org.apache.mahout.classifier.bayes.mapreduce.common.BayesTfIdfDriver.java Source code

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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.classifier.bayes.mapreduce.common;

import java.io.IOException;
import java.util.Map;

import org.apache.hadoop.conf.Configurable;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.client.HBaseAdmin;
import org.apache.hadoop.io.DefaultStringifier;
import org.apache.hadoop.io.DoubleWritable;
import org.apache.hadoop.mapred.FileInputFormat;
import org.apache.hadoop.mapred.FileOutputFormat;
import org.apache.hadoop.mapred.JobClient;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.SequenceFileInputFormat;
import org.apache.hadoop.util.GenericsUtil;
import org.apache.mahout.classifier.bayes.common.BayesParameters;
import org.apache.mahout.classifier.bayes.io.SequenceFileModelReader;
import org.apache.mahout.common.HadoopUtil;
import org.apache.mahout.common.StringTuple;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/** The Driver which drives the Tf-Idf Generation */
public class BayesTfIdfDriver implements BayesJob {

    private static final Logger log = LoggerFactory.getLogger(BayesTfIdfDriver.class);

    @Override
    public void runJob(Path input, Path output, BayesParameters params) throws IOException {

        Configurable client = new JobClient();
        JobConf conf = new JobConf(BayesWeightSummerDriver.class);
        conf.setJobName("TfIdf Driver running over input: " + input);

        conf.setOutputKeyClass(StringTuple.class);
        conf.setOutputValueClass(DoubleWritable.class);

        FileInputFormat.addInputPath(conf, new Path(output, "trainer-termDocCount"));
        FileInputFormat.addInputPath(conf, new Path(output, "trainer-wordFreq"));
        FileInputFormat.addInputPath(conf, new Path(output, "trainer-featureCount"));
        Path outPath = new Path(output, "trainer-tfIdf");
        FileOutputFormat.setOutputPath(conf, outPath);

        // conf.setNumMapTasks(100);

        conf.setJarByClass(BayesTfIdfDriver.class);

        conf.setMapperClass(BayesTfIdfMapper.class);
        conf.setInputFormat(SequenceFileInputFormat.class);
        conf.setCombinerClass(BayesTfIdfReducer.class);

        conf.setReducerClass(BayesTfIdfReducer.class);

        conf.setOutputFormat(BayesTfIdfOutputFormat.class);

        conf.set("io.serializations",
                "org.apache.hadoop.io.serializer.JavaSerialization,org.apache.hadoop.io.serializer.WritableSerialization");
        // Dont ever forget this. People should keep track of how hadoop conf
        // parameters and make or break a piece of code

        FileSystem dfs = FileSystem.get(outPath.toUri(), conf);
        HadoopUtil.overwriteOutput(outPath);

        Path interimFile = new Path(output, "trainer-docCount/part-*");

        Map<String, Double> labelDocumentCounts = SequenceFileModelReader.readLabelDocumentCounts(dfs, interimFile,
                conf);

        DefaultStringifier<Map<String, Double>> mapStringifier = new DefaultStringifier<Map<String, Double>>(conf,
                GenericsUtil.getClass(labelDocumentCounts));

        String labelDocumentCountString = mapStringifier.toString(labelDocumentCounts);
        log.info("Counts of documents in Each Label");
        Map<String, Double> c = mapStringifier.fromString(labelDocumentCountString);
        log.info("{}", c);

        conf.set("cnaivebayes.labelDocumentCounts", labelDocumentCountString);
        log.info(params.print());
        if (params.get("dataSource").equals("hbase")) {
            String tableName = output.toString();
            HBaseConfiguration hc = new HBaseConfiguration(new Configuration());
            HTableDescriptor ht = new HTableDescriptor(tableName);
            HColumnDescriptor hcd = new HColumnDescriptor(BayesConstants.HBASE_COLUMN_FAMILY + ':');
            hcd.setBloomfilter(true);
            hcd.setInMemory(true);
            hcd.setMaxVersions(1);
            hcd.setBlockCacheEnabled(true);
            ht.addFamily(hcd);

            log.info("Connecting to hbase...");
            HBaseAdmin hba = new HBaseAdmin(hc);
            log.info("Creating Table {}", output);

            if (hba.tableExists(tableName)) {
                hba.disableTable(tableName);
                hba.deleteTable(tableName);
                hba.majorCompact(".META.");
            }
            hba.createTable(ht);
            conf.set("output.table", tableName);
        }
        conf.set("bayes.parameters", params.toString());

        client.setConf(conf);

        JobClient.runJob(conf);
    }
}