Logistic unitOdds에 log를 취해면 0.5를 대칭으로 −∞<y<∞-\infty < y < \infty−∞<y<∞ 로 boundg(z)=11+e−zg(z) = \frac{1}{1 + e^{-z}}g(z)=1+e−z1This is importantg′(z)=g(z)(1−g(z))g'(z) = g(z)(1 - g(z))g′(z)=g(z)(1−g(z))
