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fixed EC typo
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J(a_{0},a_{1})=1/m\sum_{i=1}^{n}\left[-y_{i}\log(\sigma(t_{i}))-(1-y_{i})\log((1-\sigma(t_{i})))\right] | ||
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\frac{\partial J}{\partial a_{i}}=1/m\sum_{k=1}^{N}\left(\sigma(t_{k})-y_{k}\right)x_{k}^{i} | ||
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\sigma(t)=\frac{1}{1+e^{-t}} | ||
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t=a_{0}+a_{1}x |
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x_{k}^{i} |