wehub-resource-sync
59 lines
1.5 KiB
Python
59 lines
1.5 KiB
Python
"""
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APPNP implementation in DGL.
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References
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----------
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Paper: https://arxiv.org/abs/1810.05997
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Author's code: https://github.com/klicperajo/ppnp
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"""
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import torch.nn as nn
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from dgl.nn.pytorch.conv import APPNPConv
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class APPNP(nn.Module):
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def __init__(
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self,
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g,
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in_feats,
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hiddens,
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n_classes,
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activation,
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feat_drop,
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edge_drop,
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alpha,
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k,
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):
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super(APPNP, self).__init__()
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self.g = g
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self.layers = nn.ModuleList()
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# input layer
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self.layers.append(nn.Linear(in_feats, hiddens[0]))
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# hidden layers
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for i in range(1, len(hiddens)):
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self.layers.append(nn.Linear(hiddens[i - 1], hiddens[i]))
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# output layer
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self.layers.append(nn.Linear(hiddens[-1], n_classes))
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self.activation = activation
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if feat_drop:
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self.feat_drop = nn.Dropout(feat_drop)
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else:
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self.feat_drop = lambda x: x
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self.propagate = APPNPConv(k, alpha, edge_drop)
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self.reset_parameters()
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def reset_parameters(self):
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for layer in self.layers:
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layer.reset_parameters()
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def forward(self, features):
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# prediction step
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h = features
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h = self.feat_drop(h)
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h = self.activation(self.layers[0](h))
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for layer in self.layers[1:-1]:
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h = self.activation(layer(h))
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h = self.layers[-1](self.feat_drop(h))
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# propagation step
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h = self.propagate(self.g, h)
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return h
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