forked from jweese/thrax
/
RarityPenaltyFeature.java
46 lines (34 loc) · 1.18 KB
/
RarityPenaltyFeature.java
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package edu.jhu.thrax.hadoop.features.annotation;
import java.util.Map;
import java.util.Set;
import org.apache.hadoop.io.FloatWritable;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.mapreduce.Reducer.Context;
import edu.jhu.thrax.hadoop.datatypes.Annotation;
import edu.jhu.thrax.hadoop.datatypes.RuleWritable;
import edu.jhu.thrax.hadoop.jobs.ThraxJob;
import edu.jhu.thrax.util.Vocabulary;
@SuppressWarnings("rawtypes")
public class RarityPenaltyFeature implements AnnotationFeature {
public static final String NAME = "rarity";
private static final FloatWritable ZERO = new FloatWritable(0.0f);
public String getName() {
return NAME;
}
public void unaryGlueRuleScore(int nt, Map<Integer, Writable> map) {
map.put(Vocabulary.id(NAME), ZERO);
}
public void binaryGlueRuleScore(int nt, Map<Integer, Writable> map) {
map.put(Vocabulary.id(NAME), ZERO);
}
@Override
public Writable score(RuleWritable r, Annotation annotation) {
return new FloatWritable((float) Math.exp(1 - annotation.count()));
}
@Override
public void init(Context context) {}
@Override
public Set<Class<? extends ThraxJob>> getPrerequisites() {
return null;
}
}