機器學習損失函數常用的函數

sigmoid $\sigma(z) = \frac{1}{1+e^{-z}}$ 1 import matplotlib.pyplot as plt 2 import numpy as np 3 import math 4 import pandas as pd 5 6 z = np.arange(-10.,10.,0.1) 7 fz = 1/(1 + np.exp(-z))

>>阅读原文<<