Choosing the right learing rate when the graph isn't smooth

Part 1 (2020)
1

Hey guys,
I’ve used this lr_find function. I got this diagram:
image

Now I’m confused. How can I retrieve any insight from it? What learning rate should I choose then? (The steep doesn’t seem smooth at all. At any steeping range, it may reach only its local minimum)

Also, when is it advised to use the slice(lr_a,lr_b)?

Thanks