Search Results for author: Konstantinos Stavropoulos

Found 5 papers, 0 papers with code

Learning Intersections of Halfspaces with Distribution Shift: Improved Algorithms and SQ Lower Bounds

no code implementations2 Apr 2024 Adam R. Klivans, Konstantinos Stavropoulos, Arsen Vasilyan

Recent work of Klivans, Stavropoulos, and Vasilyan initiated the study of testable learning with distribution shift (TDS learning), where a learner is given labeled samples from training distribution $\mathcal{D}$, unlabeled samples from test distribution $\mathcal{D}'$, and the goal is to output a classifier with low error on $\mathcal{D}'$ whenever the training samples pass a corresponding test.

Dimensionality Reduction Domain Adaptation

Testable Learning with Distribution Shift

no code implementations25 Nov 2023 Adam R. Klivans, Konstantinos Stavropoulos, Arsen Vasilyan

In this model, a learner outputs a classifier with low test error whenever samples from $D$ and $D'$ pass an associated test; moreover, the test must accept if the marginal of $D$ equals the marginal of $D'$.

Active Learning

An Efficient Tester-Learner for Halfspaces

no code implementations28 Feb 2023 Aravind Gollakota, Adam R. Klivans, Konstantinos Stavropoulos, Arsen Vasilyan

Prior work on testable learning ignores the labels in the training set and checks that the empirical moments of the covariates are close to the moments of the base distribution.

Learning and Covering Sums of Independent Random Variables with Unbounded Support

no code implementations24 Oct 2022 Alkis Kalavasis, Konstantinos Stavropoulos, Manolis Zampetakis

In this work, we address two questions: (i) Are there general families of SIIRVs with unbounded support that can be learned with sample complexity independent of both $n$ and the maximal element of the support?

Aggregating Incomplete and Noisy Rankings

no code implementations2 Nov 2020 Dimitris Fotakis, Alkis Kalavasis, Konstantinos Stavropoulos

We consider the problem of learning the true ordering of a set of alternatives from largely incomplete and noisy rankings.

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