1 code implementation • 18 Dec 2021 • Sameer Bibikar, Haris Vikalo, Zhangyang Wang, Xiaohan Chen
Federated learning (FL) enables distribution of machine learning workloads from the cloud to resource-limited edge devices.
1 code implementation • 13 May 2022 • Monica Ribero, Haris Vikalo, Gustavo de Veciana
The proposed algorithm is tested in a variety of settings for intermittently available clients under communication constraints, and its efficacy demonstrated on synthetic data and realistically federated benchmarking experiments using CIFAR100 and Shakespeare datasets.
1 code implementation • 13 Nov 2019 • Ziqi Ke, Haris Vikalo
Reconstructing components of a genomic mixture from data obtained by means of DNA sequencing is a challenging problem encountered in a variety of applications including single individual haplotyping and studies of viral communities.
1 code implementation • 8 Aug 2016 • Abolfazl Hashemi, Haris Vikalo
We analyze the performance of AOLS and establish lower bounds on the probability of exact recovery for both noiseless and noisy random linear measurements.
1 code implementation • 20 Nov 2020 • Abolfazl Hashemi, Anish Acharya, Rudrajit Das, Haris Vikalo, Sujay Sanghavi, Inderjit Dhillon
In this paper, we show that, in such compressed decentralized optimization settings, there are benefits to having {\em multiple} gossip steps between subsequent gradient iterations, even when the cost of doing so is appropriately accounted for e. g. by means of reducing the precision of compressed information.
1 code implementation • 1 Jun 2022 • Huancheng Chen, Haris Vikalo
A major challenge in federated learning arises when the local data is heterogeneous -- the setting in which performance of the learned global model may deteriorate significantly compared to the scenario where the data is identically distributed across the clients.
1 code implementation • NeurIPS 2020 • Ziqi Ke, Haris Vikalo
Haplotype assembly and viral quasispecies reconstruction are challenging tasks concerned with analysis of genomic mixtures using sequencing data.
1 code implementation • 20 Dec 2023 • Yiyue Chen, Haris Vikalo, Chianing Wang
Motivated by high resource costs of centralized machine learning schemes as well as data privacy concerns, federated learning (FL) emerged as an efficient alternative that relies on aggregating locally trained models rather than collecting clients' potentially private data.
no code implementations • 31 Oct 2017 • Abolfazl Hashemi, Rasoul Shafipour, Haris Vikalo, Gonzalo Mateos
We study the problem of sampling a bandlimited graph signal in the presence of noise, where the objective is to select a node subset of prescribed cardinality that minimizes the signal reconstruction mean squared error (MSE).
no code implementations • 31 Oct 2017 • Abolfazl Hashemi, Haris Vikalo
State-of-the-art algorithms for sparse subspace clustering perform spectral clustering on a similarity matrix typically obtained by representing each data point as a sparse combination of other points using either basis pursuit (BP) or orthogonal matching pursuit (OMP).
no code implementations • 8 Aug 2016 • Abolfazl Hashemi, Haris Vikalo
We consider the Orthogonal Least-Squares (OLS) algorithm for the recovery of a $m$-dimensional $k$-sparse signal from a low number of noisy linear measurements.
no code implementations • 22 Feb 2016 • Abolfazl Hashemi, Haris Vikalo
Sparse linear regression, which entails finding a sparse solution to an underdetermined system of linear equations, can formally be expressed as an $l_0$-constrained least-squares problem.
no code implementations • 19 Nov 2014 • Natalia M. Arzeno, Karla A. Lawson, Sarah V. Duzinski, Haris Vikalo
In this paper, we seek to develop risk prediction scores that preserve clinical knowledge embedded in features and structure of the existing additive stepwise scores while addressing limitations caused by variable dichotomization.
no code implementations • 13 Jun 2018 • Somsubhra Barik, Haris Vikalo
In this paper, we consider a binary matrix factorization formulation of the single individual haplotyping problem and efficiently solve it by means of alternating minimization.
no code implementations • 29 Oct 2018 • Abolfazl Hashemi, Haris Vikalo
The problem of organizing data that evolves over time into clusters is encountered in a number of practical settings.
no code implementations • 22 Jul 2019 • Abolfazl Hashemi, Haris Vikalo, Gustavo de Veciana
The latter implies that uniform sampling strategies with a fixed sampling size achieve a non-trivial approximation factor; however, we show that with overwhelming probability, these methods fail to find the optimal subset.
