mindspore_gl.nn.GCNConv

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class mindspore_gl.nn.GCNConv(in_feat_size: int, out_size: int, activation=None, dropout=0.5)[source]

Graph Convolution Network Layer. From the paper Semi-Supervised Classification with Graph Convolutional Networks .

\[h_i^{(l+1)} = \sigma(b^{(l)} + \sum_{j\in\mathcal{N}(i)}\frac{1}{c_{ji}}h_j^{(l)}W^{(l)})\]

\(\mathcal{N}(i)\) represents the neighbour node of \(i\). \(c_{ji} = \sqrt{|\mathcal{N}(j)|}\sqrt{|\mathcal{N}(i)|}\).

\[h_i^{(l+1)} = \sigma(b^{(l)} + \sum_{j\in\mathcal{N}(i)}\frac{e_{ji}}{c_{ji}}h_j^{(l)}W^{(l)})\]
Parameters

  • in_feat_size (int) – Input node feature size.

  • out_size (int) – Output node feature size.

  • activation (Cell, optional) – Activation function. Default: None.

  • dropout (float, optional) – The dropout rate, greater than 0 and less equal than 1. E.g. dropout=0.1, dropping out 10% of input units. Default: 0.5.

Inputs:

  • x (Tensor) - The input node features. The shape is \((N, D_{in})\) where \(N\) is the number of nodes, and \(D_{in}\) should be equal to in_feat_size in Args.

  • in_deg (Tensor) - In degree for nodes. The shape is \((N, )\) where \(N\) is the number of nodes.

  • out_deg (Tensor) - Out degree for nodes. The shape is \((N, )\) where \(N\) is the number of nodes.

  • g (Graph) - The input graph.

Outputs:

  • Tensor, output node features with shape of \((N, D_{out})\), where \((D_{out})\) should be the same as out_size in Args.

Raises

  • TypeError – If in_feat_size or out_size is not an int.

  • TypeError – If dropout is not a float.

  • TypeError – If activation is not a mindspore.nn.Cell.

  • ValueError – If dropout is not in range (0.0, 1.0]

Supported Platforms:

Ascend GPU

Examples

>>> import mindspore as ms
>>> from mindspore_gl.nn import GCNConv
>>> from mindspore_gl import GraphField
>>> n_nodes = 4
>>> n_edges = 7
>>> feat_size = 4
>>> src_idx = ms.Tensor([0, 1, 1, 2, 2, 3, 3], ms.int32)
>>> dst_idx = ms.Tensor([0, 0, 2, 1, 3, 0, 1], ms.int32)
>>> ones = ms.ops.Ones()
>>> feat = ones((n_nodes, feat_size), ms.float32)
>>> graph_field = GraphField(src_idx, dst_idx, n_nodes, n_edges)
>>> in_degree = ms.Tensor([3, 2, 1, 1], ms.int32)
>>> out_degree = ms.Tensor([1, 2, 1, 2], ms.int32)
>>> gcnconv = GCNConv(in_feat_size=4, out_size=2, activation=None, dropout=1.0)
>>> res = gcnconv(feat, in_degree, out_degree, *graph_field.get_graph())
>>> print(res.shape)
(4, 2)