GATConv

Graph Attention Network layer (Velickovic et al., 2018). Multi-head attention mechanism over graph edges. $\alpha_{ij} = \text{softmax}_j(\text{LeakyReLU}(\mathbf{a}^T [\mathbf{W}\mathbf{x}_i \| \mathbf{W}\mathbf{x}_j]))$

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