Change to cost-utility exploration without LLM scoring

[djiajunustc]

Dear author,

Thanks for the excellent work and open-source code.
I wonder how to re-implement the cost-utility exploration without LLM (second setting in Table II).

Should I commend line 794 to line 816 in the main_frontier_zeroshop.py and always choose global_tiem as 0?
It seems that the cost-utility exploration in this codebase is to encourage choosing the frontier with the largest area in a given distance.

Please correct me if I'm wrong.

Many thanks,
Jiajun