机器学习损失函数常用的函数

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))

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