add UserPerObjMetric as a regression objective #1180
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PR Objective:
Allow for users to use a custom defined metric as regression objective
What Changed:
Other Notes:
This is necessary to add to allow custom objective functions in c++ to be used in the CatBoostRegressor model in python. Python checks if the specified loss function is inside the RegressionObjectives by way of
is_regression_objectivein core.py that calls on the .so file