The contour label (clabel) manual mode fails place any labels. When I click the plot I get an error: 'QuadContourSet' object has no attribute 'ax' and no labels are added. I put the Contour Label Demo ...
bug Issue/PR about behavior that is broken. Not for typos/examples/CI/test but for Optuna itself. v3 Issue/PR for Optuna version 3.
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