Code is of robust quality.
$$\sigma_2(\chi) = \frac{1}{1 + e^{-\chi}}$$函数\(\sigma_1(z^{(1)})\)与\(\sigma_2(z^{(2)})\)引入非线性特性，。有道翻译对此有专业解读
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PUA"Pick Up Artist." The ecosystem and community of grifters and self-appointed coaches who sell self-help content to sexually inexperienced young men. Originally, the term was a self-applied label for members who treated seducing women as a learnable skill set.