/*
* 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 opennlp.tools.cmdline.postag;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.nio.charset.Charset;
import opennlp.tools.cmdline.CLI;
import opennlp.tools.cmdline.CmdLineTool;
import opennlp.tools.cmdline.CmdLineUtil;
import opennlp.tools.cmdline.TerminateToolException;
import opennlp.tools.postag.POSDictionary;
import opennlp.tools.postag.POSModel;
import opennlp.tools.postag.POSSample;
import opennlp.tools.postag.WordTagSampleStream;
import opennlp.tools.util.ObjectStream;
import opennlp.tools.util.PlainTextByLineStream;
public final class POSTaggerTrainerTool implements CmdLineTool {
public String getName() {
return "POSTaggerTrainer";
}
public String getShortDescription() {
return "trains a model for the part-of-speech tagger";
}
public String getHelp() {
return "Usage: " + CLI.CMD + " " + getName() + " " + TrainingParameters.getParameterUsage()
+ " -data trainingData -model model\n" +
TrainingParameters.getDescription();
}
static ObjectStream<POSSample> openSampleData(String sampleDataName,
File sampleDataFile, Charset encoding) {
CmdLineUtil.checkInputFile(sampleDataName + " Data", sampleDataFile);
FileInputStream sampleDataIn = CmdLineUtil.openInFile(sampleDataFile);
ObjectStream<String> lineStream = new PlainTextByLineStream(sampleDataIn
.getChannel(), encoding);
return new WordTagSampleStream(lineStream);
}
public void run(String[] args) {
if (args.length < 8) {
System.out.println(getHelp());
throw new TerminateToolException(1);
}
TrainingParameters parameters = new TrainingParameters(args);
if(!parameters.isValid()) {
System.out.println(getHelp());
throw new TerminateToolException(1);
}
File trainingDataInFile = new File(CmdLineUtil.getParameter("-data", args));
File modelOutFile = new File(CmdLineUtil.getParameter("-model", args));
CmdLineUtil.checkOutputFile("pos tagger model", modelOutFile);
ObjectStream<POSSample> sampleStream = openSampleData("Training", trainingDataInFile,
parameters.getEncoding());
POSModel model;
try {
// TODO: Move to util method ...
POSDictionary tagdict = null;
if (parameters.getDictionaryPath() != null) {
tagdict = new POSDictionary(parameters.getDictionaryPath());
}
// depending on model and sequence choose training method
model = opennlp.tools.postag.POSTaggerME.train(parameters.getLanguage(),
sampleStream, parameters.getModel(), tagdict, null, parameters.getCutoff(), parameters.getNumberOfIterations());
}
catch (IOException e) {
CmdLineUtil.printTrainingIoError(e);
throw new TerminateToolException(-1);
}
finally {
try {
sampleStream.close();
} catch (IOException e) {
// sorry that this can fail
}
}
CmdLineUtil.writeModel("pos tagger", modelOutFile, model);
}
}