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# DGL Implementation of the SEAL Paper
This DGL example implements the link prediction model proposed in the paper
[Link Prediction Based on Graph Neural Networks](https://arxiv.org/pdf/1802.09691.pdf)
and [REVISITING GRAPH NEURAL NETWORKS FOR LINK PREDICTION](https://arxiv.org/pdf/2010.16103.pdf)
The author's codes of implementation is in [SEAL](https://github.com/muhanzhang/SEAL) (pytorch)
and [SEAL_ogb](https://github.com/facebookresearch/SEAL_OGB) (torch_geometric)
Example implementor
----------------------
This example was implemented by [Smile](https://github.com/Smilexuhc) during his intern work at the AWS Shanghai AI Lab.
The graph dataset used in this example
---------------------------------------
ogbl-collab
- NumNodes: 235868
- NumEdges: 2358104
- NumNodeFeats: 128
- NumEdgeWeights: 1
- NumValidEdges: 160084
- NumTestEdges: 146329
Dependencies
--------------------------------
- python 3.6+
- Pytorch 1.5.0+
- dgl 0.6.0 +
- ogb
- pandas
- tqdm
- scipy
How to run example files
--------------------------------
In the seal_dgl folder
run on cpu:
```shell script
python main.py --gpu_id=-1 --subsample_ratio=0.1
```
run on gpu:
```shell script
python main.py --gpu_id=0 --subsample_ratio=0.1
```
Performance
-------------------------
experiment on `ogbl-collab`
| method | valid-hits@50 | test-hits@50 |
| ------ | ------------- | ------------ |
| paper | 63.89(0.49) | 53.71(0.47) |
| ours | 63.56(0.71) | 53.61(0.78) |
Note: We only perform 5 trails in the experiment.