Check if an estimator is fitted and visualize without modification

Don’t call fit on an already fitted estimator.

ModelVisualizer objects should be able to accept either a fitted or unfitted model; we shouldn’t call fit on the model if it’s already fitted, especially if fit() is a hook for drawing.

Moreover there are a series of visualizers that use fit() to draw themselves but only need information from the model, there should be a shortcut function for drawing these things (unless they need data).

[bbengfort]

Totally understood, no worries! The links and notes are very helpful!

[rebeccabilbro]

Awesome, thanks @amueller — this will be super helpful for our roadmap planning (happening later this month). Stay tuned!