Pytorch損失函數

定義 損失函數(Loss Function) L o s s = f ( a ^ , y ) Loss=f( \hat{a} ,y) Loss=f(a^,y) 代價函數(Cost Function) C o s t = 1 N ∑ i N f ( y i ^ , y i ) Cost=\frac{1}{N}\sum_{i}^{N}f(\hat{y_{i}},y_{i}) Cost=N1​i∑N​f

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