www-ai.cs.tu-dortmund.de/LEHRE/VORLESUNGEN/NOPT/SS14/hw/hw-01.pdf
symmetric (in this case, f is twice continuously differentiable). What is ∇2f(x) when H is not symmetric?
6. For f(x) = 1 2 ‖y−Ax‖22 where x ∈ Rn, y ∈ Rk, and A ∈ Rk×n, derive the
expressions of ∇f(x) and ∇2f(x) …