本文整理汇总了Java中cc.mallet.optimize.ConjugateGradient类的典型用法代码示例。如果您正苦于以下问题：Java ConjugateGradient类的具体用法？Java ConjugateGradient怎么用？Java ConjugateGradient使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
ConjugateGradient类属于cc.mallet.optimize包，在下文中一共展示了ConjugateGradient类的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: optimizeHyperparameters
import cc.mallet.optimize.ConjugateGradient; //导入依赖的package包/类
public void optimizeHyperparameters(
final Collection<TreeNode<TSGNode>> treeCorpus) {
final HyperparameterOptimizable optimizable = new HyperparameterOptimizable(
treeCorpus);
if (DO_GRADIENT_CHECK) {
final double[] gradient = new double[2];
optimizable.getValueGradient(gradient);
final double val1 = optimizable.getValue();
final double dx = 10E-8;
concentrationParameter += dx;
double val2 = optimizable.getValue();
final double empiricalConcentrationGradient = (val2 - val1) / dx;
System.out.println("GRADIENT CHECKING (a): computed:" + gradient[0]
+ " empirical:" + empiricalConcentrationGradient);
concentrationParameter -= dx;
geometricProbability += dx;
val2 = optimizable.getValue();
final double empiricalGeomGradient = (val2 - val1) / dx;
System.out.println("GRADIENT CHECKING (geom): computed:"
+ gradient[1] + " empirical:" + empiricalGeomGradient);
geometricProbability -= dx;
}
final ConjugateGradient optimizer = new ConjugateGradient(optimizable);
optimizer.setTolerance(1E-6);
try {
optimizer.optimize();
} catch (final IllegalArgumentException e) {
// This exception may be thrown if L-BFGS
// cannot step in the current direction.
// This condition does not necessarily mean that
// the optimizer has failed, but it doesn't want
// to claim to have succeeded...
LOGGER.severe("Failed to optimize: "
+ ExceptionUtils.getFullStackTrace(e));
}
LOGGER.info("Converged at: " + concentrationParameter + ", "
+ geometricProbability);
}