/**
* 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.classifier.sequencelearning.hmm;
import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import com.google.common.base.Charsets;
import com.google.common.io.Closeables;
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.mahout.common.CommandLineUtil;
/**
* Command-line tool for generating random sequences by given HMM
*/
public final class RandomSequenceGenerator {
private RandomSequenceGenerator() {
}
public static void main(String[] args) throws IOException {
DefaultOptionBuilder optionBuilder = new DefaultOptionBuilder();
ArgumentBuilder argumentBuilder = new ArgumentBuilder();
Option outputOption = optionBuilder.withLongName("output").
withDescription("Output file with sequence of observed states").
withShortName("o").withArgument(argumentBuilder.withMaximum(1).withMinimum(1).
withName("path").create()).withRequired(false).create();
Option modelOption = optionBuilder.withLongName("model").
withDescription("Path to serialized HMM model").
withShortName("m").withArgument(argumentBuilder.withMaximum(1).withMinimum(1).
withName("path").create()).withRequired(true).create();
Option lengthOption = optionBuilder.withLongName("length").
withDescription("Length of generated sequence").
withShortName("l").withArgument(argumentBuilder.withMaximum(1).withMinimum(1).
withName("number").create()).withRequired(true).create();
Group optionGroup = new GroupBuilder().
withOption(outputOption).withOption(modelOption).withOption(lengthOption).
withName("Options").create();
try {
Parser parser = new Parser();
parser.setGroup(optionGroup);
CommandLine commandLine = parser.parse(args);
String output = (String) commandLine.getValue(outputOption);
String modelPath = (String) commandLine.getValue(modelOption);
int length = Integer.parseInt((String) commandLine.getValue(lengthOption));
//reading serialized HMM
DataInputStream modelStream = new DataInputStream(new FileInputStream(modelPath));
HmmModel model;
try {
model = LossyHmmSerializer.deserialize(modelStream);
} finally {
Closeables.close(modelStream, true);
}
//generating observations
int[] observations = HmmEvaluator.predict(model, length, System.currentTimeMillis());
//writing output
PrintWriter writer = new PrintWriter(new OutputStreamWriter(new FileOutputStream(output), Charsets.UTF_8), true);
try {
for (int observation : observations) {
writer.print(observation);
writer.print(' ');
}
} finally {
Closeables.close(writer, false);
}
} catch (OptionException e) {
CommandLineUtil.printHelp(optionGroup);
}
}
}