By introducing a sensitivity parameter, the original optimal output tracking control problem is transformed into a series of two-point boundary value problems without time-advance or time-delay terms.

通过引入一个灵敏度参数，将原最优输出跟踪控制问题转化为不含超前项和时滞项的一族两点边值问题。

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The parameter control methods are in the contrast, which is to find a sequence of parameters that converge to optimal value and its corresponding pointsinconverge to optimal solution.

参数控制算法的基本思想正好相反，它是构造参数序列来逼近最优值，相应的迭代点列逼近最优点。

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We also find that a larger value of the parameter over the optimal value mentioned above will lead to over-pruning which may decrease the tree's test accuracy .

而再度增大的此参数值（已超出该区间）却会导致树的过度剪枝，使树的测试精度降低。

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