I am having some confusion related to the calculation of gradient.
My function $f(X) = g(X) + \lambda||X||_1$ where g(X) is convex and differentiable. I didn't get how the second expression when $X_{ij}=0$ is derived
2026-03-25 23:16:33.1774480593
Confusion related to the calculation of gradient
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Well I found the reason. It's related to minimum norm subgradient http://www.di.ens.fr/~mschmidt/Documents/2011_OPT_Chapter.pdf.