Learnable Aggregator for Graph Convolutional Networks in TensorFlow

Implementation of Learnable Aggregator for Graph Convolutional Networks in TensorFlow.

Learnable Aggregator for GCN (LA-GCN) by introducing a shared auxiliary model that provides a customized schema in neighborhood aggregation. Under this framework, a new model proposed called LA-GCN(Mask) consisting of a new aggregator function, mask aggregator. The auxiliary model learns a specific mask for each neighbor of a given node, allowing both node-level and feature-level attention. This mechanism learns to assign different importance to both nodes and features for prediction, which provides interpretable explanations for prediction and increases the model robustness. [1]

Li Zhang ,Haiping Lu, A Feature-Importance-Aware and Robust Aggregator for GCN (CIKM 2020)

For official implementation

Requirements

• tensorflow_version 1.x

Training

python train.py

You can also try out in colab if you don't have any requirements!

Note: Since random inits, your training results may not exact the same as reported in the paper!

Data

In order to use your own data, you have to provide

• an N by N adjacency matrix (N is the number of nodes),
• an N by D feature matrix (D is the number of features per node), and
• an N by E binary label matrix (E is the number of classes). [2]

Have a look at the load_data() function in utils.py for an example.

In this example, we load citation network data (Cora, Citeseer or Pubmed). The original datasets can be found here: http://www.cs.umd.edu/~sen/lbc-proj/LBC.html. In our version (see data folder) we use dataset splits provided by https://github.com/kimiyoung/planetoid (Zhilin Yang, William W. Cohen, Ruslan Salakhutdinov, Revisiting Semi-Supervised Learning with Graph Embeddings, ICML 2016).

You can specify a dataset by editing train.py

Models

You can choose between the following models:

• gcn_mask: Learnable Aggregator for Graph Convolutional Networks (Li Zhang ,Haiping Lu, A Feature-Importance-Aware and Robust Aggregator for GCN, CIKM 2020)
• gcn: Graph convolutional network (Thomas N. Kipf, Max Welling, Semi-Supervised Classification with Graph Convolutional Networks, 2016)
• gcn_cheby: Chebyshev polynomial version of graph convolutional network as described in (Michaël Defferrard, Xavier Bresson, Pierre Vandergheynst, Convolutional Neural Networks on Graphs with Fast Localized Spectral Filtering, NIPS 2016)

Reference

[1] Zhang & Lu, A Feature-Importance-Aware and Robust Aggregator for GCN, CIKM 2020

[2] Kipf & Welling, Semi-Supervised Classification with Graph Convolutional Networks, 2016

Citation

@inproceedings{zhang2020feature,
  title={A Feature-Importance-Aware and Robust Aggregator for GCN},
  author={Zhang, Li and Lu, Haiping},
  booktitle={Proceedings of the 29th ACM International Conference on Information \& Knowledge Management},
  pages={1813--1822},
  year={2020}
}

@article{kipf2016semi,
  title={Semi-supervised classification with graph convolutional networks},
  author={Kipf, Thomas N and Welling, Max},
  journal={arXiv preprint arXiv:1609.02907},
  year={2016}
}