CuGraphRelGraphConv

class dgl.nn.pytorch.conv.CuGraphRelGraphConv(in_feat, out_feat, num_rels, regularizer=None, num_bases=None, bias=True, self_loop=True, dropout=0.0, apply_norm=False)

Bases: dgl.nn.pytorch.conv.cugraph_base.CuGraphBaseConv

An accelerated relational graph convolution layer from Modeling Relational Data with Graph Convolutional Networks that leverages the highly-optimized aggregation primitives in cugraph-ops.

See dgl.nn.pytorch.conv.RelGraphConv for mathematical model.

This module depends on pylibcugraphops package, which can be installed via conda install -c nvidia pylibcugraphops=23.04. pylibcugraphops 23.04 requires python 3.8.x or 3.10.x.

Note

This is an experimental feature.

Parameters

• in_feat (int) – Input feature size.

• out_feat (int) – Output feature size.

• num_rels (int) – Number of relations.

• regularizer (str, optional) –

  Which weight regularizer to use (“basis” or None):

  • ”basis” is for basis-decomposition.

  • None applies no regularization.

  Default: None.

• num_bases (int, optional) – Number of bases. It comes into effect when a regularizer is applied. Default: None.

• bias (bool, optional) – True if bias is added. Default: True.

• self_loop (bool, optional) – True to include self loop message. Default: True.

• dropout (float, optional) – Dropout rate. Default: 0.0.

• apply_norm (bool, optional) – True to normalize aggregation output by the in-degree of the destination node per edge type, i.e. \(|\mathcal{N}^r_i|\). Default: True.

Examples

>>> import dgl
>>> import torch
>>> from dgl.nn import CuGraphRelGraphConv
...
>>> device = 'cuda'
>>> g = dgl.graph(([0,1,2,3,2,5], [1,2,3,4,0,3])).to(device)
>>> feat = torch.ones(6, 10).to(device)
>>> conv = CuGraphRelGraphConv(
...     10, 2, 3, regularizer='basis', num_bases=2).to(device)
>>> etype = torch.tensor([0,1,2,0,1,2]).to(device)
>>> res = conv(g, feat, etype)
>>> res
tensor([[-1.7774, -2.0184],
        [-1.4335, -2.3758],
        [-1.7774, -2.0184],
        [-0.4698, -3.0876],
        [-1.4335, -2.3758],
        [-1.4331, -2.3295]], device='cuda:0', grad_fn=<AddBackward0>)

forward(g, feat, etypes, max_in_degree=None)

Forward computation.

Parameters

• g (DGLGraph) – The graph.

• feat (torch.Tensor) – A 2D tensor of node features. Shape: \((|V|, D_{in})\).

• etypes (torch.Tensor) – A 1D integer tensor of edge types. Shape: \((|E|,)\). Note that cugraph-ops only accepts edge type tensors in int32, so any input of other integer types will be casted into int32, thus introducing some overhead. Pass in int32 tensors directly for best performance.

• max_in_degree (int, optional) – Maximum in-degree of destination nodes. It is only effective when g is a DGLBlock, i.e., bipartite graph. When g is generated from a neighbor sampler, the value should be set to the corresponding fanout. If not given, max_in_degree will be calculated on-the-fly.

Returns

New node features. Shape: \((|V|, D_{out})\).

Return type

torch.Tensor

reset_parameters()

Reinitialize learnable parameters.