Search Results for author: Costas Mavromatis

Found 9 papers, 6 papers with code

Pack of LLMs: Model Fusion at Test-Time via Perplexity Optimization

no code implementations17 Apr 2024 Costas Mavromatis, Petros Karypis, George Karypis

PackLLM performs model fusion by solving an optimization problem for determining each LLM's importance, so that perplexity over the input prompt is minimized.

SemPool: Simple, robust, and interpretable KG pooling for enhancing language models

no code implementations3 Feb 2024 Costas Mavromatis, Petros Karypis, George Karypis

Our method, termed SemPool, represents KG facts with pre-trained LMs, learns to aggregate their semantic information, and fuses it at different layers of the LM.

Question Answering

Train Your Own GNN Teacher: Graph-Aware Distillation on Textual Graphs

1 code implementation20 Apr 2023 Costas Mavromatis, Vassilis N. Ioannidis, Shen Wang, Da Zheng, Soji Adeshina, Jun Ma, Han Zhao, Christos Faloutsos, George Karypis

Different from conventional knowledge distillation, GRAD jointly optimizes a GNN teacher and a graph-free student over the graph's nodes via a shared LM.

Knowledge Distillation Node Classification

ReaRev: Adaptive Reasoning for Question Answering over Knowledge Graphs

1 code implementation24 Oct 2022 Costas Mavromatis, George Karypis

Our method, termed ReaRev, introduces a new way to KGQA reasoning with respect to both instruction decoding and execution.

Graph Question Answering Knowledge Graphs +3

TempoQR: Temporal Question Reasoning over Knowledge Graphs

1 code implementation10 Dec 2021 Costas Mavromatis, Prasanna Lakkur Subramanyam, Vassilis N. Ioannidis, Soji Adeshina, Phillip R. Howard, Tetiana Grinberg, Nagib Hakim, George Karypis

The first computes a textual representation of a given question, the second combines it with the entity embeddings for entities involved in the question, and the third generates question-specific time embeddings.

Entity Embeddings Graph Question Answering +4

HeMI: Multi-view Embedding in Heterogeneous Graphs

1 code implementation14 Sep 2021 Costas Mavromatis, George Karypis

Many real-world graphs involve different types of nodes and relations between nodes, being heterogeneous by nature.

Clustering Link Prediction +3

Unveiling Anomalous Edges and Nominal Connectivity of Attributed Networks

no code implementations17 Apr 2021 Konstantinos D. Polyzos, Costas Mavromatis, Vassilis N. Ioannidis, Georgios B. Giannakis

Uncovering anomalies in attributed networks has recently gained popularity due to its importance in unveiling outliers and flagging adversarial behavior in a gamut of data and network science applications including {the Internet of Things (IoT)}, finance, security, to list a few.

Graph InfoClust: Leveraging cluster-level node information for unsupervised graph representation learning

2 code implementations15 Sep 2020 Costas Mavromatis, George Karypis

Motivated by this observation, we propose a graph representation learning method called Graph InfoClust (GIC), that seeks to additionally capture cluster-level information content.

Clustering Graph Representation Learning +3

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