Group Lasso Penalty

Problem

Compute the group lasso penalty: the sum over groups of the Euclidean norm sqrt(sum(w_j^2)).

Hint

Groups of coefficients are regularized jointly with an L2 norm.

case 1

in: [[[3,4]]]

expected: 5

case 2

in: [[[1,0],[0,1]]]

expected: 2

case 3

in: [[[2,2,1]]]

expected: 3

case 4

in: [[]]

expected: 0

Starter codePython

def group_lasso_penalty(groups):
    # Your code here
    pass

4 test cases · run your code against them in the editor