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In logistic regression, we predict Class 1 when
$$
\sigma\left(\mathbf{w}^{T} \mathbf{x}+b\right)>0.5
$$
What is the equation of the decision boundary?

A. $\mathbf{w}^{T} \mathbf{x}+b=1$
B. $\mathbf{w}^{T} \mathbf{x}+b=0.5$
C. $\mathbf{w}^{T} \mathbf{x}+b=0$
D. $\mathbf{w}^{T} \mathbf{x}+b=-1$
 

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