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Sketching Algorithms and Lower Bounds for Ridge Regression

ICML 2022 · Learning theory and algorithms › Matrix and tensor methods · approach: Randomized sketching for matrices · 0 citations (OpenAlex)

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Measured effects reported in the paper

What was changedWhereMeasuredEffect
Replace an error-dependent subspace embedding with a constant subspace embedding plus an AMM guaranteeOne-iteration ridge regression sketching with OSNAP · Ridge regressionOSNAP sparsity: O(\sqrt{\sigma^2/\lambda\varepsilon} \cdot \log(n)) -> O(\log(n))Helped
Replace an error-dependent subspace embedding with a constant subspace embedding plus an AMM guaranteeOne-iteration ridge regression sketching · Ridge regressiontotal running time: O(\nnz(A)\operatorname{poly}(\log(n))/\sqrt{\varepsilon} + n^{\omega}\operatorname{poly}(\log(n))/\varepsilon) -> O(\nnzHelped
Increase the number of iterative refinement steps from one to t (ablation)Proposed iterative sketching algorithm · Ridge regressionsolution relative error: \varepsilon\opnorm{x^*} -> (\sqrt{\varepsilon})^t\opnorm{x^*}Helped
Use fresh sketching matrices at each iterationProposed iterative sketching algorithm · Ridge regressionsolution relative error: (\sqrt{\varepsilon})^t\opnorm{x^*}Helped
Use OSNAP with any sparsity parameter while meeting the AMM guaranteeOSNAP sketch for ridge regression · Ridge regressionAMM guarantee: m = \Omega(1/\varepsilon^2\delta)Helped

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