Search Results for author: Prasant Mohapatra

Found 20 papers, 5 papers with code

Revisiting Zero-Shot Abstractive Summarization in the Era of Large Language Models from the Perspective of Position Bias

1 code implementation3 Jan 2024 Anshuman Chhabra, Hadi Askari, Prasant Mohapatra

We characterize and study zero-shot abstractive summarization in Large Language Models (LLMs) by measuring position bias, which we propose as a general formulation of the more restrictive lead bias phenomenon studied previously in the literature.

Abstractive Text Summarization Position

Multi-agent Reinforcement Learning: A Comprehensive Survey

no code implementations15 Dec 2023 Dom Huh, Prasant Mohapatra

The prevalence of multi-agent applications pervades various interconnected systems in our everyday lives.

Decision Making Multi-agent Reinforcement Learning +1

Fairness Uncertainty Quantification: How certain are you that the model is fair?

no code implementations27 Apr 2023 Abhishek Roy, Prasant Mohapatra

We provide online multiplier bootstrap method to estimate the asymptotic covariance to construct online CI.

Fairness Uncertainty Quantification

Decentralized Multi-agent Filtering

1 code implementation21 Jan 2023 Dom Huh, Prasant Mohapatra

This paper addresses the considerations that comes along with adopting decentralized communication for multi-agent localization applications in discrete state spaces.

Federated Learning Hyper-Parameter Tuning from a System Perspective

1 code implementation24 Nov 2022 Huanle Zhang, Lei Fu, Mi Zhang, Pengfei Hu, Xiuzhen Cheng, Prasant Mohapatra, Xin Liu

In this paper, we propose FedTune, an automatic FL hyper-parameter tuning algorithm tailored to applications' diverse system requirements in FL training.

Federated Learning

Robust Fair Clustering: A Novel Fairness Attack and Defense Framework

1 code implementation4 Oct 2022 Anshuman Chhabra, Peizhao Li, Prasant Mohapatra, Hongfu Liu

Experimentally, we observe that CFC is highly robust to the proposed attack and is thus a truly robust fair clustering alternative.

Adversarial Attack Clustering +2

On the Robustness of Deep Clustering Models: Adversarial Attacks and Defenses

no code implementations4 Oct 2022 Anshuman Chhabra, Ashwin Sekhari, Prasant Mohapatra

Clustering models constitute a class of unsupervised machine learning methods which are used in a number of application pipelines, and play a vital role in modern data science.

Clustering Deep Clustering +1

Fairness Degrading Adversarial Attacks Against Clustering Algorithms

no code implementations22 Oct 2021 Anshuman Chhabra, Adish Singla, Prasant Mohapatra

As a first step, we propose a fairness degrading attack algorithm for k-median clustering that operates under a whitebox threat model -- where the clustering algorithm, fairness notion, and the input dataset are known to the adversary.

Clustering Fairness

FedTune: Automatic Tuning of Federated Learning Hyper-Parameters from System Perspective

1 code implementation6 Oct 2021 Huanle Zhang, Mi Zhang, Xin Liu, Prasant Mohapatra, Michael DeLucia

Federated learning (FL) hyper-parameters significantly affect the training overheads in terms of computation time, transmission time, computation load, and transmission load.

Federated Learning

Automatic Tuning of Federated Learning Hyper-Parameters from System Perspective

no code implementations29 Sep 2021 Huanle Zhang, Mi Zhang, Xin Liu, Prasant Mohapatra, Michael DeLucia

Federated Learning (FL) is a distributed model training paradigm that preserves clients' data privacy.

Federated Learning

Fair Clustering Using Antidote Data

no code implementations1 Jun 2021 Anshuman Chhabra, Adish Singla, Prasant Mohapatra

Extensive experiments on different clustering algorithms and fairness notions show that our algorithms can achieve desired levels of fairness on many real-world datasets with a very small percentage of antidote data added.

Clustering Fairness

Escaping Saddle-Point Faster under Interpolation-like Conditions

no code implementations NeurIPS 2020 Abhishek Roy, Krishnakumar Balasubramanian, Saeed Ghadimi, Prasant Mohapatra

We next analyze Stochastic Cubic-Regularized Newton (SCRN) algorithm under interpolation-like conditions, and show that the oracle complexity to reach an $\epsilon$-local-minimizer under interpolation-like conditions, is $O(1/\epsilon^{2. 5})$.

Stochastic Optimization

Escaping Saddle-Points Faster under Interpolation-like Conditions

no code implementations28 Sep 2020 Abhishek Roy, Krishnakumar Balasubramanian, Saeed Ghadimi, Prasant Mohapatra

We next analyze Stochastic Cubic-Regularized Newton (SCRN) algorithm under interpolation-like conditions, and show that the oracle complexity to reach an $\epsilon$-local-minimizer under interpolation-like conditions, is $\tilde{\mathcal{O}}(1/\epsilon^{2. 5})$.

Stochastic Optimization

Fair Algorithms for Hierarchical Agglomerative Clustering

no code implementations7 May 2020 Anshuman Chhabra, Prasant Mohapatra

Hierarchical Agglomerative Clustering (HAC) algorithms are extensively utilized in modern data science, and seek to partition the dataset into clusters while generating a hierarchical relationship between the data samples.

Clustering Fairness +1

Suspicion-Free Adversarial Attacks on Clustering Algorithms

no code implementations16 Nov 2019 Anshuman Chhabra, Abhishek Roy, Prasant Mohapatra

To the best of our knowledge, this is the first work that generates spill-over adversarial samples without the knowledge of the true metric ensuring that the perturbed sample is not an outlier, and theoretically proves the above.

Adversarial Attack Clustering

Multi-Point Bandit Algorithms for Nonstationary Online Nonconvex Optimization

no code implementations31 Jul 2019 Abhishek Roy, Krishnakumar Balasubramanian, Saeed Ghadimi, Prasant Mohapatra

In this paper, motivated by online reinforcement learning problems, we propose and analyze bandit algorithms for both general and structured nonconvex problems with nonstationary (or dynamic) regret as the performance measure, in both stochastic and non-stochastic settings.

Strong Black-box Adversarial Attacks on Unsupervised Machine Learning Models

no code implementations28 Jan 2019 Anshuman Chhabra, Abhishek Roy, Prasant Mohapatra

We first provide a strong (iterative) black-box adversarial attack that can craft adversarial samples which will be incorrectly clustered irrespective of the choice of clustering algorithm.

Adversarial Attack BIG-bench Machine Learning +2

When to Reset Your Keys: Optimal Timing of Security Updates via Learning

no code implementations1 Dec 2016 Zizhan Zheng, Ness B. Shroff, Prasant Mohapatra

As these attacks are often designed to disable a system (or a critical resource, e. g., a user account) repeatedly, it is crucial for the defender to keep updating its security measures to strike a balance between the risk of being compromised and the cost of security updates.

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