Search Results for author: Dimitrios I. Diochnos

Found 6 papers, 1 papers with code

Meta Co-Training: Two Views are Better than One

1 code implementation29 Nov 2023 Jay C. Rothenberger, Dimitrios I. Diochnos

We show that in the common case when independent views are not available we can construct such views inexpensively using pre-trained models.

Fine-Grained Image Classification Semi-Supervised Image Classification

Lower Bounds for Adversarially Robust PAC Learning

no code implementations13 Jun 2019 Dimitrios I. Diochnos, Saeed Mahloujifar, Mohammad Mahmoody

In this work, we initiate a formal study of probably approximately correct (PAC) learning under evasion attacks, where the adversary's goal is to \emph{misclassify} the adversarially perturbed sample point $\widetilde{x}$, i. e., $h(\widetilde{x})\neq c(\widetilde{x})$, where $c$ is the ground truth concept and $h$ is the learned hypothesis.

PAC learning

Adversarial Risk and Robustness: General Definitions and Implications for the Uniform Distribution

no code implementations NeurIPS 2018 Dimitrios I. Diochnos, Saeed Mahloujifar, Mohammad Mahmoody

We study both "inherent" bounds that apply to any problem and any classifier for such a problem as well as bounds that apply to specific problems and specific hypothesis classes.

The Curse of Concentration in Robust Learning: Evasion and Poisoning Attacks from Concentration of Measure

no code implementations9 Sep 2018 Saeed Mahloujifar, Dimitrios I. Diochnos, Mohammad Mahmoody

We show that if the metric probability space of the test instance is concentrated, any classifier with some initial constant error is inherently vulnerable to adversarial perturbations.

Learning under $p$-Tampering Attacks

no code implementations10 Nov 2017 Saeed Mahloujifar, Dimitrios I. Diochnos, Mohammad Mahmoody

They obtained $p$-tampering attacks that increase the error probability in the so called targeted poisoning model in which the adversary's goal is to increase the loss of the trained hypothesis over a particular test example.

PAC learning

Commonsense Reasoning and Large Network Analysis: A Computational Study of ConceptNet 4

no code implementations22 Apr 2013 Dimitrios I. Diochnos

Part III investigates non-overlapping, as well as overlapping communities that are found in ConceptNet 4.

Clustering

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