code: package edu.jhu.thrax.hadoop.jobs;
  
  import java.io.IOException;
  import java.util.HashSet;
  import java.util.Set;
  
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.io.FloatWritable;
  import org.apache.hadoop.io.IntWritable;
  import org.apache.hadoop.io.LongWritable;
  import org.apache.hadoop.mapreduce.Job;
  import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
  import org.apache.hadoop.mapreduce.lib.output.SequenceFileOutputFormat;
  import org.apache.hadoop.mapreduce.lib.reduce.IntSumReducer;
  
  import edu.jhu.thrax.hadoop.features.WordLexicalProbabilityCalculator;
  
  public abstract class WordLexprobJob implements ThraxJob {
    public static final String SOURCE_GIVEN_TARGET = "thrax.__wordlexprob_sgt";
    private boolean isSourceGivenTarget;
  
    public WordLexprobJob(boolean isSrcGivenTgt) {
      isSourceGivenTarget = isSrcGivenTgt;
    }
  
    public Set<Class<? extends ThraxJob>> getPrerequisites() {
      Set<Class<? extends ThraxJob>> result = new HashSet<Class<? extends ThraxJob>>();
      result.add(VocabularyJob.class);
      return result;
    }
  
    public Job getJob(Configuration conf) throws IOException {
      Configuration theConf = new Configuration(conf);
      theConf.setBoolean(SOURCE_GIVEN_TARGET, isSourceGivenTarget);
      Job job = new Job(theConf, getName());
      job.setJarByClass(WordLexicalProbabilityCalculator.class);
      job.setMapperClass(WordLexicalProbabilityCalculator.Map.class);
      job.setCombinerClass(IntSumReducer.class);
      
      job.setPartitionerClass(WordLexicalProbabilityCalculator.Partition.class);
      job.setReducerClass(WordLexicalProbabilityCalculator.Reduce.class);
  
      job.setMapOutputKeyClass(LongWritable.class);
      job.setMapOutputValueClass(IntWritable.class);
      
      int numReducers = conf.getInt("thrax.reducers", conf.getInt("mapreduce.job.reduces", DefaultValues.DEFAULT_NUM_REDUCERS));
      job.setNumReduceTasks(numReducers);
  
      job.setOutputKeyClass(LongWritable.class);
      job.setOutputValueClass(FloatWritable.class);
  
      job.setOutputFormatClass(SequenceFileOutputFormat.class);
  
      FileInputFormat.setInputPaths(job, new Path(conf.get("thrax.input-file")));
      int maxSplitSize = conf.getInt("thrax.max-split-size", 0);
      if (maxSplitSize != 0) {
        FileInputFormat.setMaxInputSplitSize(job, maxSplitSize);
      }
      return job;
    }
  }
  