Search Results for author: Girish N. Nair

Found 8 papers, 0 papers with code

Entropy-Regularized Partially Observed Markov Decision Processes

no code implementations22 Dec 2021 Timothy L. Molloy, Girish N. Nair

We investigate partially observed Markov decision processes (POMDPs) with cost functions regularized by entropy terms describing state, observation, and control uncertainty.

Smoother Entropy for Active State Trajectory Estimation and Obfuscation in POMDPs

no code implementations19 Aug 2021 Timothy L. Molloy, Girish N. Nair

We study the problem of controlling a partially observed Markov decision process (POMDP) to either aid or hinder the estimation of its state trajectory.

Granger Causality from Quantized Measurements

no code implementations3 Jun 2021 Salman Ahmadi, Girish N. Nair, Erik Weyer

Then, conditions are derived under which Granger causality between jointly Gaussian processes can be reliably inferred from the second order moments of quantized measurements.

Gaussian Processes Quantization

Active Trajectory Estimation for Partially Observed Markov Decision Processes via Conditional Entropy

no code implementations4 Apr 2021 Timothy L. Molloy, Girish N. Nair

By establishing a novel form of the smoother entropy in terms of the POMDP belief (or information) state, we show that our active smoothing problem can be reformulated as a (fully observed) Markov decision process with a value function that is concave in the belief state.

Smoothing-Averse Control: Covertness and Privacy from Smoothers

no code implementations23 Mar 2021 Timothy L. Molloy, Girish N. Nair

In this paper we investigate the problem of controlling a partially observed stochastic dynamical system such that its state is difficult to infer using a (fixed-interval) Bayesian smoother.

Intelligent Reference Curation for Visual Place Recognition via Bayesian Selective Fusion

no code implementations19 Oct 2020 Timothy L. Molloy, Tobias Fischer, Michael Milford, Girish N. Nair

A key challenge in visual place recognition (VPR) is recognizing places despite drastic visual appearance changes due to factors such as time of day, season, weather or lighting conditions.

Visual Place Recognition

Bounded State Estimation over Finite-State Channels: Relating Topological Entropy and Zero-Error Capacity

no code implementations24 Mar 2020 Amir Saberi, Farhad Farokhi, Girish N. Nair

We investigate state estimation of linear systems over channels having a finite state not known by the transmitter or receiver.

Uniformly Bounded State Estimation over Multiple Access Channels

no code implementations9 Feb 2020 Ghassen Zafzouf, Girish N. Nair, Farhad Farokhi

This paper addresses the problem of distributed state estimation via multiple access channels (MACs).

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