Costas Mavromatis

26 papers A* 3Misc 2Journal 14Unranked 7
YearRankTypeTitle / Venue / Authors
2026 J jnl
Train Less, Learn More: Adaptive Efficient Rollout Optimization for Group-Based Reinforcement Learning.
CoRR
Zhi Zhang, Zhen Han, Costas Mavromatis, Qi Zhu, Yunyi Zhang, Sheng Guan, Dingmin Wang, Xiong Zhou, Shuai Wang, Soji Adeshina, Vassilis N. Ioannidis, Huzefa Rangwala
2025 A* conf
BYOKG-RAG: Multi-Strategy Graph Retrieval for Knowledge Graph Question Answering.
EMNLP
Costas Mavromatis, Soji Adeshina, Vassilis N. Ioannidis, Zhen Han, Qi Zhu, Ian Robinson, Bryan Thompson, Huzefa Rangwala, George Karypis
2025 J jnl
BYOKG-RAG: Multi-Strategy Graph Retrieval for Knowledge Graph Question Answering.
CoRR
Costas Mavromatis, Soji Adeshina, Vassilis N. Ioannidis, Zhen Han, Qi Zhu, Ian Robinson, Bryan Thompson, Huzefa Rangwala, George Karypis
2025 — conf
GNN-RAG: Graph Neural Retrieval for Efficient Large Language Model Reasoning on Knowledge Graphs.
ACL (Findings)
Costas Mavromatis, George Karypis
2025 — conf
HybGRAG: Hybrid Retrieval-Augmented Generation on Textual and Relational Knowledge Bases.
ACL (1)
Meng-Chieh Lee, Qi Zhu, Costas Mavromatis, Zhen Han, Soji Adeshina, Vassilis N. Ioannidis, Huzefa Rangwala, Christos Faloutsos
2025 — conf
SKnow-LLM Workshop: Structured Knowledge for Large Language Models.
KDD (2)
Qi Zhu, Xiusi Chen, Yu Zhang, Soji Adeshina, Costas Mavromatis, Zhen Han, Vassilis N. Ioannidis, Leman Akoglu, Danai Koutra, Huzefa Rangwala
2025 J jnl
The Kinetics of Reasoning: How Chain-of-Thought Shapes Learning in Transformers?
CoRR
Zihan Pengmei, Costas Mavromatis, Zhengyuan Shen, Yunyi Zhang, Vassilis N. Ioannidis, Huzefa Rangwala
2024 A* conf
CoverICL: Selective Annotation for In-Context Learning via Active Graph Coverage.
EMNLP
Costas Mavromatis, Balasubramaniam Srinivasan, Zhengyuan Shen, Jiani Zhang, Huzefa Rangwala, Christos Faloutsos, George Karypis
2024 J jnl
GNN-RAG: Graph Neural Retrieval for Large Language Model Reasoning.
CoRR
Costas Mavromatis, George Karypis
2024 J jnl
HybGRAG: Hybrid Retrieval-Augmented Generation on Textual and Relational Knowledge Bases.
CoRR
Meng-Chieh Lee, Qi Zhu, Costas Mavromatis, Zhen Han, Soji Adeshina, Vassilis N. Ioannidis, Huzefa Rangwala, Christos Faloutsos
2024 J jnl
Pack of LLMs: Model Fusion at Test-Time via Perplexity Optimization.
CoRR
Costas Mavromatis, Petros Karypis, George Karypis
2024 — conf
SemPool: Simple, Robust, and Interpretable KG Pooling for Enhancing Language Models.
PKDD (4)
Costas Mavromatis, Petros Karypis, George Karypis
2024 J jnl
SemPool: Simple, robust, and interpretable KG pooling for enhancing language models.
CoRR
Costas Mavromatis, Petros Karypis, George Karypis
2023 Misc conf
Global and Nodal Mutual Information Maximization in Heterogeneous Graphs.
ICASSP
Costas Mavromatis, George Karypis
2023 — conf
Train Your Own GNN Teacher: Graph-Aware Distillation on Textual Graphs.
ECML/PKDD (3)
Costas Mavromatis, Vassilis N. Ioannidis, Shen Wang, Da Zheng, Soji Adeshina, Jun Ma, Han Zhao, Christos Faloutsos, George Karypis
2023 J jnl
Train Your Own GNN Teacher: Graph-Aware Distillation on Textual Graphs.
CoRR
Costas Mavromatis, Vassilis N. Ioannidis, Shen Wang, Da Zheng, Soji Adeshina, Jun Ma, Han Zhao, Christos Faloutsos, George Karypis
2023 J jnl
Which Examples to Annotate for In-Context Learning? Towards Effective and Efficient Selection.
CoRR
Costas Mavromatis, Balasubramaniam Srinivasan, Zhengyuan Shen, Jiani Zhang, Huzefa Rangwala, Christos Faloutsos, George Karypis
2022 — conf
ReaRev: Adaptive Reasoning for Question Answering over Knowledge Graphs.
EMNLP (Findings)
Costas Mavromatis, George Karypis
2022 J jnl
ReaRev: Adaptive Reasoning for Question Answering over Knowledge Graphs.
CoRR
Costas Mavromatis, George Karypis
2022 A* conf
TempoQR: Temporal Question Reasoning over Knowledge Graphs.
AAAI
Costas Mavromatis, Prasanna Lakkur Subramanyam, Vassilis N. Ioannidis, Adesoji Adeshina, Phillip Ryan Howard, Tetiana Grinberg, Nagib Hakim, George Karypis
2021 — conf
Graph InfoClust: Maximizing Coarse-Grain Mutual Information in Graphs.
PAKDD (1)
Costas Mavromatis, George Karypis
2021 J jnl
HeMI: Multi-view Embedding in Heterogeneous Graphs.
CoRR
Costas Mavromatis, George Karypis
2021 J jnl
TempoQR: Temporal Question Reasoning over Knowledge Graphs.
CoRR
Costas Mavromatis, Prasanna Lakkur Subramanyam, Vassilis N. Ioannidis, Soji Adeshina, Phillip Ryan Howard, Tetiana Grinberg, Nagib Hakim, George Karypis
2021 J jnl
Unveiling Anomalous Edges and Nominal Connectivity of Attributed Networks.
CoRR
Konstantinos D. Polyzos, Costas Mavromatis, Vassilis N. Ioannidis, Georgios B. Giannakis
2020 J jnl
Graph InfoClust: Leveraging cluster-level node information for unsupervised graph representation learning.
CoRR
Costas Mavromatis, George Karypis
2020 Misc conf
Unveiling Anomalous Edges and Nominal Connectivity of Attributed Networks.
ACSSC
Konstantinos D. Polyzos, Costas Mavromatis, Vassilis N. Ioannidis, Georgios B. Giannakis