Access objective function from python

#1

Dear experts,

I am trying to implement a custom objective function (focal loss) on xgboost and to make sure I got it right I would like to compare it against the normal logistic objective. How do I access the such function? Where do I find it?

Thanks!

#2

All existing objectives are implemented in C++. See https://github.com/dmlc/xgboost/blob/master/src/objective/regression_obj.cu

#3

forgive my naivete- how would i call it from python? would i need to write a custom wrapper?