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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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package edu.stanford.nlp.optimization;

//import edu.stanford.nlp.util.StreamGobbler;
import edu.stanford.nlp.util.SystemUtils;

import java.io.*;
import java.util.regex.Pattern;

/**
 * Runs a cmdline to evaluate a dataset (assumes cmd takes input from stdin)
 *
 * @author Angel Chang
 */
public abstract class CmdEvaluator implements Evaluator {
  private static final Pattern cmdSplitPattern = Pattern.compile("\\s+");
  protected boolean saveOutput = false;
  private String outString;
  private String errString;
  protected String description;

  public abstract void setValues(double[] x);
  public abstract String[] getCmd();
  public abstract void outputToCmd(OutputStream outputStream);

  protected static String[] getCmd(String cmdStr)
  {
    if (cmdStr == null) return null;
    return cmdSplitPattern.split(cmdStr);
  }

  public String getOutput() {
    return outString;
  }

  public String getError() {
    return errString;
  }

  public String toString() {
    return description;
  }

  public void evaluateCmd(String[] cmd) {
    try {
      SystemUtils.ProcessOutputStream outputStream;
      StringWriter outSw = null;
      StringWriter errSw = null;
      if (saveOutput) {
        outSw = new StringWriter();
        errSw = new StringWriter();
        outputStream = new SystemUtils.ProcessOutputStream(cmd, outSw, errSw);
      } else {
        outputStream = new SystemUtils.ProcessOutputStream(cmd, new PrintWriter(System.err));
      }
      outputToCmd(outputStream);
      outputStream.close();
      if (saveOutput) {
        outString = outSw.toString();
        errString = errSw.toString();
      }
    } catch (IOException ex) {
      throw new RuntimeException(ex);
    }
  }

  public double evaluate(double[] x) {
    setValues(x);
    evaluateCmd(getCmd());
    return 0;
  }
}