pair_preprocessor_ is None

First, thanks for adding this module - it is a great idea and a great contribution to transparent models.
When running your code there seems to be an old (I think) mapping in line 430 in gamchanger.py
# Use the ebm's mapping to map level name to bin index ebm_col_mapping = ebm_copy.pair_preprocessor_.col_mapping_

I think this relates to earlier versions of EBM
When I change this line to
ebm_col_mapping = ebm_copy.feature_groups_
The adjusted model is properly exported

Hi @esoreq, thanks for raising the issue. It seems you are looking at an older version of gamchanger.py? I made a lot of changes in 093a6b6, and the lines you refer too seem to be different now.

gam-changer/notebook-widget/gamchanger/gamchanger.py

Lines 526 to 527 in aba94f6

    
           # Use the ebm's mapping to map level name to bin index 
        
           ebm_col_mapping = ebm_copy.bins_

Can you try to update gamchanger to the latest version (0.1.13) and try again? pip install -U gamchanger. Let me know if you still encounter an error. Thanks!!

	# Use the ebm's mapping to map level name to bin index
	ebm_col_mapping = ebm_copy.bins_