A unified analysis of subspace perturbations in zero-order optimization identifies subspace alignment as the key driver of convergence, and leads to MeZO-BCD, a block-coordinate method with up to 2.77x wall-clock speedup over MeZO.
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Elucidating Subspace Perturbation in Zeroth-Order Optimization: Theory and Practice at Scale
A unified analysis of subspace perturbations in zero-order optimization identifies subspace alignment as the key driver of convergence, and leads to MeZO-BCD, a block-coordinate method with up to 2.77x wall-clock speedup over MeZO.