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Scalable machine learning libraries
/**
* 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.df.tools;
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.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.apache.mahout.common.CommandLineUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.util.Arrays;
/**
* Compute the frequency distribution of the "class label"
* This class can be used when the criterion variable is the categorical attribute.
*/
@Deprecated
public final class Frequencies extends Configured implements Tool {
private static final Logger log = LoggerFactory.getLogger(Frequencies.class);
private Frequencies() { }
@Override
public int run(String[] args) throws IOException, ClassNotFoundException, InterruptedException {
DefaultOptionBuilder obuilder = new DefaultOptionBuilder();
ArgumentBuilder abuilder = new ArgumentBuilder();
GroupBuilder gbuilder = new GroupBuilder();
Option dataOpt = obuilder.withLongName("data").withShortName("d").withRequired(true).withArgument(
abuilder.withName("path").withMinimum(1).withMaximum(1).create()).withDescription("Data path").create();
Option datasetOpt = obuilder.withLongName("dataset").withShortName("ds").withRequired(true).withArgument(
abuilder.withName("path").withMinimum(1).create()).withDescription("dataset path").create();
Option helpOpt = obuilder.withLongName("help").withDescription("Print out help").withShortName("h")
.create();
Group group = gbuilder.withName("Options").withOption(dataOpt).withOption(datasetOpt).withOption(helpOpt)
.create();
try {
Parser parser = new Parser();
parser.setGroup(group);
CommandLine cmdLine = parser.parse(args);
if (cmdLine.hasOption(helpOpt)) {
CommandLineUtil.printHelp(group);
return 0;
}
String dataPath = cmdLine.getValue(dataOpt).toString();
String datasetPath = cmdLine.getValue(datasetOpt).toString();
log.debug("Data path : {}", dataPath);
log.debug("Dataset path : {}", datasetPath);
runTool(dataPath, datasetPath);
} catch (OptionException e) {
log.warn(e.toString(), e);
CommandLineUtil.printHelp(group);
}
return 0;
}
private void runTool(String data, String dataset) throws IOException,
ClassNotFoundException,
InterruptedException {
FileSystem fs = FileSystem.get(getConf());
Path workingDir = fs.getWorkingDirectory();
Path dataPath = new Path(data);
Path datasetPath = new Path(dataset);
log.info("Computing the frequencies...");
FrequenciesJob job = new FrequenciesJob(new Path(workingDir, "output"), dataPath, datasetPath);
int[][] counts = job.run(getConf());
// outputing the frequencies
log.info("counts[partition][class]");
for (int[] count : counts) {
log.info(Arrays.toString(count));
}
}
public static void main(String[] args) throws Exception {
ToolRunner.run(new Configuration(), new Frequencies(), args);
}
}
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