Search Results for author: Stratis Ioannidis

Found 36 papers, 12 papers with code

Fair Concurrent Training of Multiple Models in Federated Learning

no code implementations22 Apr 2024 Marie Siew, Haoran Zhang, Jong-Ik Park, Yuezhou Liu, Yichen Ruan, Lili Su, Stratis Ioannidis, Edmund Yeh, Carlee Joe-Wong

We show how our fairness-based learning and incentive mechanisms impact training convergence and finally evaluate our algorithm with multiple sets of learning tasks on real world datasets.

Fairness Federated Learning

Empowering Federated Learning with Implicit Gossiping: Mitigating Connection Unreliability Amidst Unknown and Arbitrary Dynamics

no code implementations15 Apr 2024 Ming Xiang, Stratis Ioannidis, Edmund Yeh, Carlee Joe-Wong, Lili Su

It consists of a parameter server and a possibly large collection of clients (e. g., in cross-device federated learning) that may operate in congested and changing environments.

Federated Learning

T-PRIME: Transformer-based Protocol Identification for Machine-learning at the Edge

1 code implementation9 Jan 2024 Mauro Belgiovine, Joshua Groen, Miquel Sirera, Chinenye Tassie, Ayberk Yarkin Yildiz, Sage Trudeau, Stratis Ioannidis, Kaushik Chowdhury

Spectrum sharing allows different protocols of the same standard (e. g., 802. 11 family) or different standards (e. g., LTE and DVB) to coexist in overlapping frequency bands.

Online Submodular Maximization via Online Convex Optimization

1 code implementation8 Sep 2023 Tareq Si Salem, Gözde Özcan, Iasonas Nikolaou, Evimaria Terzi, Stratis Ioannidis

We study monotone submodular maximization under general matroid constraints in the online setting.

Towards Bias Correction of FedAvg over Nonuniform and Time-Varying Communications

no code implementations1 Jun 2023 Ming Xiang, Stratis Ioannidis, Edmund Yeh, Carlee Joe-Wong, Lili Su

Specifically, in each round $t$, the link between the PS and client $i$ is active with probability $p_i^t$, which is $\textit{unknown}$ to both the PS and the clients.

Federated Learning

Multiverse at the Edge: Interacting Real World and Digital Twins for Wireless Beamforming

no code implementations10 May 2023 Batool Salehi, Utku Demir, Debashri Roy, Suyash Pradhan, Jennifer Dy, Stratis Ioannidis, Kaushik Chowdhury

To achieve this, we go beyond instantiating a single twin and propose the 'Multiverse' paradigm, with several possible digital twins attempting to capture the real world at different levels of fidelity.

Decision Making Self-Learning

Explanations of Black-Box Models based on Directional Feature Interactions

1 code implementation ICLR 2022 Aria Masoomi, Davin Hill, Zhonghui Xu, Craig P Hersh, Edwin K. Silverman, Peter J. Castaldi, Stratis Ioannidis, Jennifer Dy

As machine learning algorithms are deployed ubiquitously to a variety of domains, it is imperative to make these often black-box models transparent.

Stochastic Submodular Maximization via Polynomial Estimators

no code implementations17 Mar 2023 Gözde Özcan, Stratis Ioannidis

In this paper, we study stochastic submodular maximization problems with general matroid constraints, that naturally arise in online learning, team formation, facility location, influence maximization, active learning and sensing objective functions.

Active Learning

SparCL: Sparse Continual Learning on the Edge

1 code implementation20 Sep 2022 Zifeng Wang, Zheng Zhan, Yifan Gong, Geng Yuan, Wei Niu, Tong Jian, Bin Ren, Stratis Ioannidis, Yanzhi Wang, Jennifer Dy

SparCL achieves both training acceleration and accuracy preservation through the synergy of three aspects: weight sparsity, data efficiency, and gradient sparsity.

