Scaled Gradients on Grassmann Manifolds for Matrix Completion

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A literature survey of low‐rank tensor approximation techniques (2013, neutral): “Examples include nonlinear conjugate gradient or Newton-like methods on manifolds of low-rank matrices [35,191,198,257,258] or low-rank tensors [52,53,131,132,255], see also Section 3.4.”
Low-rank tensor completion by Riemannian optimization (2014, background): “A similar approach has been considered in [19, 21, 30] for the matrix case, where it was shown to be competitive to other state-ofthe-art approaches to matrix completion.”