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Java example source code file (DL4jWorker.java)

This example Java source code file (DL4jWorker.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

dl4jworker, function, illegalstateexception, indarray, layer, layerfactory, model, neuralnetconfiguration, number, outputlayer, override, please

The DL4jWorker.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.spark.impl.layer;

import org.apache.spark.api.java.function.Function;
import org.deeplearning4j.nn.api.Layer;
import org.deeplearning4j.nn.api.LayerFactory;
import org.deeplearning4j.nn.api.Model;
import org.deeplearning4j.nn.conf.NeuralNetConfiguration;
import org.deeplearning4j.nn.layers.OutputLayer;
import org.deeplearning4j.nn.layers.factory.LayerFactories;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.dataset.DataSet;
import org.nd4j.linalg.factory.Nd4j;

/**
 * This is considered the "Worker"
 * This is the code that will run the .fitDataSet() method on the network
 *
 * the issue here is that this is getting called 1x per record
 * and before we could call it in a more controlled mini-batch setting
 *
 * @author josh
 * @author Adam Gibson
 */
public class DL4jWorker implements Function<DataSet, INDArray> {

    private final Model network;

    public DL4jWorker(String json,INDArray params) {
        NeuralNetConfiguration conf = NeuralNetConfiguration.fromJson(json);
        LayerFactory layerFactory = LayerFactories.getFactory(conf.getLayer());
        if(layerFactory == null)
            throw new IllegalStateException("Please specify a layer factory");
        int numParams = layerFactory.initializer().numParams(conf,true);
        INDArray thisParams = Nd4j.create(1, numParams);
        this.network = layerFactory.create(conf, null, 0, thisParams, true);
        if(numParams != params.length())
            throw new IllegalStateException("Number of params for configured network was " + numParams + " while the specified parameter vector length was " + params.length());
        Layer network = (Layer) this.network;
        network.setParams(params);
    }

    @Override
    public INDArray call(DataSet v1) throws Exception {
        try {
            Layer network = (Layer) this.network;
            if(network instanceof OutputLayer) {
                OutputLayer o = (OutputLayer) network;
                o.fit(v1);
            }
            else
                network.fit(v1.getFeatureMatrix());
            return network.params();
        }catch(Exception e) {
            System.err.println("Error with dataset " + v1.numExamples());
            throw e;
        }

    }
}

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