Search Results for author: Kimon Fountoulakis

Found 17 papers, 6 papers with code

p-Norm Flow Diffusion for Local Graph Clustering

1 code implementation ICML 2020 Kimon Fountoulakis, Di Wang, Shenghao Yang

Local graph clustering and the closely related seed set expansion problem are primitives on graphs that are central to a wide range of analytic and learning tasks such as local clustering, community detection, nodes ranking and feature inference.

Clustering Community Detection +1

Simulation of Graph Algorithms with Looped Transformers

no code implementations2 Feb 2024 Artur Back de Luca, Kimon Fountoulakis

The architecture that we utilize is a looped transformer with extra attention heads that interact with the graph.

Local Graph Clustering with Noisy Labels

no code implementations12 Oct 2023 Artur Back de Luca, Kimon Fountoulakis, Shenghao Yang

We provide sufficient conditions on the label noise under which, with high probability, using diffusion in the weighted graph yields a more accurate recovery of the target cluster.

Clustering Graph Clustering

Optimality of Message-Passing Architectures for Sparse Graphs

no code implementations NeurIPS 2023 Aseem Baranwal, Kimon Fountoulakis, Aukosh Jagannath

We study the node classification problem on feature-decorated graphs in the sparse setting, i. e., when the expected degree of a node is $O(1)$ in the number of nodes, in the fixed-dimensional asymptotic regime, i. e., the dimension of the feature data is fixed while the number of nodes is large.

Node Classification

On Classification Thresholds for Graph Attention with Edge Features

no code implementations18 Oct 2022 Kimon Fountoulakis, Dake He, Silvio Lattanzi, Bryan Perozzi, Anton Tsitsulin, Shenghao Yang

In CSBM the nodes and edge features are obtained from a mixture of Gaussians and the edges from a stochastic block model.

Classification Graph Attention +2

Effects of Graph Convolutions in Multi-layer Networks

no code implementations20 Apr 2022 Aseem Baranwal, Kimon Fountoulakis, Aukosh Jagannath

Graph Convolutional Networks (GCNs) are one of the most popular architectures that are used to solve classification problems accompanied by graphical information.

Node Classification Stochastic Block Model

Graph Attention Retrospective

1 code implementation26 Feb 2022 Kimon Fountoulakis, Amit Levi, Shenghao Yang, Aseem Baranwal, Aukosh Jagannath

They were introduced to allow a node to aggregate information from features of neighbor nodes in a non-uniform way, in contrast to simple graph convolution which does not distinguish the neighbors of a node.

Graph Attention Node Classification +1

Local Hyper-Flow Diffusion

1 code implementation NeurIPS 2021 Kimon Fountoulakis, Pan Li, Shenghao Yang

Recently, hypergraphs have attracted a lot of attention due to their ability to capture complex relations among entities.

Clustering Community Detection +1

$p$-Norm Flow Diffusion for Local Graph Clustering

2 code implementations20 May 2020 Kimon Fountoulakis, Di Wang, Shenghao Yang

Local graph clustering and the closely related seed set expansion problem are primitives on graphs that are central to a wide range of analytic and learning tasks such as local clustering, community detection, nodes ranking and feature inference.

Clustering Community Detection +1

Statistical guarantees for local graph clustering

no code implementations11 Jun 2019 Wooseok Ha, Kimon Fountoulakis, Michael W. Mahoney

In this paper, we adopt a statistical perspective on local graph clustering, and we analyze the performance of the l1-regularized PageRank method~(Fountoulakis et.

Clustering Graph Clustering

A Short Introduction to Local Graph Clustering Methods and Software

1 code implementation17 Oct 2018 Kimon Fountoulakis, David F. Gleich, Michael W. Mahoney

Scalability problems led to the development of local graph clustering algorithms that come with a variety of theoretical guarantees.

Social and Information Networks

Avoiding Synchronization in First-Order Methods for Sparse Convex Optimization

no code implementations17 Dec 2017 Aditya Devarakonda, Kimon Fountoulakis, James Demmel, Michael W. Mahoney

Parallel computing has played an important role in speeding up convex optimization methods for big data analytics and large-scale machine learning (ML).

LASAGNE: Locality And Structure Aware Graph Node Embedding

no code implementations17 Oct 2017 Evgeniy Faerman, Felix Borutta, Kimon Fountoulakis, Michael W. Mahoney

For larger graphs with flat NCPs that are strongly expander-like, existing methods lead to random walks that expand rapidly, touching many dissimilar nodes, thereby leading to lower-quality vector representations that are less useful for downstream tasks.

Link Prediction Multi-Label Classification

Capacity Releasing Diffusion for Speed and Locality

no code implementations19 Jun 2017 Di Wang, Kimon Fountoulakis, Monika Henzinger, Michael W. Mahoney, Satish Rao

Thus, our CRD Process is the first local graph clustering algorithm that is not subject to the well-known quadratic Cheeger barrier.

Clustering Graph Clustering

A Randomized Rounding Algorithm for Sparse PCA

no code implementations13 Aug 2015 Kimon Fountoulakis, Abhisek Kundu, Eugenia-Maria Kontopoulou, Petros Drineas

We present and analyze a simple, two-step algorithm to approximate the optimal solution of the sparse PCA problem.

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