Gradient descent can converge to any isolated saddle point
nonconvex
saddles
The difference-of-Hadamard lift of the 1-norm regularizer enjoys \(2 \Rightarrow 1\)
nonconvex
lift
sparse
The usual smooth lift of the nuclear norm regularizer enjoys \(2 \Rightarrow 1\)
nonconvex
lift
rank
Saddle avoidance and stable manifold: a proof from first principles for a simple setup
nonconvex
saddles
CSMT
Benign landscape of low-rank approximation: Part II
nonconvex
rank
Small geodesic triangles
manifolds
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