001/**
002 * Copyright (c) 2011, The University of Southampton and the individual contributors.
003 * All rights reserved.
004 *
005 * Redistribution and use in source and binary forms, with or without modification,
006 * are permitted provided that the following conditions are met:
007 *
008 *   *  Redistributions of source code must retain the above copyright notice,
009 *      this list of conditions and the following disclaimer.
010 *
011 *   *  Redistributions in binary form must reproduce the above copyright notice,
012 *      this list of conditions and the following disclaimer in the documentation
013 *      and/or other materials provided with the distribution.
014 *
015 *   *  Neither the name of the University of Southampton nor the names of its
016 *      contributors may be used to endorse or promote products derived from this
017 *      software without specific prior written permission.
018 *
019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
020 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
021 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
022 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
023 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
024 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
026 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029 */
030package org.openimaj.hadoop.tools.fastkmeans;
031
032import java.io.IOException;
033
034import org.apache.hadoop.conf.Configured;
035import org.apache.hadoop.fs.Path;
036import org.apache.hadoop.io.BytesWritable;
037import org.apache.hadoop.io.IntWritable;
038import org.apache.hadoop.mapred.JobConf;
039import org.apache.hadoop.mapreduce.Job;
040import org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat;
041import org.apache.hadoop.mapreduce.lib.output.SequenceFileOutputFormat;
042import org.apache.hadoop.util.Tool;
043import org.apache.hadoop.util.ToolRunner;
044import org.openimaj.hadoop.sequencefile.SequenceFileUtility;
045
046
047public class SequenceFileByteFeatureSelector extends Configured implements Tool  {
048
049        /**
050         * 
051         */
052        private static final long serialVersionUID = -5976796322589912944L;
053        private String inputFilePath;
054        private String outputFilePath;
055        private int nRandomRows;
056        private HadoopFastKMeansOptions options;
057        
058        public SequenceFileByteFeatureSelector(String inputFilePath, String outputFilePath, HadoopFastKMeansOptions options) throws IOException, InterruptedException, ClassNotFoundException{
059                this.inputFilePath = inputFilePath;
060                this.outputFilePath = outputFilePath;
061                this.options = options;
062        }
063
064        public String getRandomFeatures(int k) throws Exception {
065                this.nRandomRows = k;
066                ToolRunner.run(this, options.original_args);
067        return this.outputFilePath;
068        }
069
070        @Override
071        public int run(String[] args) throws Exception {
072                // Create the output path
073                Path outpath = new Path(SequenceFileUtility.convertToURI(this.outputFilePath).toString());
074            System.out.println("It is all going to: " + outpath);
075                
076                Path[] sequenceFiles = SequenceFileUtility.getFilePaths(inputFilePath, "part");
077        
078        Job job = new Job(this.getConf(), "featureselect");
079        job.setNumReduceTasks(1);
080        job.setJarByClass(SequenceFileByteImageFeatureSelector.class); 
081        job.setOutputKeyClass(IntWritable.class);
082        job.setOutputValueClass(BytesWritable.class);
083        
084        job.setMapperClass(FeatureSelect.Map.class);
085        job.setReducerClass(FeatureSelect.Reduce.class);
086        
087        job.setInputFormatClass(SequenceFileInputFormat.class);
088        job.setOutputFormatClass(SequenceFileOutputFormat.class);
089        
090        job.getConfiguration().setStrings(FeatureSelect.FILETYPE_KEY, new String[]{options.fileType});
091                job.getConfiguration().setStrings(FeatureSelect.NFEATURE_KEY, new String[]{"" + this.nRandomRows});
092                
093                ((JobConf)job.getConfiguration()).setNumTasksToExecutePerJvm(-1);
094                
095                SequenceFileInputFormat.setInputPaths(job, sequenceFiles);
096            SequenceFileOutputFormat.setOutputPath(job, outpath);
097                SequenceFileOutputFormat.setCompressOutput(job, false);
098        job.waitForCompletion(true);
099                return 0;
100        }
101
102}