code: public double computePredictedReduction( DMatrixRMaj p ) {
  		return -CommonOps_DDRM.dot(gradient,p) - 0.5*hessian.innerVectorHessian(p);
  	}
docs: Computes predicted reduction for step 'p'
  
  @param p Change in state or the step
  @return predicted reduction in quadratic model