Graph Attention Network
Graph Attention Network (GAT) · Also known as: Graf Dikkat Ağı (GAT), GAT, graph attention network, attention-based graph neural network
The Graph Attention Network (GAT), introduced by Veličković and colleagues in 2018, is a graph neural network variant that learns how much importance to assign to each neighbouring node through a self-attention mechanism. On heterogeneous neighbourhoods and relational classification it produces results superior to graph convolutional networks (GCN).
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When to use it
Use GAT when your data already has a graph structure with computed node features and you need node classification or relational learning, typically with at least around 200 nodes and ideally several hundred or more. It does not assume normally distributed data and works with continuous and categorical node features. A GPU is recommended. Below roughly 500 nodes the attention weights cannot be learned reliably and overfitting becomes a risk; with very small graphs (under about 100 nodes) classical machine-learning methods are the safer choice.
Strengths & limitations
- Learns neighbour importance through self-attention rather than treating all neighbours equally.
- Outperforms graph convolutional networks (GCN) on heterogeneous neighbourhoods and relational classification.
- Assumption-light: no normality requirement, and it handles continuous and categorical node features.
- Multiple attention heads stabilise learning on graph-structured data.
- Requires an existing graph structure and pre-computed node features.
- A GPU is recommended; training is computationally demanding.
- On small graphs (fewer than about 500 nodes) the attention weights are not learned reliably and the model overfits.
- With very small networks (under about 100 nodes) the model becomes meaningless and classical ML is preferable.
Frequently asked
How is GAT different from a graph convolutional network (GCN)?
A GCN combines a node's neighbours with weights that depend only on the graph structure, treating connections in a fixed way. GAT instead learns attention weights so each node decides which neighbours matter most, which is why it tends to do better on heterogeneous neighbourhoods and relational classification.
How much data does GAT need?
It is intended for graphs with at least around 200 nodes. Below roughly 500 nodes the attention weights are not learned reliably and overfitting becomes a real risk, and with very small networks (under about 100 nodes) classical machine-learning methods are the better choice.
Do I need a GPU to use GAT?
A GPU is recommended. As a deep learning model trained over graph neighbourhoods with multiple attention heads, GAT is computationally demanding, and a GPU makes training practical.
What do I need before applying GAT?
You need an existing graph structure and node features that have already been computed, since the attention mechanism operates on the features of connected nodes.
Sources
How to cite this page
ScholarGate. (2026, June 1). Graph Attention Network (GAT). ScholarGate. https://scholargate.app/en/deep-learning/graph-attention-network
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