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.
1 code implementation • 24 Feb 2025 • George Giapitzakis, Artur Back de Luca, Kimon Fountoulakis
The ability of an architecture to realize permutations is quite fundamental.
1 code implementation • 1 Dec 2024 • Muhammad Fetrat Qharabagh, Mohammadreza Ghofrani, Kimon Fountoulakis
Counting is a fundamental operation for various visual tasks in real-life applications, requiring both object recognition and robust counting capabilities.
1 code implementation • 2 Oct 2024 • Artur Back de Luca, George Giapitzakis, Shenghao Yang, Petar Veličković, Kimon Fountoulakis
We analyze their in-distribution learnability and explore how parameter norms in positional attention affect sample complexity.
no code implementations • 22 May 2024 • Robert Wang, Aseem Baranwal, Kimon Fountoulakis
In this paper, we provide a rigorous theoretical analysis, based on the two-class contextual stochastic block model (CSBM), of the performance of vanilla graph convolution from which we remove the principal eigenvector to avoid oversmoothing.
no code implementations • 2 Feb 2024 • Artur Back de Luca, Kimon Fountoulakis
The architecture we use is a looped transformer with extra attention heads that interact with the graph.
no code implementations • 12 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.
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.
no code implementations • 18 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.
no code implementations • 20 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.
1 code implementation • 26 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.
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.
2 code implementations • 13 Feb 2021 • Aseem Baranwal, Kimon Fountoulakis, Aukosh Jagannath
Recently there has been increased interest in semi-supervised classification in the presence of graphical information.
General Classification
Out-of-Distribution Generalization
+1
2 code implementations • 20 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.
no code implementations • 11 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.
1 code implementation • 17 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
no code implementations • 17 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).
no code implementations • 17 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.
no code implementations • ICML 2017 • Di Wang, Kimon Fountoulakis, Monika Henzinger, Michael W. Mahoney, Satish Rao
As an application, we use our CRD Process to develop an improved local algorithm for graph clustering.
no code implementations • 19 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.
no code implementations • 13 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.