Question on Solving SPCTSP with UDC

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Thanks for your excellent research! I have a question on solving SPCTSP with UDC (https://github.com/CIAM-Group/NCO_code/tree/main/single_objective/UDC-Large-scale-CO-master/UDC/SPCTSP-AGNN-POMO).

In SPCTSP, the real collected prize of each node only becomes known upon visitation. Due to the uncertainty, a fixed tour planned before visitation could be invalid. In my understanding, it is only allow to reveal the real prize when planning the final tour.

In UDC, do you reveal the real prize during each conquering step, or only during the final conquering step? How do you ensure the validity of the final tour?

Hope for your clarification. Thank you.