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What is the dual function of this non-overlapping Group Lasso's penalty?
I'm trying to find the dual function of this function (non-overlapping Group Lasso's penalty function):
$$ \mathfrak{h}: \mathbb{R}^p \to [0,\infty], \ a \mapsto \sum_{j=1}^{k} \left\| a_{\mathscr{A}...
