Search Results for author: Sungsu Lim

Found 10 papers, 4 papers with code

Hyperbolic Heterogeneous Graph Attention Networks

no code implementations15 Apr 2024 Jongmin Park, SeungHoon Han, Soohwan Jeong, Sungsu Lim

Most previous heterogeneous graph embedding models represent elements in a heterogeneous graph as vector representations in a low-dimensional Euclidean space.

Clustering Graph Attention +2

Label-based Graph Augmentation with Metapath for Graph Anomaly Detection

2 code implementations21 Aug 2023 Hwan Kim, JungHoon Kim, Byung Suk Lee, Sungsu Lim

To further efficiently exploit context information from metapath-based anomaly subgraph, we present a new framework, Metapath-based Graph Anomaly Detection (MGAD), incorporating GCN layers in both the dual-encoders and decoders to efficiently propagate context information between abnormal and normal nodes.

Graph Anomaly Detection Semi-supervised Anomaly Detection +1

Graph Anomaly Detection with Graph Neural Networks: Current Status and Challenges

no code implementations29 Sep 2022 Hwan Kim, Byung Suk Lee, Won-Yong Shin, Sungsu Lim

Graphs are used widely to model complex systems, and detecting anomalies in a graph is an important task in the analysis of complex systems.

Graph Anomaly Detection Graph Classification +2

SiReN: Sign-Aware Recommendation Using Graph Neural Networks

1 code implementation19 Aug 2021 Changwon Seo, Kyeong-Joong Jeong, Sungsu Lim, Won-Yong Shin

In recent years, many recommender systems using network embedding (NE) such as graph neural networks (GNNs) have been extensively studied in the sense of improving recommendation accuracy.

Network Embedding Recommendation Systems

Greedification Operators for Policy Optimization: Investigating Forward and Reverse KL Divergences

no code implementations17 Jul 2021 Alan Chan, Hugo Silva, Sungsu Lim, Tadashi Kozuno, A. Rupam Mahmood, Martha White

Approximate Policy Iteration (API) algorithms alternate between (approximate) policy evaluation and (approximate) greedification.

Policy Gradient Methods

TornadoAggregate: Accurate and Scalable Federated Learning via the Ring-Based Architecture

no code implementations6 Dec 2020 Jin-woo Lee, Jaehoon Oh, Sungsu Lim, Se-Young Yun, Jae-Gil Lee

Federated learning has emerged as a new paradigm of collaborative machine learning; however, many prior studies have used global aggregation along a star topology without much consideration of the communication scalability or the diurnal property relied on clients' local time variety.

Federated Learning

SSumM: Sparse Summarization of Massive Graphs

2 code implementations1 Jun 2020 Kyuhan Lee, Hyeonsoo Jo, Jihoon Ko, Sungsu Lim, Kijung Shin

SSumM not only merges nodes together but also sparsifies the summary graph, and the two strategies are carefully balanced based on the minimum description length principle.

Databases Social and Information Networks H.2.8

Maximizing Information Gain in Partially Observable Environments via Prediction Reward

no code implementations11 May 2020 Yash Satsangi, Sungsu Lim, Shimon Whiteson, Frans Oliehoek, Martha White

Information gathering in a partially observable environment can be formulated as a reinforcement learning (RL), problem where the reward depends on the agent's uncertainty.

Question Answering Reinforcement Learning (RL)

Greedy Actor-Critic: A New Conditional Cross-Entropy Method for Policy Improvement

1 code implementation22 Oct 2018 Samuel Neumann, Sungsu Lim, Ajin Joseph, Yangchen Pan, Adam White, Martha White

We first provide a policy improvement result in an idealized setting, and then prove that our conditional CEM (CCEM) strategy tracks a CEM update per state, even with changing action-values.

Policy Gradient Methods Q-Learning

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