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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.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;

/**
 * 

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.

* *

Only works on basic text, where the value in the SequenceFile is a blob of text.

*/ //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); if (!finished) { throw new IllegalStateException("Job failed!"); } } }




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