf.layers.ConvolutionLayer) conf.getLayer()).getNOut();
    }

    /**
     * Get the height and width
     * for an image
     * @param shape the shape of the image
     * @return the height and width for the image
     */
    public static int[] getHeightAndWidth(int[] shape) {
        if(shape.length < 2)
            throw new IllegalArgumentException("No width and height able to be found: array must be at least length 2");
        return new int[] {shape[shape.length - 1],shape[shape.length - 2]};
    }

    /**
     * Returns the number of
     * feature maps for a given shape (must be at least 3 dimensions
     * @param shape the shape to get the
     *              number of feature maps for
     * @return the number of feature maps
     * for a particular shape
     */
    public static int numChannels(int[] shape) {
        if(shape.length < 4)
            return 1;
        return shape[1];
    }



}

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