package ivory.lsh.projection;
import ivory.core.RetrievalEnvironment;
import ivory.core.data.document.WeightedIntDocVector;
import ivory.lsh.data.FloatAsBytesWritable;
import ivory.lsh.data.NBitSignature;
import ivory.lsh.driver.PwsimEnvironment;
import java.io.IOException;
import java.net.URI;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.filecache.DistributedCache;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.mapred.FileInputFormat;
import org.apache.hadoop.mapred.FileOutputFormat;
import org.apache.hadoop.mapred.JobClient;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.MapReduceBase;
import org.apache.hadoop.mapred.Mapper;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.mapred.SequenceFileInputFormat;
import org.apache.hadoop.mapred.SequenceFileOutputFormat;
import org.apache.hadoop.mapred.lib.IdentityReducer;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import tl.lin.data.array.ArrayListOfFloatsWritable;
import tl.lin.data.map.HMapIFW;
import tl.lin.data.map.MapIF;
import edu.umd.cloud9.io.SequenceFileUtils;
import edu.umd.cloud9.util.PowerTool;
/**
* A Hadoop task to compute signatures from document vectors.
*
* usage: [index-path] [num-of-bits] [type-of-computation] ([batch-size])
*
* @author ferhanture
*
*
*/
public class ComputeSignaturesRandom extends PowerTool {
public ComputeSignaturesRandom(Configuration conf) {
super(conf);
}
public static final String[] RequiredParameters = {};
private static final Logger sLogger = Logger.getLogger(ComputeSignaturesRandom.class);
static {
sLogger.setLevel(Level.INFO);
}
protected static enum Maps {
ALL, ONES, ZEROS, EMPTY
};
/**
* Convert int doc vectors into NBitSignature objects using LSH.
*
* @author ferhanture
*
*/
public static class MyMapper extends MapReduceBase implements
Mapper<IntWritable, WeightedIntDocVector, IntWritable, NBitSignature> {
static Path[] localFiles;
static List<Writable> randomUnitVectors;
static int D;
static NBitSignature signature;
static float[] dotProductThresholds;
private String getFilename(String s) {
return s.substring(s.lastIndexOf("/") + 1);
}
@SuppressWarnings("deprecation")
public void configure(JobConf job) {
// sLogger.setLevel(Level.DEBUG);
D = job.getInt("Ivory.NumOfBits", -1);
if (D == -1) {
throw new RuntimeException("Could not read parameters!");
}
String inCacheFile = job.get("InCache");
try {
inCacheFile = getFilename(inCacheFile);
localFiles = DistributedCache.getLocalCacheFiles(job);
for (Path localFile : localFiles) {
sLogger.info("in cache " + localFile);
if (localFile.toString().contains(inCacheFile)) {
randomUnitVectors = SequenceFileUtils.readValues(localFile, FileSystem.getLocal(job));
}
}
if (randomUnitVectors == null) throw new RuntimeException("File not found in local cache: " + inCacheFile);
} catch (Exception e) {
throw new RuntimeException("Error reading random vectors!\n" + e.getMessage());
}
signature = new NBitSignature(D);
}
static public double dotProduct(HMapIFW docvector, FloatAsBytesWritable vector) {
float s = 0;
for (MapIF.Entry f : docvector.entrySet()) {
int indexOfTerm = f.getKey();
s += f.getValue() * vector.getAsFloat(indexOfTerm - 1);
}
return s;
}
static public double dotProduct(HMapIFW docvector, ArrayListOfFloatsWritable vector) {
float s = 0;
for (MapIF.Entry f : docvector.entrySet()) {
int indexOfTerm = f.getKey();
s += f.getValue() * vector.get(indexOfTerm - 1);
}
return s;
}
public void map(IntWritable docno, WeightedIntDocVector docvectorIn,
OutputCollector<IntWritable, NBitSignature> output, Reporter reporter) throws IOException {
HMapIFW docvector = docvectorIn.getWeightedTerms();
FloatAsBytesWritable value;
for (int i = 0; i < randomUnitVectors.size(); i++) {
value = (FloatAsBytesWritable) randomUnitVectors.get(i);
double dprod = dotProduct(docvector, value);
boolean sign = (dprod >= (dotProductThresholds == null ? 0 : dotProductThresholds[i])) ? true
: false;
signature.set(i, sign);
}
sLogger.debug("Doc vector " + docvector + " mapped to \nBitsSignature: " + docno + "\n"
+ signature);
output.collect(docno, signature);
}
}
@SuppressWarnings("deprecation")
public int runTool() throws Exception {
int D = getConf().getInt("Ivory.NumOfBits", -1);
int numBatchFiles = getConf().getInt("NumBatch", 0);
boolean isBatch = (numBatchFiles != 0);
String dir = getConf().get("Ivory.IndexPath");
if (D < 0 || numBatchFiles < 0) {
throw new RuntimeException("Parameters not read properly! Quitting...");
}
JobConf job = new JobConf(getConf(), ComputeSignaturesRandom.class);
FileSystem fs = FileSystem.get(job);
RetrievalEnvironment re = new RetrievalEnvironment(dir, fs);
job.setJobName("ComputeSignatures_random_D=" + D + ":" + re.readCollectionName());
String inputPath = PwsimEnvironment.getIntDocvectorsFile(dir, fs);
String outputPath = PwsimEnvironment.getSignaturesDir(dir, D, "random");
String randomVectorFile = PwsimEnvironment.getRandomVectorsDir(dir, D) + "/part-00000";
job.set("InCache", randomVectorFile);
DistributedCache.addCacheFile(new URI(randomVectorFile), job);
int numMappers = 300;
if (fs.exists(new Path(outputPath))) {
sLogger.info("Signatures output path already exists! Quitting...");
return 0;
}
sLogger.info("Computing signatures...");
sLogger.info("Type of computation: Random");
sLogger.info("Total number of bits: " + D);
sLogger.info("randomVectorFile: " + randomVectorFile);
sLogger.info("InputPath: " + inputPath);
sLogger.info("outputPath: " + outputPath);
sLogger.info("Batch?: " + isBatch);
FileInputFormat.setInputPaths(job, new Path(inputPath));
FileOutputFormat.setOutputPath(job, new Path(outputPath));
FileOutputFormat.setCompressOutput(job, false);
job.set("mapred.child.java.opts", "-Xmx2048m");
job.setInt("mapred.map.max.attempts", 10);
job.setInt("mapred.reduce.max.attempts", 10);
job.setInt("mapred.task.timeout", 6000000);
job.setNumMapTasks(numMappers);
job.setInputFormat(SequenceFileInputFormat.class);
job.setMapOutputKeyClass(IntWritable.class);
job.setMapOutputValueClass(NBitSignature.class);
job.setOutputKeyClass(IntWritable.class);
job.setOutputValueClass(NBitSignature.class);
job.setMapperClass(MyMapper.class);
job.setOutputFormat(SequenceFileOutputFormat.class);
if (isBatch) {
job.setNumReduceTasks(numBatchFiles);
job.setReducerClass(IdentityReducer.class);
} else {
job.setNumReduceTasks(0);
}
long startTime = System.currentTimeMillis();
JobClient.runJob(job);
System.out.println("Job finished in " + (System.currentTimeMillis() - startTime) / 1000.0 + " seconds");
return 0;
}
@Override
public String[] getRequiredParameters() {
return new String[] {};
}
}