Continual Learning

Differentially Private Regression with Unbounded Covariates

no code implementations19 Feb 2022 Jason Milionis, Alkis Kalavasis, Dimitris Fotakis, Stratis Ioannidis

We provide computationally efficient, differentially private algorithms for the classical regression settings of Least Squares Fitting, Binary Regression and Linear Regression with unbounded covariates.

regression

AirNN: Neural Networks with Over-the-Air Convolution via Reconfigurable Intelligent Surfaces

no code implementations7 Feb 2022 Sara Garcia Sanchez, Guillem Reus Muns, Carlos Bocanegra, Yanyu Li, Ufuk Muncuk, Yousof Naderi, Yanzhi Wang, Stratis Ioannidis, Kaushik R. Chowdhury

In this paper, we design and implement the first-of-its-kind over-the-air convolution and demonstrate it for inference tasks in a convolutional neural network (CNN).

Deep Learning on Multimodal Sensor Data at the Wireless Edge for Vehicular Network

1 code implementation12 Jan 2022 Batool Salehi, Guillem Reus-Muns, Debashri Roy, Zifeng Wang, Tong Jian, Jennifer Dy, Stratis Ioannidis, Kaushik Chowdhury

Beam selection for millimeter-wave links in a vehicular scenario is a challenging problem, as an exhaustive search among all candidate beam pairs cannot be assuredly completed within short contact times.

Edge-computing

Robust Regression via Model Based Methods

no code implementations20 Jun 2021 Armin Moharrer, Khashayar Kamran, Edmund Yeh, Stratis Ioannidis

The mean squared error loss is widely used in many applications, including auto-encoders, multi-target regression, and matrix factorization, to name a few.

Multi-target regression regression

Revisiting Hilbert-Schmidt Information Bottleneck for Adversarial Robustness

1 code implementation NeurIPS 2021 Zifeng Wang, Tong Jian, Aria Masoomi, Stratis Ioannidis, Jennifer Dy

We investigate the HSIC (Hilbert-Schmidt independence criterion) bottleneck as a regularizer for learning an adversarially robust deep neural network classifier.

Adversarial Robustness

On the Sample Complexity of Rank Regression from Pairwise Comparisons

no code implementations4 May 2021 Berkan Kadioglu, Peng Tian, Jennifer Dy, Deniz Erdogmus, Stratis Ioannidis

We consider a rank regression setting, in which a dataset of $N$ samples with features in $\mathbb{R}^d$ is ranked by an oracle via $M$ pairwise comparisons.

regression

Machine Learning on Camera Images for Fast mmWave Beamforming

no code implementations15 Feb 2021 Batool Salehi, Mauro Belgiovine, Sara Garcia Sanchez, Jennifer Dy, Stratis Ioannidis, Kaushik Chowdhury

Perfect alignment in chosen beam sectors at both transmit- and receive-nodes is required for beamforming in mmWave bands.

BIG-bench Machine Learning

Submodular Maximization via Taylor Series Approximation

1 code implementation19 Jan 2021 Gözde Özcan, Armin Moharrer, Stratis Ioannidis

We study submodular maximization problems with matroid constraints, in particular, problems where the objective can be expressed via compositions of analytic and multilinear functions.

Rate Allocation and Content Placement in Cache Networks

no code implementations9 Jan 2021 Khashayar Kamran, Armin Moharrer, Stratis Ioannidis, Edmund Yeh

We introduce the problem of optimal congestion control in cache networks, whereby \emph{both} rate allocations and content placements are optimized \emph{jointly}.

Networking and Internet Architecture

Open-World Class Discovery with Kernel Networks

1 code implementation13 Dec 2020 Zifeng Wang, Batool Salehi, Andrey Gritsenko, Kaushik Chowdhury, Stratis Ioannidis, Jennifer Dy

We study an Open-World Class Discovery problem in which, given labeled training samples from old classes, we need to discover new classes from unlabeled test samples.

Learn-Prune-Share for Lifelong Learning

1 code implementation13 Dec 2020 Zifeng Wang, Tong Jian, Kaushik Chowdhury, Yanzhi Wang, Jennifer Dy, Stratis Ioannidis

In lifelong learning, we wish to maintain and update a model (e. g., a neural network classifier) in the presence of new classification tasks that arrive sequentially.

