单元测试的目标就是检验最小单元的代码是否像预期一样发挥作用。
The goal of unit testing is to verify whether the smallest unit of code behaves the way it is expected to.
估计GM(1,1)模型中的参数通常采用最小二乘准则，而在模型精度检验时又常采用平均相对误差。
Estimation of GM (1, 1) model parameter usually adopts the least square criterion, but test of model precision often USES average relative error criterion.
并通过最小二乘法线性拟合后进行显著性检验。
And significance test is carried out through least square fitting method.
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