逻辑回归用sigmoid

逻辑回归使用sigmoid函数的目的是将自变量的值映射到(0,1)的范围内，这个值可以被解释为属于某一类别的概率。sigmoid函数是一个连续、单调递增并且关于(0,0.5)中心对称的函数，这些性质使得它非常适合用于逻辑回归中。通过对sigmoid函数求导，可以得到关于自变量的梯度，进而可以用梯度下降等优化算法来估计逻辑回归模型的参数。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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