no code implementations • 27 Sep 2019 • Mahsa Ghasemi, Abolfazl Hashemi, Haris Vikalo, Ufuk Topcu
We formulate the task of representation learning as that of mapping the state space of the model to a low-dimensional state space, called the kernel space.
no code implementations • 27 Nov 2019 • Abishek Sankararaman, Haris Vikalo, François Baccelli
Results: We propose a novel graphical representation of sequencing reads and pose the haplotype assembly problem as an instance of community detection on a spatial random graph.
no code implementations • 27 Dec 2019 • Natalia M. Arzeno, Haris Vikalo
We are often interested in clustering objects that evolve over time and identifying solutions to the clustering problem for every time step.
no code implementations • 25 Dec 2019 • Muhammad Usman, Wenxi Wang, Kaiyuan Wang, Marko Vasic, Haris Vikalo, Sarfraz Khurshid
However, MCML metrics based on model counting show that the performance can degrade substantially when tested against the entire (bounded) input space, indicating the high complexity of precisely learning these properties, and the usefulness of model counting in quantifying the true performance.
no code implementations • 1 Mar 2020 • Mónica Ribero, Jette Henderson, Sinead Williamson, Haris Vikalo
However, in domains that demand protection of personally sensitive data, such as medicine or banking, how can we learn such a model without accessing the sensitive data, and without inadvertently leaking private information?
no code implementations • 30 Jul 2020 • Monica Ribero, Haris Vikalo
The central server collects updated local models from only the selected clients and combines them with estimated model updates of the clients that were not selected for communication.
no code implementations • 16 Nov 2020 • Ziqi Ke, Haris Vikalo
Identification of the type of communication technology and/or modulation scheme based on detected radio signal are challenging problems encountered in a variety of applications including spectrum allocation and radio interference mitigation.
no code implementations • 19 Jul 2018 • Abolfazl Hashemi, Rasoul Shafipour, Haris Vikalo, Gonzalo Mateos
Then, we consider the Bayesian scenario where we formulate the sampling task as the problem of maximizing a monotone weak submodular function, and propose a randomized-greedy algorithm to find a sub-optimal subset of informative nodes.
no code implementations • 24 Mar 2021 • Sangsu Lee, Xi Zheng, Jie Hua, Haris Vikalo, Christine Julien
We define a new approach, opportunistic federated learning, in which individual devices belonging to different users seek to learn robust models that are personalized to their user's own experiences.
no code implementations • 27 May 2020 • Yiyue Chen, Abolfazl Hashemi, Haris Vikalo
We propose a communication-efficient algorithm for decentralized convex optimization that rely on sparsification of local updates exchanged between neighboring agents in the network.
no code implementations • 23 Jan 2021 • Yiyue Chen, Abolfazl Hashemi, Haris Vikalo
To our knowledge, this is the first decentralized optimization framework for time-varying directed networks that achieves such a convergence rate and applies to settings requiring sparsified communication.
no code implementations • 8 Mar 2022 • Madhumitha Sakthi, Ahmed Tewfik, Marius Arvinte, Haris Vikalo
We show robust detection based on radar data reconstructed using 20% of samples under extreme weather conditions such as snow or fog, and on low-illuminated nights.
no code implementations • 21 Jan 2023 • Huancheng Chen, Johnny, Wang, Haris Vikalo
In particular, each client extracts and sends to the server the means of local data representations and the corresponding soft predictions -- information that we refer to as ``hyper-knowledge".
no code implementations • 21 Feb 2023 • Madhumitha Sakthi, Ahmed Tewfik, Marius Arvinte, Haris Vikalo
Automotive radar has increasingly attracted attention due to growing interest in autonomous driving technologies.
no code implementations • 28 Aug 2023 • Shorya Consul, John Robertson, Haris Vikalo
It is estimated that approximately 15% of cancers worldwide can be linked to viral infections.
no code implementations • 30 Sep 2023 • Huancheng Chen, Haris Vikalo
Statistical heterogeneity of data present at client devices in a federated learning (FL) system renders the training of a global model in such systems difficult.
no code implementations • 29 Nov 2023 • Huancheng Chen, Haris Vikalo
While federated learning (FL) systems often utilize quantization to battle communication and computational bottlenecks, they have heretofore been limited to deploying fixed-precision quantization schemes.