Bandits Under The Influence (Extended Version)

no code implementations21 Sep 2020 Silviu Maniu, Stratis Ioannidis, Bogdan Cautis

Our bandit algorithms are tailored precisely to recommendation scenarios where user interests evolve under social influence.

Recommendation Systems Thompson Sampling

Iterative Spectral Method for Alternative Clustering

no code implementations8 Sep 2019 Chieh Wu, Stratis Ioannidis, Mario Sznaier, Xiangyu Li, David Kaeli, Jennifer G. Dy

Given a dataset and an existing clustering as input, alternative clustering aims to find an alternative partition.

Clustering

Deep Kernel Learning for Clustering

no code implementations9 Aug 2019 Chieh Wu, Zulqarnain Khan, Yale Chang, Stratis Ioannidis, Jennifer Dy

We propose a deep learning approach for discovering kernels tailored to identifying clusters over sample data.

Clustering Deep Clustering

Accelerated Experimental Design for Pairwise Comparisons

1 code implementation18 Jan 2019 Yuan Guo, Jennifer Dy, Deniz Erdogmus, Jayashree Kalpathy-Cramer, Susan Ostmo, J. Peter Campbell, Michael F. Chiang, Stratis Ioannidis

Pairwise comparison labels are more informative and less variable than class labels, but generating them poses a challenge: their number grows quadratically in the dataset size.

2k Experimental Design

ORACLE: Optimized Radio clAssification through Convolutional neuraL nEtworks

no code implementations3 Dec 2018 Kunal Sankhe, Mauro Belgiovine, Fan Zhou, Shamnaz Riyaz, Stratis Ioannidis, Kaushik Chowdhury

This paper describes the architecture and performance of ORACLE, an approach for detecting a unique radio from a large pool of bit-similar devices (same hardware, protocol, physical address, MAC ID) using only IQ samples at the physical layer.

Classification General Classification

Learning Combinations of Sigmoids Through Gradient Estimation

no code implementations22 Aug 2017 Stratis Ioannidis, Andrea Montanari

In a nutshell, we estimate the gradient of the regression function at a set of random points, and cluster the estimated gradients.

regression

Truthful Linear Regression

no code implementations10 Jun 2015 Rachel Cummings, Stratis Ioannidis, Katrina Ligett

We consider the problem of fitting a linear model to data held by individuals who are concerned about their privacy.

regression

Privacy Tradeoffs in Predictive Analytics

no code implementations31 Mar 2014 Stratis Ioannidis, Andrea Montanari, Udi Weinsberg, Smriti Bhagat, Nadia Fawaz, Nina Taft

Recent research has demonstrated that several private user attributes (such as political affiliation, sexual orientation, and gender) can be inferred from such data.

Attribute Privacy Preserving

Recommending with an Agenda: Active Learning of Private Attributes using Matrix Factorization

no code implementations26 Nov 2013 Smriti Bhagat, Udi Weinsberg, Stratis Ioannidis, Nina Taft

Recommender systems leverage user demographic information, such as age, gender, etc., to personalize recommendations and better place their targeted ads.

Active Learning Recommendation Systems

Learning Mixtures of Linear Classifiers

no code implementations11 Nov 2013 Yuekai Sun, Stratis Ioannidis, Andrea Montanari

We consider a discriminative learning (regression) problem, whereby the regression function is a convex combination of k linear classifiers.

regression

Linear Regression from Strategic Data Sources

1 code implementation30 Sep 2013 Nicolas Gast, Stratis Ioannidis, Patrick Loiseau, Benjamin Roussillon

In this paper, we study a setting in which features are public but individuals choose the precision of the outputs they reveal to an analyst.

regression

From Small-World Networks to Comparison-Based Search

no code implementations15 Jul 2011 Amin Karbasi, Stratis Ioannidis, Laurent Massoulie

In short, a user searching for a target object navigates through a database in the following manner: the user is asked to select the object most similar to her target from a small list of objects.

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