Search Results for author: Mohammad Mehrabi

Found 8 papers, 1 papers with code

Off-Policy Evaluation in Markov Decision Processes under Weak Distributional Overlap

no code implementations13 Feb 2024 Mohammad Mehrabi, Stefan Wager

In this paper, we re-visit the task of off-policy evaluation in MDPs under a weaker notion of distributional overlap, and introduce a class of truncated doubly robust (TDR) estimators which we find to perform well in this setting.

Off-policy evaluation

A Model-free Closeness-of-influence Test for Features in Supervised Learning

no code implementations20 Jun 2023 Mohammad Mehrabi, Ryan A. Rossi

Ideally, it is desired to understand how a set of collected features combine together and influence the response value, but this problem is notoriously difficult, due to the high-dimensionality of data and limited number of labeled data points, among many others.

Binary Classification

GRASP: A Goodness-of-Fit Test for Classification Learning

no code implementations5 Sep 2022 Adel Javanmard, Mohammad Mehrabi

Performance of classifiers is often measured in terms of average accuracy on test data.

Classification

Adversarial robustness for latent models: Revisiting the robust-standard accuracies tradeoff

1 code implementation22 Oct 2021 Adel Javanmard, Mohammad Mehrabi

We develop a theory to show that the low-dimensional manifold structure allows one to obtain models that are nearly optimal with respect to both, the standard accuracy and the robust accuracy measures.

Adversarial Robustness Binary Classification

Error-Correction for Sparse Support Recovery Algorithms

no code implementations5 Mar 2021 Mohammad Mehrabi, Aslan Tchamkerten

Experimental results with random Gaussian design matrices show that LiRE substantially reduces the number of measurements needed for perfect support recovery via Compressive Sampling Matching Pursuit, Basis Pursuit (BP), and OMP.

Information Theory Information Theory

Fundamental Tradeoffs in Distributionally Adversarial Training

no code implementations15 Jan 2021 Mohammad Mehrabi, Adel Javanmard, Ryan A. Rossi, Anup Rao, Tung Mai

We study the tradeoff between standard risk and adversarial risk and derive the Pareto-optimal tradeoff, achievable over specific classes of models, in the infinite data limit with features dimension kept fixed.

Binary Classification regression

Bounds on the Approximation Power of Feedforward Neural Networks

no code implementations ICML 2018 Mohammad Mehrabi, Aslan Tchamkerten, Mansoor I. Yousefi

The approximation power of general feedforward neural networks with piecewise linear activation functions is investigated.

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