1 INTRODUCTION

2 BACKGROUND
2.1 Graphs and GNNs
2.2 GNN Training and Inference
2.3 GNN Characterization

3 TAXONOMY
3.1 Principle of Taxonomy
3.2 Overview of Categorization

4 CHARACTERIZATION EFFORTS ON SHOGNNS

5 CHARACTERIZATION EFFORTS ON DHOGNNS

6 CHARACTERIZATION EFFORTS ON SHEGNNS

7 CHARACTERIZATION EFFORTS ON DHEGNNS

8 SUMMARY AND COMPARISON

9 FUTURE DIRECTIONS AND CONCLUSION
9.1 Future Directions
9.2 Conclusion