And it gains the coefficient of the smoothing formula based on the theory of non-linearity system optimization by minimizing the perplexity of the model, so as to ensure the superiority of the method.

• 进一步,利用非线性系统理论来,依据极小化困惑度方法,确定平滑公式中的系数值,从理论上保证了此平滑技术的优越性。