优点：输出在 (−1,1)，比 sigmoid 居中，对梯度更友好
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This formula is satisfiable because if we set to b to true and a to false, then the whole formula is true. All other assignments make the formula false, but it doesn't change that the formula is satisfiable as long as there is at least one assignment makes the formula true.，更多细节参见同城约会
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