DLS 2 Week 1 Programming Assignment 2 - About Notation

Hi! I need some clarification about the Regularization equation. I’m trying to learn the math procedure but I’m confused about the notation of the 5.2 equation on the Notebook. What do k and j refer to on the Regularization part? Also, the ^2 is confusing, but I know is an exponential weight.

Thanks in advance for the answer!

Have a look at Prof Andrew Ng’s lecture:

Your question is covered around the 5 minute mark.