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/*
*
* * 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.SparkContext;
import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.broadcast.Broadcast;
import org.apache.spark.mllib.linalg.Matrix;
import org.apache.spark.mllib.linalg.Vector;
import org.apache.spark.mllib.regression.LabeledPoint;
import org.datavec.api.records.reader.RecordReader;
import org.deeplearning4j.nn.api.Layer;
import org.deeplearning4j.nn.conf.NeuralNetConfiguration;
import org.deeplearning4j.nn.conf.layers.FeedForwardLayer;
import org.deeplearning4j.spark.datavec.RecordReaderFunction;
import org.deeplearning4j.spark.impl.common.Add;
import org.deeplearning4j.spark.util.MLLibUtil;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.dataset.DataSet;
import org.nd4j.linalg.factory.Nd4j;
import parquet.org.slf4j.Logger;
import parquet.org.slf4j.LoggerFactory;
import java.io.Serializable;
/**
* Master class for org.deeplearning4j.spark
* layers
* @author Adam Gibson
*/
public class SparkDl4jLayer implements Serializable {
private transient SparkContext sparkContext;
private transient JavaSparkContext sc;
private NeuralNetConfiguration conf;
private Layer layer;
private Broadcast params;
private boolean averageEachIteration = false;
private static Logger log = LoggerFactory.getLogger(SparkDl4jLayer.class);
public SparkDl4jLayer(SparkContext sparkContext, NeuralNetConfiguration conf) {
this.sparkContext = sparkContext;
this.conf = conf.clone();
sc = new JavaSparkContext(this.sparkContext);
}
public SparkDl4jLayer(JavaSparkContext sc, NeuralNetConfiguration conf) {
this.sc = sc;
this.conf = conf.clone();
}
/**
* Fit the layer based on the specified org.deeplearning4j.spark context text file
* @param path the path to the text file
* @param labelIndex the index of the label
* @param recordReader the record reader
* @return the fit layer
*/
public Layer fit(String path,int labelIndex,RecordReader recordReader) {
FeedForwardLayer ffLayer = (FeedForwardLayer) conf.getLayer();
JavaRDD lines = sc.textFile(path);
// gotta map this to a Matrix/INDArray
JavaRDD points = lines.map(new RecordReaderFunction(recordReader
, labelIndex, ffLayer.getNOut()));
return fitDataSet(points);
}
/**
* Fit the given rdd given the context.
* This will convert the labeled points
* to the internal dl4j format and train the model on that
* @param sc the org.deeplearning4j.spark context
* @param rdd the rdd to fitDataSet
* @return the multi layer network that was fitDataSet
*/
public Layer fit(JavaSparkContext sc,JavaRDD rdd) {
FeedForwardLayer ffLayer = (FeedForwardLayer) conf.getLayer();
return fitDataSet(MLLibUtil.fromLabeledPoint(sc, rdd, ffLayer.getNOut()));
}
/**
* Fit a java rdd of dataset
* @param rdd the rdd to fit
* @return the fit layer
*/
public Layer fitDataSet(JavaRDD rdd) {
int iterations = conf.getNumIterations();
long count = rdd.count();
log.info("Running distributed training averaging each iteration " + averageEachIteration + " and " + rdd.partitions().size() + " partitions");
if(!averageEachIteration) {
int numParams = conf.getLayer().initializer().numParams(conf,true);
final INDArray params = Nd4j.create(1, numParams);
Layer layer = conf.getLayer().instantiate(conf,null,0,params, true);
layer.setBackpropGradientsViewArray(Nd4j.create(1,numParams));
// final INDArray params = layer.params();
this.params = sc.broadcast(params);
log.info("Broadcasting initial parameters of length " + params.length());
int paramsLength = layer.numParams();
if(params.length() != paramsLength)
throw new IllegalStateException("Number of params " + paramsLength + " was not equal to " + params.length());
JavaRDD results = rdd.sample(true,0.4).mapPartitions(new IterativeReduceFlatMap(conf.toJson(), this.params));
log.debug("Ran iterative reduce...averaging results now.");
INDArray newParams = results.fold(Nd4j.zeros(results.first().shape()),new Add());
newParams.divi(rdd.partitions().size());
layer.setParams(newParams);
this.layer = layer;
}
else {
conf.setNumIterations(1);
int numParams = conf.getLayer().initializer().numParams(conf,true);
final INDArray params = Nd4j.create(1, numParams);
Layer layer = conf.getLayer().instantiate(conf, null, 0, params, true);
layer.setBackpropGradientsViewArray(Nd4j.create(1,numParams));
// final INDArray params = layer.params();
this.params = sc.broadcast(params);
for(int i = 0; i < iterations; i++) {
JavaRDD results = rdd.sample(true,0.3).mapPartitions(new IterativeReduceFlatMap(conf.toJson(), this.params));
int paramsLength = layer.numParams();
if(params.length() != paramsLength)
throw new IllegalStateException("Number of params " + paramsLength + " was not equal to " + params.length());
INDArray newParams = results.fold(Nd4j.zeros(results.first().shape()), new Add());
newParams.divi(rdd.partitions().size());
}
layer.setParams(this.params.value().dup());
this.layer = layer;
}
return layer;
}
/**
* Predict the given feature matrix
* @param features the given feature matrix
* @return the predictions
*/
public Matrix predict(Matrix features) {
return MLLibUtil.toMatrix(layer.activate(MLLibUtil.toMatrix(features)));
}
/**
* Predict the given vector
* @param point the vector to predict
* @return the predicted vector
*/
public Vector predict(Vector point) {
return MLLibUtil.toVector(layer.activate(MLLibUtil.toVector(point)));
}
/**
* Train a multi layer network
* @param data the data to train on
* @param conf the configuration of the network
* @return the fit multi layer network
*/
public static Layer train(JavaRDD data,NeuralNetConfiguration conf) {
SparkDl4jLayer multiLayer = new SparkDl4jLayer(data.context(),conf);
return multiLayer.fit(new JavaSparkContext(data.context()),data);
}
}
