code: public void setEpsilon(double eps)
      {
          if(eps < 0 || Double.isInfinite(eps) || Double.isNaN(eps))
              throw new ArithmeticException("Regularization must be a positive value");
          this.eps = eps;
      }
docs: Sets the regularization to apply the the diagonal of the scatter matrix
  when creating each new metric.
  
  @param eps the regularization value