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From the Greene--Wu Convolution to Gradient Estimation over Riemannian Manifolds

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arxiv 2108.07406 v4 pith:DO5HVVT6 submitted 2021-08-17 cs.LG cs.NAmath.NAmath.OC

classification cs.LGcs.NAmath.NAmath.OC
keywords convolutionriemanniancurvatureestimationgradientintroducedmanifoldsaffect
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Over a complete Riemannian manifold of finite dimension, Greene and Wu introduced a convolution, known as Greene-Wu (GW) convolution. In this paper, we study properties of the GW convolution and apply it to non-Euclidean machine learning problems. In particular, we derive a new formula for how the curvature of the space would affect the curvature of the function through the GW convolution. Also, following the study of the GW convolution, a new method for gradient estimation over Riemannian manifolds is introduced.

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  1. Federated Learning on Riemannian Manifolds: A Gradient-Free Projection-Based Approach

    math.OC 2025-07 conditional novelty 6.0 of 10

    A projection-based zeroth-order federated learning algorithm on Riemannian manifolds achieves sublinear convergence with linear speedup, using only Euclidean random perturbations.

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