C1_W1_Lab03_Cost_function_Sol

Course Q&A Machine Learning Specialization Supervised ML: Regression and Classification
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On the contour plot at [C1_W1_Lab03_Cost_function_Sol]

I’m clicking through points on one of the lines in the contour plot, but they show different costs for J(w,b). My understanding is that the contour lines represent a cross-section of the 3D cost function at a certain height (i.e., constant cost J(w,b)), so I expect every point on the same contour line to show the same cost value. Am I misinterpreting?

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If you’re referring to the right side of this plot…

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… you have to be extremely careful to click exactly on the lines of constant cost.

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You are right. The contour plot allows the user to select any point, even those empty spaces outside of the lines. Thank you! :smile: