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$$Cost(h_路\theta路(路x_i路),y_i)路=路路路\begin{Bmatrix}-路
\log(h_路\theta路(路x_i路)),路\路if路\路y_i=1路路\\-路\log(1-h_路
\theta路(路x_i路)),路\路if路\路y_i=0\end{Bmatrix}路路路$$路露
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Cost(h_ \theta ( x_i ),y_i) = \begin{Bmatrix}- \log(h_ \theta ( x_i )), \ if \ y_i=1 \\- \log(1-h_ \theta ( x_i )), \ if \ y_i=0\end{Bmatrix}
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Author: Kenneth WU 454