I'm reading a tutorial about ANN. They use the following cost function:
As you can see this equation includes a norm. I'm new to the concept of norm.
My question is what kind of norm they use here (There are Absolute-value norm, Euclidean norm, Euclidean norm of a complex number, Taxicab norm, Manhattan norm, p-norm, Maximum norm, infinity norm, uniform norm, supremum norm, Zero norm, etc.)