A Cubic Regularized Newton's Method over Riemannian Manifolds

Understand

In this paper we present a cubic regularized Newton's method to minimize a smooth function over a Riemannian manifold.

• The proposed algorithm is shown to reach a second-order $\epsilon$-stationary point within $\mathcal{O}(1/\epsilon^{\frac{3}{2}})$ iterations, under the condition that the pullbacks are locally Lipschitz continuous, a condition that is shown to be satisfied if the manifold is compact.
• Furthermore, we present a local superlinear convergence result under some additional conditions.