Hello there, for Lesson 1 and 2 Jeremy uses lr_finder just before stage 2(fine tuning). But in Lesson 3 with the Planet problem, Jeremy suddenly start using lr_finder before stage 1 as well. So I am confused, should we use lr_finder() for guidance in any case or only Lesson 3 problems (multi-label classification, segmentation, regression) requires usage of lr_finder before stage 1. Thanks in advance. 
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