public double classProb(int classIndex,Instance instance)
public double classProb(int classIndex, Instance instance, int theSubset)
  public double classProb(int classIndex,Instance instance)        throws Exception {        int theSubset = whichSubset(instance);    if (theSubset > -1)      return m_distribution.prob(classIndex,theSubset);    else      return m_distribution.prob(classIndex);  }