目录
公式
$ g(z) = frac{1}{1+e^{-z}} $
- (g:mathbb{R} o [0,1])
- (g(0)=0.5)
- (g(- infty)=0)
- (g(+ infty)=1)
def sigmoid(z):
return 1 / (1 + np.exp(-z))
nums = np.arange(-10, 10, step=1) #creates a vector containing 20 equally spaced values from -10 to 10
fig, ax = plt.subplots(figsize=(12,4))
ax.plot(nums, sigmoid(nums), 'r')
