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The Berkeley parser analyzes the grammatical structure of natural language using probabilistic context-free grammars (PCFGs).

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package edu.berkeley.nlp.classify;

import java.io.Serializable;

import edu.berkeley.nlp.util.Counter;

/**
 * Feature extractors process input instances into feature counters.
 *
 * @author Dan Klein
 */
public interface FeatureExtractor extends Serializable {
  Counter extractFeatures(I instance);
}