Search Results for author: Mert Kosan

Found 9 papers, 6 papers with code

Attribute-Enhanced Similarity Ranking for Sparse Link Prediction

no code implementations29 Nov 2024 João Mattos, Zexi Huang, Mert Kosan, Ambuj Singh, Arlei Silva

GNN-based methods treat link prediction as a binary classification problem and handle the extreme class imbalance -- real graphs are very sparse -- by sampling (uniformly at random) a balanced number of disconnected pairs not only for training but also for evaluation.

Attribute Binary Classification +4

Global Human-guided Counterfactual Explanations for Molecular Properties via Reinforcement Learning

1 code implementation19 Jun 2024 Danqing Wang, Antonis Antoniades, Kha-Dinh Luong, Edwin Zhang, Mert Kosan, Jiachen Li, Ambuj Singh, William Yang Wang, Lei LI

RLHEX provides a flexible framework to incorporate different human-designed principles into the counterfactual explanation generation process, aligning these explanations with domain expertise.

counterfactual Counterfactual Explanation +3

DGCLUSTER: A Neural Framework for Attributed Graph Clustering via Modularity Maximization

1 code implementation20 Dec 2023 Aritra Bhowmick, Mert Kosan, Zexi Huang, Ambuj Singh, Sourav Medya

Graph clustering is a fundamental and challenging task in the field of graph mining where the objective is to group the nodes into clusters taking into consideration the topology of the graph.

Clustering Graph Clustering +2

GNNX-BENCH: Unravelling the Utility of Perturbation-based GNN Explainers through In-depth Benchmarking

1 code implementation3 Oct 2023 Mert Kosan, Samidha Verma, Burouj Armgaan, Khushbu Pahwa, Ambuj Singh, Sourav Medya, Sayan Ranu

Motivated by this need, we present a benchmarking study on perturbation-based explainability methods for GNNs, aiming to systematically evaluate and compare a wide range of explainability techniques.

Benchmarking counterfactual

Link Prediction without Graph Neural Networks

3 code implementations23 May 2023 Zexi Huang, Mert Kosan, Arlei Silva, Ambuj Singh

Link prediction, which consists of predicting edges based on graph features, is a fundamental task in many graph applications.

Attribute Graph Learning +2

Global Counterfactual Explainer for Graph Neural Networks

1 code implementation21 Oct 2022 Mert Kosan, Zexi Huang, Sourav Medya, Sayan Ranu, Ambuj Singh

One way to address this is counterfactual reasoning where the objective is to change the GNN prediction by minimal changes in the input graph.

counterfactual Counterfactual Explanation +2

Event Detection on Dynamic Graphs

1 code implementation23 Oct 2021 Mert Kosan, Arlei Silva, Sourav Medya, Brian Uzzi, Ambuj Singh

In this paper, we propose DyGED, a simple yet novel deep learning model for event detection on dynamic graphs.

Decision Making Event Detection

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