近程函数
Short-range function
以上为机器翻译结果，长、整句建议使用 人工翻译 。
由于提高了对阶跃函数及其反函数的逼近程度，从而显著减少了优化迭代的次数。
Moreover, since the accuracy of approximating the step function is increased by taking a fast filter function as the filter function, number of iterations of optimization solution is greatly reduced.
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