Examples with LineSearcher edu.stanford.nlp.optimization.LineSearcher used on opensource projects

Example 1 with LineSearcher

use of edu.stanford.nlp.optimization.LineSearcher in project CoreNLP by stanfordnlp.

the class CRFBiasedClassifier method adjustBias.

/**
   * Adjust the bias parameter to optimize some objective function.
   * Note that this function only tunes the bias parameter of one class
   * (class of index 0), and is thus only useful for binary classification
   * problems.
   */
public void adjustBias(List<List<IN>> develData, Function<Double, Double> evalFunction, double low, double high) {
    LineSearcher ls = new GoldenSectionLineSearch(true, 1e-2, low, high);
    CRFBiasedClassifierOptimizer optimizer = new CRFBiasedClassifierOptimizer(this, evalFunction);
    double optVal = ls.minimize(optimizer);
    int bi = featureIndex.indexOf(BIAS);
    log.info("Class bias of " + weights[bi][0] + " reaches optimal value " + optVal);
}