I understand that because we need a convex for J(w,b), that’s why this equation with log is J(w,b) for logistic regression. And of course, it can be used to monitor the cost along the way. But I don’t see how it contributes to the logistic regression’s gradient descent. The gradient descent is very …

What's the usage of J(w,b) for logistic regression?

Course Q&A Machine Learning Specialization Supervised ML: Regression and Classification

rmwkwok July 6, 2023, 12:53am 3

We use logistic regression’s cost function to derive logistic regression’s gradients as well. If you are looking for the steps to derive them, check out this post’s “Derivation steps 2: logistic regression”. You will see how it ends up the same look as the gradients for linear regression.

Cheers,
Raymond

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What's the usage of J(w,b) for logistic regression?

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