public void setSigma(double sigma) {
   logPrior.setSigma(sigma);
 }
 public double getSigma() {
   return logPrior.getSigma();
 }
 /** Sets the epsilon value for {@link LogConditionalObjectiveFunction}. */
 public void setEpsilon(double eps) {
   logPrior.setEpsilon(eps);
 }