How leave's scores are calculated in this XGBoost trees?

Question

I am looking at the below image.

Can someone explain how they are calculated? I though it was -1 for an N and +1 for a yes but then I can\'t figure out how the litt

Answer 1

Read this

https://towardsdatascience.com/xgboost-mathematics-explained-58262530904a

and then this

https://medium.com/@gabrieltseng/gradient-boosting-and-xgboost-c306c1bcfaf5

and the appendix

https://gabrieltseng.github.io/appendix/2018-02-25-XGB.html