How do we get learning rate alpha

Screen Link:
https://app.dataquest.io/m/237/gradient-descent/3/derivative-of-the-cost-function

My Code:

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What I expected to happen:

What actually happened:

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How to we get learning rate alpha ?

You don’t get it, you provide it. It’s an input.

I didn’t read this, but it looks like a simple explanation on how to handle the learning rate.

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