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stat.ML updates on arXiv.org

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HOUDINI: Escaping from Moderately Constrained Saddles
Dmitrii Avdiukhin, Grigory Yaroslavtsev · 2022-05-27 · via stat.ML updates on arXiv.org

We give the first polynomial time algorithms for escaping from high-dimensional saddle points under a moderate number of constraints. Given gradient access to a smooth function $f \colon \mathbb R^d \to \mathbb R$ we show that (noisy) gradient descent methods can escape from saddle points under a logarithmic number of inequality constraints. This constitutes the first tangible progress (without reliance on NP-oracles or altering the definitions to only account for certain constraints) on the main open question of the breakthrough work of Ge et al. who showed an analogous result for unconstrained and equality-constrained problems. Our results hold for both regular and stochastic gradient descent.