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Problem description

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mindspore_gl.nn.MaxPooling

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class mindspore_gl.nn.MaxPooling[source]

Apply maximum pooling to the nodes in the batched graph.

r(i)=maxk=1Ni(xk(i))
Inputs:
  • x (Tensor) - The input node features to be updated. The shape is (N,D) where N is the number of nodes, and D is the feature size of nodes.

  • g (BatchedGraph) - The input graph.

Outputs:
  • x (Tensor) - The output representation for graphs. The shape is (2,Dout) where Dout is the feature size of nodes.

Supported Platforms:

Ascend GPU

Examples

>>> import numpy as np
>>> import mindspore as ms
>>> from mindspore_gl.nn import MaxPooling
>>> from mindspore_gl import BatchedGraphField
>>> n_nodes = 7
>>> n_edges = 8
>>> src_idx = ms.Tensor([0, 2, 2, 3, 4, 5, 5, 6], ms.int32)
>>> dst_idx = ms.Tensor([1, 0, 1, 5, 3, 4, 6, 4], ms.int32)
>>> ver_subgraph_idx = ms.Tensor([0, 0, 0, 1, 1, 1, 1], ms.int32)
>>> edge_subgraph_idx = ms.Tensor([0, 0, 0, 1, 1, 1, 1, 1], ms.int32)
>>> graph_mask = ms.Tensor([1, 1], ms.int32)
>>> batched_graph_field = BatchedGraphField(src_idx, dst_idx, n_nodes, n_edges, ver_subgraph_idx,
...                                         edge_subgraph_idx, graph_mask)
>>> node_feat = np.random.random((n_nodes, 4))
>>> node_feat = ms.Tensor(node_feat, ms.float32)
>>> net = MaxPooling()
>>> ret = net(node_feat, *batched_graph_field.get_batched_graph())
>>> print(ret.shape)
(2, 4)