Catboost Categorical Features Handling Options (CTR settings)?
I found out that in order to set the ctr parameters and all the components one should pass a list of strings, each string should contain the ctrType and one of its component:


The first word of the string should be a ctrType for example Borders: (click here for catboost parameters)
Then one component of the ctrType should follow. For example TargetBorderType=5.
All together 'Borders:TargetBorderType=5'.
Repeat the procedure to set an other component and add the new string to the list.


Example with two components set:

simple_ctr = ['Borders:TargetBorderType=Uniform', 'Borders:TargetBorderCount=50']