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Optional components of Mahout which generally support interaction with third party systems,
formats, APIs, etc.
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/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.mahout.clustering.lda;
import com.google.common.io.Closeables;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.PriorityQueue;
import java.util.Queue;
import org.apache.commons.cli2.CommandLine;
import org.apache.commons.cli2.Group;
import org.apache.commons.cli2.Option;
import org.apache.commons.cli2.OptionException;
import org.apache.commons.cli2.builder.ArgumentBuilder;
import org.apache.commons.cli2.builder.DefaultOptionBuilder;
import org.apache.commons.cli2.builder.GroupBuilder;
import org.apache.commons.cli2.commandline.Parser;
import org.apache.commons.io.Charsets;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.DoubleWritable;
import org.apache.mahout.common.CommandLineUtil;
import org.apache.mahout.common.IntPairWritable;
import org.apache.mahout.common.Pair;
import org.apache.mahout.common.commandline.DefaultOptionCreator;
import org.apache.mahout.common.iterator.sequencefile.PathType;
import org.apache.mahout.common.iterator.sequencefile.SequenceFileDirIterable;
import org.apache.mahout.utils.vectors.VectorHelper;
/**
* Class to print out the top K words for each topic.
*/
public final class LDAPrintTopics {
private LDAPrintTopics() { }
// Expands the queue list to have a Queue for topic K
private static void ensureQueueSize(Collection>> queues, int k) {
for (int i = queues.size(); i <= k; ++i) {
queues.add(new PriorityQueue>());
}
}
public static void main(String[] args) throws Exception {
DefaultOptionBuilder obuilder = new DefaultOptionBuilder();
ArgumentBuilder abuilder = new ArgumentBuilder();
GroupBuilder gbuilder = new GroupBuilder();
Option inputOpt = DefaultOptionCreator.inputOption().create();
Option dictOpt = obuilder.withLongName("dict").withRequired(true).withArgument(
abuilder.withName("dict").withMinimum(1).withMaximum(1).create()).withDescription(
"Dictionary to read in, in the same format as one created by "
+ "org.apache.mahout.utils.vectors.lucene.Driver").withShortName("d").create();
Option outOpt = DefaultOptionCreator.outputOption().create();
Option wordOpt = obuilder.withLongName("words").withRequired(false).withArgument(
abuilder.withName("words").withMinimum(0).withMaximum(1).withDefault("20").create()).withDescription(
"Number of words to print").withShortName("w").create();
Option dictTypeOpt = obuilder.withLongName("dictionaryType").withRequired(false).withArgument(
abuilder.withName("dictionaryType").withMinimum(1).withMaximum(1).create()).withDescription(
"The dictionary file type (text|sequencefile)").withShortName("dt").create();
Option helpOpt = obuilder.withLongName("help").withDescription("Print out help").withShortName("h")
.create();
Group group = gbuilder.withName("Options").withOption(dictOpt).withOption(outOpt).withOption(wordOpt)
.withOption(inputOpt).withOption(dictTypeOpt).create();
try {
Parser parser = new Parser();
parser.setGroup(group);
CommandLine cmdLine = parser.parse(args);
if (cmdLine.hasOption(helpOpt)) {
CommandLineUtil.printHelp(group);
return;
}
String input = cmdLine.getValue(inputOpt).toString();
String dictFile = cmdLine.getValue(dictOpt).toString();
int numWords = 20;
if (cmdLine.hasOption(wordOpt)) {
numWords = Integer.parseInt(cmdLine.getValue(wordOpt).toString());
}
Configuration config = new Configuration();
String dictionaryType = "text";
if (cmdLine.hasOption(dictTypeOpt)) {
dictionaryType = cmdLine.getValue(dictTypeOpt).toString();
}
List wordList;
if ("text".equals(dictionaryType)) {
wordList = Arrays.asList(VectorHelper.loadTermDictionary(new File(dictFile)));
} else if ("sequencefile".equals(dictionaryType)) {
wordList = Arrays.asList(VectorHelper.loadTermDictionary(config, dictFile));
} else {
throw new IllegalArgumentException("Invalid dictionary format");
}
List>> topWords = topWordsForTopics(input, config, wordList, numWords);
File output = null;
if (cmdLine.hasOption(outOpt)) {
output = new File(cmdLine.getValue(outOpt).toString());
if (!output.exists() && !output.mkdirs()) {
throw new IOException("Could not create directory: " + output);
}
}
printTopWords(topWords, output);
} catch (OptionException e) {
CommandLineUtil.printHelp(group);
throw e;
}
}
// Adds the word if the queue is below capacity, or the score is high enough
private static void maybeEnqueue(Queue> q, String word, double score, int numWordsToPrint) {
if (q.size() >= numWordsToPrint && score > q.peek().getSecond()) {
q.poll();
}
if (q.size() < numWordsToPrint) {
q.add(new Pair<>(word, score));
}
}
private static void printTopWords(List>> topWords, File outputDir)
throws IOException {
for (int i = 0; i < topWords.size(); ++i) {
Collection> topK = topWords.get(i);
Writer out = null;
boolean printingToSystemOut = false;
try {
if (outputDir != null) {
out = new OutputStreamWriter(new FileOutputStream(new File(outputDir, "topic_" + i)), Charsets.UTF_8);
} else {
out = new OutputStreamWriter(System.out, Charsets.UTF_8);
printingToSystemOut = true;
out.write("Topic " + i);
out.write('\n');
out.write("===========");
out.write('\n');
}
List> topKasList = new ArrayList<>(topK.size());
for (Pair wordWithScore : topK) {
topKasList.add(wordWithScore);
}
Collections.sort(topKasList, new Comparator>() {
@Override
public int compare(Pair pair1, Pair pair2) {
return pair2.getSecond().compareTo(pair1.getSecond());
}
});
for (Pair wordWithScore : topKasList) {
out.write(wordWithScore.getFirst() + " [p(" + wordWithScore.getFirst() + "|topic_" + i + ") = "
+ wordWithScore.getSecond());
out.write('\n');
}
} finally {
if (!printingToSystemOut) {
Closeables.close(out, false);
} else {
out.flush();
}
}
}
}
private static List>> topWordsForTopics(String dir,
Configuration job,
List wordList,
int numWordsToPrint) {
List>> queues = new ArrayList<>();
Map expSums = new HashMap<>();
for (Pair record
: new SequenceFileDirIterable(
new Path(dir, "part-*"), PathType.GLOB, null, null, true, job)) {
IntPairWritable key = record.getFirst();
int topic = key.getFirst();
int word = key.getSecond();
ensureQueueSize(queues, topic);
if (word >= 0 && topic >= 0) {
double score = record.getSecond().get();
if (expSums.get(topic) == null) {
expSums.put(topic, 0.0);
}
expSums.put(topic, expSums.get(topic) + Math.exp(score));
String realWord = wordList.get(word);
maybeEnqueue(queues.get(topic), realWord, score, numWordsToPrint);
}
}
for (int i = 0; i < queues.size(); i++) {
Queue> queue = queues.get(i);
Queue> newQueue = new PriorityQueue<>(queue.size());
double norm = expSums.get(i);
for (Pair pair : queue) {
newQueue.add(new Pair<>(pair.getFirst(), Math.exp(pair.getSecond()) / norm));
}
queues.set(i, newQueue);
}
return queues;
}
}