/*
* Sifarish: Recommendation Engine
* Author: Pranab Ghosh
*
* 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.sifarish.feature;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.chombo.util.BasicUtils;
import org.chombo.util.Pair;
import org.chombo.util.SecondarySort;
import org.chombo.util.Tuple;
import org.sifarish.util.Field;
import org.sifarish.util.MatchingProfile;
import org.sifarish.util.Utility;
/**
* @author pranab
*
*/
public class ProfileItemSimilarity extends Configured implements Tool {
@Override
public int run(String[] args) throws Exception {
Job job = new Job(getConf());
String jobName = "profile and entity similarity MR";
job.setJobName(jobName);
job.setJarByClass(ProfileItemSimilarity.class);
FileInputFormat.addInputPaths(job, args[0]);
FileOutputFormat.setOutputPath(job, new Path(args[1]));
job.setMapperClass(ProfileItemSimilarity.SimilarityMapper.class);
job.setReducerClass(ProfileItemSimilarity.SimilarityReducer.class);
job.setMapOutputKeyClass(Tuple.class);
job.setMapOutputValueClass(Tuple.class);
job.setOutputKeyClass(NullWritable.class);
job.setOutputValueClass(Text.class);
job.setGroupingComparatorClass(SecondarySort.TuplePairGroupComprator.class);
job.setPartitionerClass(SecondarySort.TuplePairPartitioner.class);
Utility.setConfiguration(job.getConfiguration());
int numReducer = job.getConfiguration().getInt("pes.num.reducer", -1);
numReducer = -1 == numReducer ? job.getConfiguration().getInt("num.reducer", 1) : numReducer;
job.setNumReduceTasks(numReducer);
int status = job.waitForCompletion(true) ? 0 : 1;
return status;
}
/**
* @author pranab
*
*/
public static class SimilarityMapper extends Mapper<LongWritable, Text, Tuple, Tuple> {
private Tuple outKey = new Tuple();
private Tuple outVal = new Tuple();
private String fieldDelimRegex;
private String subFieldDelimRegex;
private SingleTypeSchema schema;
private List<MatchingProfile> profiles = new ArrayList<MatchingProfile>();
private String[] items;
private double dist;
private int idOrdinal;
private String fieldVal;
private String dataType;
private Pair<Integer, Integer> intRange;
private Pair<Double, Double> dblRange;
private Set<String> valueSet;
private int scale;
private DistanceStrategy distStrategy;
private DynamicAttrSimilarityStrategy textSimStrategy;
private String itemId;
private String profileId;
private int fieldOrd;
/* (non-Javadoc)
* @see org.apache.hadoop.mapreduce.Mapper#setup(org.apache.hadoop.mapreduce.Mapper.Context)
*/
protected void setup(Context context) throws IOException, InterruptedException {
Configuration config = context.getConfiguration();
fieldDelimRegex = config.get("field.delim.regex", ",");
subFieldDelimRegex = config.get("sub.field.delim.regex", ":");
schema = Utility.getSingleTypeSchema(config, "pes.schema.file.path");
//load profiles
List<String> lines = org.chombo.util.Utility.getFileLines(config, "pes.profile.file.path");
for (String line : lines) {
profiles.add(new MatchingProfile(line, fieldDelimRegex, subFieldDelimRegex, schema));
}
//ordinal of Id field
idOrdinal = schema.getEntity().getIdField().getOrdinal();
//distance calculation strategy
scale = config.getInt("pes.distance.scale", 1000);
distStrategy = schema.createDistanceStrategy(scale);
//text field similarity calculation strategy
textSimStrategy = schema.createTextSimilarityStrategy();
}
/* (non-Javadoc)
* @see org.apache.hadoop.mapreduce.Mapper#map(KEYIN, VALUEIN, org.apache.hadoop.mapreduce.Mapper.Context)
*/
@Override
protected void map(LongWritable key, Text value, Context context)
throws IOException, InterruptedException {
items = value.toString().split(fieldDelimRegex);
itemId = items[idOrdinal];
//all profiles
for (MatchingProfile profile : profiles) {
profileId = profile.getId(idOrdinal);
//all fields
