Search Results for author: Farshad Khorrami

Found 24 papers, 5 papers with code

Confidence-Aware Safe and Stable Control of Control-Affine Systems

no code implementations14 Mar 2024 Shiqing Wei, Prashanth Krishnamurthy, Farshad Khorrami

Designing control inputs that satisfy safety requirements is crucial in safety-critical nonlinear control, and this task becomes particularly challenging when full-state measurements are unavailable.

On the (In)feasibility of ML Backdoor Detection as an Hypothesis Testing Problem

1 code implementation26 Feb 2024 Georg Pichler, Marco Romanelli, Divya Prakash Manivannan, Prashanth Krishnamurthy, Farshad Khorrami, Siddharth Garg

We introduce a formal statistical definition for the problem of backdoor detection in machine learning systems and use it to analyze the feasibility of such problems, providing evidence for the utility and applicability of our definition.

Automated Theorem Proving Out-of-Distribution Detection

Novel Quadratic Constraints for Extending LipSDP beyond Slope-Restricted Activations

no code implementations25 Jan 2024 Patricia Pauli, Aaron Havens, Alexandre Araujo, Siddharth Garg, Farshad Khorrami, Frank Allgöwer, Bin Hu

However, a direct application of LipSDP to the resultant residual ReLU networks is conservative and even fails in recovering the well-known fact that the MaxMin activation is 1-Lipschitz.

LipSim: A Provably Robust Perceptual Similarity Metric

1 code implementation27 Oct 2023 Sara Ghazanfari, Alexandre Araujo, Prashanth Krishnamurthy, Farshad Khorrami, Siddharth Garg

On the other hand, as perceptual metrics rely on neural networks, there is a growing concern regarding their resilience, given the established vulnerability of neural networks to adversarial attacks.

Image Retrieval Retrieval

High-Dimensional Controller Tuning through Latent Representations

no code implementations21 Sep 2023 Alireza Sarmadi, Prashanth Krishnamurthy, Farshad Khorrami

We show the efficacy of the algorithm in tuning the high-dimensional controller parameters and also reducing the number of evaluations required for the tuning.

Bayesian Optimization

R-LPIPS: An Adversarially Robust Perceptual Similarity Metric

1 code implementation27 Jul 2023 Sara Ghazanfari, Siddharth Garg, Prashanth Krishnamurthy, Farshad Khorrami, Alexandre Araujo

In this paper, we propose the Robust Learned Perceptual Image Patch Similarity (R-LPIPS) metric, a new metric that leverages adversarially trained deep features.

Using Circulation to Mitigate Spurious Equilibria in Control Barrier Function -- Extended Version

no code implementations19 Jul 2023 Vinicius Mariano Goncalves, Prashanth Krishnamurthy, Anthony Tzes, Farshad Khorrami

Control Barrier Functions and Quadratic Programming are increasingly used for designing controllers that consider critical safety constraints.

Differential Analysis of Triggers and Benign Features for Black-Box DNN Backdoor Detection

1 code implementation11 Jul 2023 Hao Fu, Prashanth Krishnamurthy, Siddharth Garg, Farshad Khorrami

Having the computed five metrics, five novelty detectors are trained from the validation dataset.

Towards Better Certified Segmentation via Diffusion Models

no code implementations16 Jun 2023 Othmane Laousy, Alexandre Araujo, Guillaume Chassagnon, Marie-Pierre Revel, Siddharth Garg, Farshad Khorrami, Maria Vakalopoulou

The robustness of image segmentation has been an important research topic in the past few years as segmentation models have reached production-level accuracy.

Autonomous Driving Image Segmentation +2

State Constrained Stochastic Optimal Control for Continuous and Hybrid Dynamical Systems Using DFBSDE

no code implementations11 May 2023 Bolun Dai, Prashanth Krishnamurthy, Andrew Papanicolaou, Farshad Khorrami

We develop a computationally efficient learning-based forward-backward stochastic differential equations (FBSDE) controller for both continuous and hybrid dynamical (HD) systems subject to stochastic noise and state constraints.

Neural Lyapunov Control for Nonlinear Systems with Unstructured Uncertainties

no code implementations16 Mar 2023 Shiqing Wei, Prashanth Krishnamurthy, Farshad Khorrami

Based on a regularity condition on these uncertainties, we model them as bounded disturbances and prove that a CLF for the nominal system (estimate of the true system) is an input-to-state stable control Lyapunov function (ISS-CLF) for the true system when the CLF's gradient is bounded.

