R2 value

[Z-xk]

First of all, thank you for the author's strong contribution. This is a great work. Secondly, how can I get the R2 value of the model? For tasks that require testing a large number of data sets to obtain the optimal model, it is important to obtain the R2 of each model. However, I tried to find it in the source code, and there is no corresponding method or attribute that can directly obtain the overall R2 or segmented R2 of the model. If the author can improve it, it will be very grateful!