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Java example source code file (ReshapePreProcessor.java)

This example Java source code file (ReshapePreProcessor.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.

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Java - Java tags/keywords

activations, baseinputpreprocessor, data, epsilons, equalsandhashcode, illegal, illegalstateexception, indarray, jsoncreator, jsonproperty, override, reshapepreprocessor

The ReshapePreProcessor.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.nn.conf.preprocessor;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;

import lombok.Data;

import lombok.EqualsAndHashCode;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.util.ArrayUtil;

/**Reshape post processor.<br>
 * Used to reshape activations on forward pass.<br>
 * Also (optionally, if fromShape != null) used to reshape, weights*deltas
 * during backward pass. Otherwise, no changes are made during backward pass
 *
 * @author Adam Gibson
 */
@Data @EqualsAndHashCode(callSuper=false)
public class ReshapePreProcessor extends BaseInputPreProcessor {
    private int[] fromShape;	//Epsilons: To this shape in backward pass
    private int[] toShape;		//Activations: To this shape in forward pass
    private boolean dynamic=true;

    /**
     * @param fromShape May be null. If null: no change/op during backward pass.
     * @param toShape The shape that activations are reshaped to
     * @param dynamic Infer the number of examples or not
     * Otherwise fromShape is the shape that epsilons (weights*deltas or equiv.)
     *  are reshaped to by backprop(...)
     */
    @JsonCreator
    public ReshapePreProcessor(@JsonProperty("fromShape") int[] fromShape,
                               @JsonProperty("toShape") int[] toShape,
                               @JsonProperty("dynamic") boolean dynamic){
        this.fromShape = fromShape;
        this.toShape = toShape;
        this.dynamic = dynamic;
    }

    public ReshapePreProcessor(int... toShape) {
        this(null, toShape, true);
    }
    public ReshapePreProcessor(int[] fromShape, int[] toShape) {
        this(fromShape, toShape, true);
    }

    @Override
    public INDArray preProcess(INDArray input, int miniBatchSize) {
        if (dynamic) fromShape[0] = input.shape()[0];
        if (input.shape().length == toShape.length) return input;
        return input.reshape(toShape);
    }

    @Override
    public INDArray backprop(INDArray output, int miniBatchSize) {
        if( fromShape == null || output.shape().length == fromShape.length)
            return output;	//no-op
        if(output.length() != ArrayUtil.prod(fromShape))
            throw new IllegalStateException("Illegal shape");
        return output.reshape(fromShape);
    }

    @Override
    public ReshapePreProcessor clone() {
        ReshapePreProcessor clone = (ReshapePreProcessor) super.clone();
        if(clone.fromShape != null) clone.fromShape = clone.fromShape.clone();
        if(clone.toShape != null) clone.toShape = clone.toShape.clone();
        return clone;
    }
}

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