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Leveraging Continuous Time to Understand Momentum When Training Diagonal Linear Networks
March 11, 2024, 4:41 a.m. | Hristo Papazov, Scott Pesme, Nicolas Flammarion
cs.LG updates on arXiv.org arxiv.org
Abstract: In this work, we investigate the effect of momentum on the optimisation trajectory of gradient descent. We leverage a continuous-time approach in the analysis of momentum gradient descent with step size $\gamma$ and momentum parameter $\beta$ that allows us to identify an intrinsic quantity $\lambda = \frac{ \gamma }{ (1 - \beta)^2 }$ which uniquely defines the optimisation path and provides a simple acceleration rule. When training a $2$-layer diagonal linear network in an overparametrised …
abstract analysis arxiv beta continuous cs.lg gradient identify intrinsic linear math.oc networks optimisation stat.ml training trajectory type work
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