/*
* 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.vectorizer;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.SequenceFileOutputFormat;
import org.apache.mahout.common.HadoopUtil;
import org.apache.mahout.math.VectorWritable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
/**
* <p>Runs a Map/Reduce job that encodes {@link org.apache.mahout.vectorizer.encoders.FeatureVectorEncoder} the
* input and writes it to the output as a sequence file.</p>
*
* <p>Only works on basic text, where the value in the SequenceFile is a blob of text.</p>
*/
//TODO: find commonalities w/ DictionaryVectorizer and abstract them out
public class SimpleTextEncodingVectorizer implements Vectorizer {
private static final Logger log = LoggerFactory.getLogger(SimpleTextEncodingVectorizer.class);
@Override
public void createVectors(Path input, Path output, VectorizerConfig config)
throws IOException, ClassNotFoundException, InterruptedException {
//do this for convenience of using prepareJob
Job job = HadoopUtil.prepareJob(input, output,
SequenceFileInputFormat.class,
EncodingMapper.class,
Text.class,
VectorWritable.class,
SequenceFileOutputFormat.class,
config.getConf());
Configuration conf = job.getConfiguration();
conf.set(EncodingMapper.USE_SEQUENTIAL, String.valueOf(config.isSequentialAccess()));
conf.set(EncodingMapper.USE_NAMED_VECTORS, String.valueOf(config.isNamedVectors()));
conf.set(EncodingMapper.ANALYZER_NAME, config.getAnalyzerClassName());
conf.set(EncodingMapper.ENCODER_FIELD_NAME, config.getEncoderName());
conf.set(EncodingMapper.ENCODER_CLASS, config.getEncoderClass());
conf.set(EncodingMapper.CARDINALITY, String.valueOf(config.getCardinality()));
job.setNumReduceTasks(0);
boolean finished = job.waitForCompletion(true);
log.info("result of run: {}", finished);
//TODO: something useful w/ this result should it be meaningful.
}
}