损失函数

1 Square loss
    
 
2 Hinge loss
 
3 Logistic loss
 
4 Cross entropy loss
   Using the alternative label convention,so that,
    the cross entropy loss is defined as
      
 
  1. x = np.linspace(-3, 3, 1000)
  2. y_logit = np.log(1 + np.exp(-x)) / math.log(2)
  3. y_01 = x < 0
  4. y_hinge = 1 - x
  5. y_hinge[y_hinge < 0] = 0


 




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原文地址：https://www.cnblogs.com/iathena/p/adff097f87efcb087139ca5948015f93.html