Search Results for author: Ashkan Norouzi-Fard

Found 14 papers, 2 papers with code

Fairness in Submodular Maximization over a Matroid Constraint

no code implementations21 Dec 2023 Marwa El Halabi, Jakub Tarnawski, Ashkan Norouzi-Fard, Thuy-Duong Vuong

Submodular maximization over a matroid constraint is a fundamental problem with various applications in machine learning.

Attribute Decision Making +1

Fully Dynamic Submodular Maximization over Matroids

no code implementations31 May 2023 Paul Dütting, Federico Fusco, Silvio Lattanzi, Ashkan Norouzi-Fard, Morteza Zadimoghaddam

Maximizing monotone submodular functions under a matroid constraint is a classic algorithmic problem with multiple applications in data mining and machine learning.

Fairness in Streaming Submodular Maximization over a Matroid Constraint

1 code implementation24 May 2023 Marwa El Halabi, Federico Fusco, Ashkan Norouzi-Fard, Jakab Tardos, Jakub Tarnawski

Streaming submodular maximization is a natural model for the task of selecting a representative subset from a large-scale dataset.

Clustering Fairness +1

Deletion Robust Non-Monotone Submodular Maximization over Matroids

no code implementations16 Aug 2022 Paul Dütting, Federico Fusco, Silvio Lattanzi, Ashkan Norouzi-Fard, Morteza Zadimoghaddam

Maximizing a submodular function is a fundamental task in machine learning and in this paper we study the deletion robust version of the problem under the classic matroids constraint.

Near-Optimal Correlation Clustering with Privacy

no code implementations2 Mar 2022 Vincent Cohen-Addad, Chenglin Fan, Silvio Lattanzi, Slobodan Mitrović, Ashkan Norouzi-Fard, Nikos Parotsidis, Jakub Tarnawski

Correlation clustering is a central problem in unsupervised learning, with applications spanning community detection, duplicate detection, automated labelling and many more.

Clustering Community Detection

Parallel and Efficient Hierarchical k-Median Clustering

no code implementations NeurIPS 2021 Vincent Cohen-Addad, Silvio Lattanzi, Ashkan Norouzi-Fard, Christian Sohler, Ola Svensson

In this paper we introduce a new parallel algorithm for the Euclidean hierarchical $k$-median problem that, when using machines with memory $s$ (for $s\in \Omega(\log^2 (n+\Delta+d))$), outputs a hierarchical clustering such that for every fixed value of $k$ the cost of the solution is at most an $O(\min\{d, \log n\} \log \Delta)$ factor larger in expectation than that of an optimal solution.

Clustering

Correlation Clustering in Constant Many Parallel Rounds

no code implementations15 Jun 2021 Vincent Cohen-Addad, Silvio Lattanzi, Slobodan Mitrović, Ashkan Norouzi-Fard, Nikos Parotsidis, Jakub Tarnawski

Correlation clustering is a central topic in unsupervised learning, with many applications in ML and data mining.

Clustering

Fast and Accurate $k$-means++ via Rejection Sampling

no code implementations NeurIPS 2020 Vincent Cohen-Addad, Silvio Lattanzi, Ashkan Norouzi-Fard, Christian Sohler, Ola Svensson

$k$-means++ \cite{arthur2007k} is a widely used clustering algorithm that is easy to implement, has nice theoretical guarantees and strong empirical performance.

Clustering

Fairness in Streaming Submodular Maximization: Algorithms and Hardness

1 code implementation NeurIPS 2020 Marwa El Halabi, Slobodan Mitrović, Ashkan Norouzi-Fard, Jakab Tardos, Jakub Tarnawski

Submodular maximization has become established as the method of choice for the task of selecting representative and diverse summaries of data.

BIG-bench Machine Learning Clustering +2

Beyond $1/2$-Approximation for Submodular Maximization on Massive Data Streams

no code implementations6 Aug 2018 Ashkan Norouzi-Fard, Jakub Tarnawski, Slobodan Mitrović, Amir Zandieh, Aida Mousavifar, Ola Svensson

It is the first low-memory, single-pass algorithm that improves the factor $0. 5$, under the natural assumption that elements arrive in a random order.

Clustering Recommendation Systems

Streaming Robust Submodular Maximization: A Partitioned Thresholding Approach

no code implementations NeurIPS 2017 Slobodan Mitrović, Ilija Bogunovic, Ashkan Norouzi-Fard, Jakub Tarnawski, Volkan Cevher

We study the classical problem of maximizing a monotone submodular function subject to a cardinality constraint k, with two additional twists: (i) elements arrive in a streaming fashion, and (ii) m items from the algorithm's memory are removed after the stream is finished.

Data Summarization

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