论文标题

Graphlime:图形神经网络的局部可解释模型说明

GraphLIME: Local Interpretable Model Explanations for Graph Neural Networks

论文作者

Huang, Qiang, Yamada, Makoto, Tian, Yuan, Singh, Dinesh, Yin, Dawei, Chang, Yi

论文摘要

图形结构化数据在各个领域中具有广泛的适用性,例如物理,化学,生物学,计算机视觉和社交网络,仅举几例。最近,由于其良好的性能和概括能力,图表神经网络(GNN)在有效地表示图结构数据方面已成功。 GNN是一种基于深度学习的方法,它通过结合特定节点和图的结构/拓扑信息来学习节点表示。但是,与其他深层模型一样,解释GNN模型的有效性是一项艰巨的任务,因为对迭代进行了复杂的非线性转换。在本文中,我们建议使用Hilbert-Schmidt独立标准(HSIC)LASSO的图形解释,这是一种非线性特征选择方法。 Graphlime是一个通用的GNN模型解释框架,它在要解释的节点的子图中学习了一个非线性解释模型。更具体地说,要解释一个节点,我们从其$ n $ -HOP邻域中生成了一个非线性解释模型,然后计算K最具代表性的功能作为使用HSIC LASSO的预测的解释。通过在两个现实世界数据集上的实验,与现有的解释方法相比,发现图形的解释具有非凡的程度和描述性。

Graph structured data has wide applicability in various domains such as physics, chemistry, biology, computer vision, and social networks, to name a few. Recently, graph neural networks (GNN) were shown to be successful in effectively representing graph structured data because of their good performance and generalization ability. GNN is a deep learning based method that learns a node representation by combining specific nodes and the structural/topological information of a graph. However, like other deep models, explaining the effectiveness of GNN models is a challenging task because of the complex nonlinear transformations made over the iterations. In this paper, we propose GraphLIME, a local interpretable model explanation for graphs using the Hilbert-Schmidt Independence Criterion (HSIC) Lasso, which is a nonlinear feature selection method. GraphLIME is a generic GNN-model explanation framework that learns a nonlinear interpretable model locally in the subgraph of the node being explained. More specifically, to explain a node, we generate a nonlinear interpretable model from its $N$-hop neighborhood and then compute the K most representative features as the explanations of its prediction using HSIC Lasso. Through experiments on two real-world datasets, the explanations of GraphLIME are found to be of extraordinary degree and more descriptive in comparison to the existing explanation methods.

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