Cloning CalibratedClassifierCV with prefit base_estimator

[glouppe]

I recently stumbled upon this issue, I needed to clone a CalibratedClassifierCV object when the latter is defined on top on a pre-fit (cv="prefit") base estimator. Unfortunately, because of the semantic of the clone interface, this cannot be achieved without "unfitting" the pre-fit base estimator.

I think this is somehow related to @jnothman long standing frozen estimator discussion.

[GaelVaroquaux]

Brainstorming: Can we have a method on CV objects that return a non CV object with the corresponding parameters set?

[amueller]

@GaelVaroquaux how would that help?

[amueller]

Not sure but in a recent discussion I though "hey there is no way this works with current API"... and then today I see this issue that I totally forgot about that.

[tengerye]

Hi, I have the same problem recently, so what's plan? Since this issue was opened two years ago, any problem so far? I am familiar with Transfer Learning as well and you can verify that on my repositories. I am glad to help.

[jnothman]

Sorry we do not have a solution yet.