What type of regularization used in the course?

I know two types: l1 and l2. Don’t know the difference but seen using l2 is better.

Which kind of regularization is this?

Also can you provide me the formula for different kind of regularizer?

One more question, regularization is used in machine learning only, in deep learning and neural nets it is not used?

Here is a nice article you can read about it.

(found via an internet search).

Regularization can be used in any supervised learning method.

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This is l2 regularization. I get it. Thank you @TMosh