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02456-deep-learning-final-projektet

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    DIFF GRAPH U-NET: A DIFFERENTIAL GRAPH U-SHAPE NETWORK FOR GRAPH CLASSIFICATION

    Introduction

    Regarding GCNs, there are mainly three tasks: node classification, link prediction, and graph classification. This project focuses on the classification of graphics through Differentiable Pooling (DIFFPOOL). DIFFPOOL is a state-of-the-art pool module that can learn the hierarchical expression of graphics and combine various end-to-end GCN structures. Hence, in order to research the changes of a graph after several DIFFPOOL modules respectively, the visualizations for pooling has been fulfilled via rebuilding the graph. Apart from DIFFPOOL, this project also explored the possibility to build an encoder-decoder architecture via building such a U-net-like method for graph data. A novel GCN architecture DIFF Graph U-Net is proposed.

    Author

    Manxi Lin s192230

    Mengge Hu s192113

    Guangya Shen s200104

    Data set

    https://drive.google.com/file/d/1nTM9c4HgIeb6iFauLQABuGjqDGpc43iv/view?usp=sharing

    Unzip it in here

    Check our main result

    • See main.ipynb
    • Proof of our result: ./screenshots

    Our contribution

    • Revision in encoders.py and train.py to implement DIFF Graph U-Net
    • Implement sample_data.py to sample data sets
    • Display our main result in a jupyter notebook main.ipynb

    DIFFPOOL

    Repo Link https://github.com/RexYing/diffpool

    DIFFPOOL Introduction (from the origional repo)

    Recently, graph neural networks (GNNs) have revolutionized the field of graph representation learning through effectively learned node embeddings, and achieved state-of-the-art results in tasks such as node classification and link prediction. However, current GNN methods are inherently flat and do not learn hierarchical representations of graphs—a limitation that is especially problematic for the task of graph classification, where the goal is to predict the label associated with an entire graph. Here we propose DIFFPOOL, a differentiable graph pooling module that can generate hierarchical representations of graphs and can be combined with various graph neural network architectures in an end-to-end fashion. DIFFPOOL learns a differentiable soft cluster assignment for nodes at each layer of a deep GNN, mapping nodes to a set of clusters, which then form the coarsened input for the next GNN layer. Our experimental results show that combining existing GNN methods with DIFFPOOL yields an average improvement of 5–10% accuracy on graph classification benchmarks, compared to all existing pooling approaches, achieving a new state-of-the-art on four out of five benchmark data sets.

    Paper link: https://arxiv.org/pdf/1806.08804.pdf