Core Concepts
Graph Contrastive Invariant Learning improves graph representation by considering causal factors.
Abstract
Abstract:
Graph Contrastive Learning (GCL) attracts attention for self-supervised node representation.
Traditional GCL may not learn invariant representations due to non-causal information.
Proposed GCIL method enhances GCL by focusing on causal factors.
Introduction:
Graph Neural Networks (GNNs) excel in aggregating information from neighborhoods.
Self-supervised learning gains popularity due to label-free settings.
Related Work:
GNNs like GCN, GAT, and GraphSAGE show competitive performance.
Self-supervised methods like DGI, MVGRL, and GRACE have been successful.
Causal Analysis on GCL:
Structural causal model (SCM) analysis reveals the importance of causal and non-causal factors.
GCL may fail to capture invariant causal factors due to graph augmentation strategies.
The Proposed Model: GCIL:
GCIL introduces spectral graph augmentation and invariance/independence objectives.
Invariance objective ensures consistent representations, while the independence objective eliminates confounders' influence.
Experiments:
GCIL outperforms baselines on node classification tasks across various datasets.
Ablation Studies:
Invariance objective has the most significant impact on performance.
Independence objective and spectral augmentation also contribute to improved results.
Hyper-parameter Sensitivity:
α, β, and γ hyper-parameters influence the model's performance.
Visualization:
Correlation matrix visualization shows GCIL effectively captures orthogonal information in representations.
Stats
GCL ist in der Lage, invariante Repräsentationen zu lernen, indem positive und negative Paare kontrastiert werden.
Die SCM zeigt, dass GCL Schwierigkeiten hat, kausale Variablen zu erfassen.
GCIL verwendet spektrale Graphaugmentation und Invarianz-/Unabhängigkeitsziele.
Quotes
"Die SCM zeigt, dass GCL Schwierigkeiten hat, kausale Variablen zu erfassen."
"GCIL verwendet spektrale Graphaugmentation und Invarianz-/Unabhängigkeitsziele."