furian-rising

I've had similar issues and commented the following on #[keras-team/keras](https://github.com/keras-team/keras/issues/13586), pasted below for convenience. > Under sklearn.model_selection._search.py (sklearn version 0.22.1) line 735, nested clone call seems to be responsible: >...

Here's what I ended up doing: https://github.com/scikit-learn/scikit-learn/issues/15722#issuecomment-589264317