Search Results for author: Mohammad Mahdian

Found 11 papers, 2 papers with code

Learning across Data Owners with Joint Differential Privacy

no code implementations25 May 2023 Yangsibo Huang, Haotian Jiang, Daogao Liu, Mohammad Mahdian, Jieming Mao, Vahab Mirrokni

In this paper, we study the setting in which data owners train machine learning models collaboratively under a privacy notion called joint differential privacy [Kearns et al., 2018].

Multi-class Classification

Differentially-Private Hierarchical Clustering with Provable Approximation Guarantees

1 code implementation31 Jan 2023 Jacob Imola, Alessandro Epasto, Mohammad Mahdian, Vincent Cohen-Addad, Vahab Mirrokni

Then, we exhibit a polynomial-time approximation algorithm with $O(|V|^{2. 5}/ \epsilon)$-additive error, and an exponential-time algorithm that meets the lower bound.

Clustering Stochastic Block Model

Smoothly Bounding User Contributions in Differential Privacy

no code implementations NeurIPS 2020 Alessandro Epasto, Mohammad Mahdian, Jieming Mao, Vahab Mirrokni, Lijie Ren

But at the same time, more noise might need to be added to the algorithm in order to keep the algorithm differentially private and this might hurt the algorithm’s performance.

Optimal Approximation - Smoothness Tradeoffs for Soft-Max Functions

no code implementations NeurIPS 2020 Alessandro Epasto, Mohammad Mahdian, Vahab Mirrokni, Emmanouil Zampetakis

A soft-max function has two main efficiency measures: (1) approximation - which corresponds to how well it approximates the maximum function, (2) smoothness - which shows how sensitive it is to changes of its input.

Optimal Approximation -- Smoothness Tradeoffs for Soft-Max Functions

no code implementations22 Oct 2020 Alessandro Epasto, Mohammad Mahdian, Vahab Mirrokni, Manolis Zampetakis

A soft-max function has two main efficiency measures: (1) approximation - which corresponds to how well it approximates the maximum function, (2) smoothness - which shows how sensitive it is to changes of its input.

Fair Correlation Clustering

1 code implementation6 Feb 2020 Sara Ahmadian, Alessandro Epasto, Ravi Kumar, Mohammad Mahdian

We define a fairlet decomposition with cost similar to the $k$-median cost and this allows us to obtain approximation algorithms for a wide range of fairness constraints.

Clustering Combinatorial Optimization +1

Clustering without Over-Representation

no code implementations29 May 2019 Sara Ahmadian, Alessandro Epasto, Ravi Kumar, Mohammad Mahdian

In this paper we consider clustering problems in which each point is endowed with a color.

Clustering

Contextual Bandits with Cross-learning

no code implementations NeurIPS 2019 Santiago Balseiro, Negin Golrezaei, Mohammad Mahdian, Vahab Mirrokni, Jon Schneider

We consider the variant of this problem where in addition to receiving the reward $r_{i, t}(c)$, the learner also learns the values of $r_{i, t}(c')$ for some other contexts $c'$ in set $\mathcal{O}_i(c)$; i. e., the rewards that would have been achieved by performing that action under different contexts $c'\in \mathcal{O}_i(c)$.

Multi-Armed Bandits

Community Detection on Evolving Graphs

no code implementations NeurIPS 2016 Aris Anagnostopoulos, Jakub Łącki, Silvio Lattanzi, Stefano Leonardi, Mohammad Mahdian

In many of these applications, the input graph evolves over time in a continual and decentralized manner, and, to maintain a good clustering, the clustering algorithm needs to repeatedly probe the graph.

Clustering Community Detection +3

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