edu.stanford.nlp.maxent.Problem Maven / Gradle / Ivy

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Stanford CoreNLP provides a set of natural language analysis tools which can take raw English language text input and give the base forms of words, their parts of speech, whether they are names of companies, people, etc., normalize dates, times, and numeric quantities, mark up the structure of sentences in terms of phrases and word dependencies, and indicate which noun phrases refer to the same entities. It provides the foundational building blocks for higher level text understanding applications.

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/**
 * Title:        StanfordMaxEnt
 * Description:  A Maximum Entropy Toolkit

 * Copyright:    Copyright (c) Trustees of Leland Stanford University
 * Company:      Stanford University
 */

package edu.stanford.nlp.maxent;

import edu.stanford.nlp.io.PrintFile;


/**
 * This is a general class for a Problem to be solved by the MaxEnt toolkit.
 * There have to be experiments and features.
 *
 * @author Kristina Toutanova
 * @version 1.0
 */
public class Problem {

  public int exSize;
  public int fSize;

  /**
   * This is the training data.
   */
  public Experiments data;

  /**
   * These are the features.
   */
  public Features functions;

  public Problem(Experiments d, Features f) {
    data = d;
    functions = f;
    exSize = d.size();
    fSize = f.size();
  }

  public Problem() {
  }


  public void add(Feature f) {
    functions.add(f);
    fSize++;
  }


  public void removeLast() {
    functions.removeLast();
    fSize--;
  }

  public void print() {
    System.out.println(" Problem printing ");
    data.print();
    System.out.println(" Function printing ");
    for (int i = 0; i < fSize; i++) {
      functions.get(i).print();
    }
  }

  public void print(String filename) {
    try {
      PrintFile pf = new PrintFile(filename);
      pf.println(" Problem printing ");
      data.print(pf);
      pf.println(" Function printing ");
      for (int i = 0; i < fSize; i++) {
        functions.get(i).print(pf);
      }
    } catch (Exception e) {
      System.out.println("Exception in Problem.print()");
    }
  }

  /*
  // This is broken... it's not clear what it's supposed to do, but
  // class Experiments requires a "vArray" to function correctly.
  // Otherwise you just can't run ptilde on it.  If that makes sense
  // to you, please do everyone a favor and fix this test program or
  // at least document what those fields mean.  -horatio
  public static void main(String[] args) {
    double[] f1 = {0, 1, 1, 0, 1, 1};
    double[] f2 = {1, 0, 1, 1, 0, 1};
    Experiments gophers = new Experiments();
    for (int i = 0; i < 3; i++) {
      gophers.add(new Experiments());
    }
    for (int i = 0; i < 3; i++) {
      gophers.add(new Experiments());
    }
    gophers.ptilde();
    Index instanceIndex = gophers.createIndex();
    Features feats = new Features();
    feats.add(new Feature(gophers, f1, instanceIndex));
    feats.add(new Feature(gophers, f2, instanceIndex));
    Problem p = new Problem(gophers, feats);
    System.out.println(p.exSize);
    System.out.println(p.functions.get(1).ftilde());
  }
  */
}