distStrategy.initialize();
for (Field field : schema.getEntity().getFields()) {
//if ID or class attribute field, skip it
if (field.isId() || field.isClassAttribute()) {
continue;
}
fieldOrd = field.getOrdinal();
fieldVal = items[fieldOrd];
dataType = field.getDataType();
if (dataType.equals(Field.DATA_TYPE_INT)) {
intRange = profile.getIntRange(fieldOrd);
int intVal = Integer.parseInt(fieldVal);
if (intVal >= intRange.getLeft() && intVal <= intRange.getRight()) {
dist = 0;
} else if (intVal < intRange.getLeft()){
dist = field.findDistance(intVal, intRange.getLeft(), schema.getNumericDiffThreshold());
} else {
dist = field.findDistance(intVal, intRange.getRight(), schema.getNumericDiffThreshold());
}
} else if (dataType.equals(Field.DATA_TYPE_DOUBLE)) {
dblRange = profile.getDoubleRange(fieldOrd);
double dblVal = Double.parseDouble(fieldVal);
if (dblVal >= dblRange.getLeft() && dblVal <= dblRange.getRight()) {
dist = 0;
} else if (dblVal < dblRange.getLeft()){
dist = field.findDistance(dblVal, dblRange.getLeft(), schema.getNumericDiffThreshold());
} else {
dist = field.findDistance(dblVal, dblRange.getRight(), schema.getNumericDiffThreshold());
}
} else if (dataType.equals(Field.DATA_TYPE_CATEGORICAL)) {
valueSet = profile.getCategoricalSet(fieldOrd);
if (valueSet.contains(fieldVal)) {
dist = 0;
} else {
//minimum distance to any in the set
double minDist = 2;
double thisDist = 0;
for (String thisValue : valueSet) {
thisDist = field.findDistance(thisValue, fieldVal);
if (thisDist < minDist) {
minDist = thisDist;
}
}
dist = minDist;
}
} else if (dataType.equals(Field.DATA_TYPE_TEXT)) {
dist = textSimStrategy.findDistance(profile.getText(fieldOrd), fieldVal);
} else {
throw new IllegalStateException("unsupported data type");
}
//aggregate attribute distance for all entity attributes
distStrategy.accumulate(dist, field);
}
int netDist = distStrategy.getSimilarity();
outKey.initialize();
outKey.add(profileId, netDist);
outVal.initialize();
outVal.add(itemId, netDist);
context.write(outKey, outVal);
}
}
}
/**
* @author pranab
*
*/
public static class SimilarityReducer extends Reducer<Tuple, Tuple, NullWritable, Text> {
private Text outVal = new Text();
private String fieldDelimOut;
private StringBuilder stBld = new StringBuilder();
private boolean outputFormatCompact;
private List<String> items = new ArrayList<String>();
private boolean outputIncludesDist;
/* (non-Javadoc)
* @see org.apache.hadoop.mapreduce.Reducer#setup(org.apache.hadoop.mapreduce.Reducer.Context)
*/
protected void setup(Context context) throws IOException, InterruptedException {
Configuration config = context.getConfiguration();
fieldDelimOut = config.get("field.delim", ",");
outputFormatCompact = config.getBoolean("pes.output.format.compact", true);
outputIncludesDist = config.getBoolean("pes.output.includes.dist", false);
}
/* (non-Javadoc)
* @see org.apache.hadoop.mapreduce.Reducer#reduce(KEYIN, java.lang.Iterable, org.apache.hadoop.mapreduce.Reducer.Context)
*/
protected void reduce(Tuple key, Iterable<Tuple> values, Context context)
throws IOException, InterruptedException {
items.clear();
for (Tuple value : values){
if (outputFormatCompact) {
items.add(value.getString(0));
} else {
stBld.delete(0, stBld.length());
stBld.append(key.getString(0)).append(fieldDelimOut).append(value.getString(0));
if (outputIncludesDist) {
stBld.append(fieldDelimOut).append(value.getInt(1));
}
outVal.set(stBld.toString());
context.write(NullWritable.get(), outVal);
}
}
if (outputFormatCompact) {
outVal.set(key.getString(0) + BasicUtils.join(items));
context.write(NullWritable.get(), outVal);
}
}
}
/**
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
int exitCode = ToolRunner.run(new ProfileItemSimilarity(), args);
System.exit(exitCode);
}
}