Optional Lab: Feature scaling and Learning Rate (Multi-variable)

[Bilel_Djemel]

This text tells gradient descent with 𝛼 = 9e-7 runs faster than gradient descent with
𝛼 = 1e-7. But I have tried both gradient descents with a number of iterations equal to 20.

I turns out that the second example ,with 20 iterations , almost reaches the minimum, meanwhile
the fist example with the same number of iteration is still far from the minimum which contradicts the text in the first image.

[rmwkwok]

We need to run more iterations to see which one wins at last.

Raymond