Notes/1-Sigmoid,-SoftMax,-Odds,-logOdds-1

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Notes/1-Sigmoid,-SoftMax,-Odds,-logOdds-1

tags:publishedNote Author:LYY 1 Sigmoid Transfer logit z to a probability by mapping z to (0,1). Definition: P=1+exp(−z)1​ Derivative: ∂z∂P​​=−(1+exp(−z))−2⋅exp(−z)⋅(−1)=(1+exp(−z))2exp(−z)​=1+exp(−z)1​⋅1+exp(−z)exp(−z)​=P⋅(1−P)>0​{P∈(0,1)} It means z↑,p↑ .

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