Data-Driven Deep Learning Based Feedback Linearization of Systems with Unknown Dynamics

no code implementations15 Mar 2023 Raktim Gautam Goswami, Prashanth Krishnamurthy, Farshad Khorrami

A methodology is developed to learn a feedback linearization (i. e., nonlinear change of coordinates and input transformation) using a data-driven approach for a single input control-affine nonlinear system with unknown dynamics.

Data-Efficient Control Barrier Function Refinement

no code implementations10 Mar 2023 Bolun Dai, Heming Huang, Prashanth Krishnamurthy, Farshad Khorrami

Then, a probability distribution based on the priority score of the data points is used to sample data and update the learned CBF.

valid

Privacy-Preserving Collaborative Learning through Feature Extraction

no code implementations13 Dec 2022 Alireza Sarmadi, Hao Fu, Prashanth Krishnamurthy, Siddharth Garg, Farshad Khorrami

As a baseline, in Cooperatively Trained Feature Extractor (CTFE) Learning, the entities train models by sharing raw data.

Fraud Detection Inference Attack +2

Learning a Better Control Barrier Function

no code implementations11 May 2022 Bolun Dai, Prashanth Krishnamurthy, Farshad Khorrami

With our proposed approach, we can generate safe controllers that are less conservative and computationally more efficient.

valid

Pop Quiz! Can a Large Language Model Help With Reverse Engineering?

no code implementations2 Feb 2022 Hammond Pearce, Benjamin Tan, Prashanth Krishnamurthy, Farshad Khorrami, Ramesh Karri, Brendan Dolan-Gavitt

Large language models (such as OpenAI's Codex) have demonstrated impressive zero-shot multi-task capabilities in the software domain, including code explanation.

Language Modelling Large Language Model

State Constrained Stochastic Optimal Control Using LSTMs

no code implementations5 Apr 2021 Bolun Dai, Prashanth Krishnamurthy, Andrew Papanicolaou, Farshad Khorrami

In this paper, we propose a new methodology for state constrained stochastic optimal control (SOC) problems.

Bait and Switch: Online Training Data Poisoning of Autonomous Driving Systems

no code implementations8 Nov 2020 Naman Patel, Prashanth Krishnamurthy, Siddharth Garg, Farshad Khorrami

We show that by controlling parts of a physical environment in which a pre-trained deep neural network (DNN) is being fine-tuned online, an adversary can launch subtle data poisoning attacks that degrade the performance of the system.

Autonomous Driving Data Poisoning

Detecting Backdoors in Neural Networks Using Novel Feature-Based Anomaly Detection

no code implementations4 Nov 2020 Hao Fu, Akshaj Kumar Veldanda, Prashanth Krishnamurthy, Siddharth Garg, Farshad Khorrami

This paper proposes a new defense against neural network backdooring attacks that are maliciously trained to mispredict in the presence of attacker-chosen triggers.

Anomaly Detection Data Augmentation

Hardware Trojan Detection Using Controlled Circuit Aging

no code implementations6 Apr 2020 Virinchi Roy Surabhi, Prashanth Krishnamurthy, Hussam Amrouch, Kanad Basu, Jörg Henkel, Ramesh Karri, Farshad Khorrami

Combining IC aging with over-clocking produces a pattern of bit errors at the IC output by the induced timing violations.

NNoculation: Catching BadNets in the Wild

1 code implementation19 Feb 2020 Akshaj Kumar Veldanda, Kang Liu, Benjamin Tan, Prashanth Krishnamurthy, Farshad Khorrami, Ramesh Karri, Brendan Dolan-Gavitt, Siddharth Garg

This paper proposes a novel two-stage defense (NNoculation) against backdoored neural networks (BadNets) that, repairs a BadNet both pre-deployment and online in response to backdoored test inputs encountered in the field.

Adversarial Learning-Based On-Line Anomaly Monitoring for Assured Autonomy

no code implementations12 Nov 2018 Naman Patel, Apoorva Nandini Saridena, Anna Choromanska, Prashanth Krishnamurthy, Farshad Khorrami

The paper proposes an on-line monitoring framework for continuous real-time safety/security in learning-based control systems (specifically application to a unmanned ground vehicle).

Anomaly Detection Generative Adversarial Network +1

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