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p(y=ix)=softmax(fθ(x))[i]=exp(fθ,i(x))j=1Nexp(fθ,j(x))\displaystyle p(y=i \mid x)=\operatorname{softmax}\left(f_{\theta}(x)\right)[i]=\frac{\exp \left(f_{\theta, i}(x)\right)}{\sum_{j=1}^{N} \exp \left(f_{\theta, j}(x)\right)}

Softmax