Source code for torch_geometric.nn.conv.cg_conv

from typing import Union, Tuple
from torch_geometric.typing import PairTensor, Adj, OptTensor, Size

import torch
from torch import Tensor
import torch.nn.functional as F
from torch.nn import Linear, BatchNorm1d
from torch_geometric.nn.conv import MessagePassing

[docs]class CGConv(MessagePassing): r"""The crystal graph convolutional operator from the `"Crystal Graph Convolutional Neural Networks for an Accurate and Interpretable Prediction of Material Properties" <>`_ paper .. math:: \mathbf{x}^{\prime}_i = \mathbf{x}_i + \sum_{j \in \mathcal{N}(i)} \sigma \left( \mathbf{z}_{i,j} \mathbf{W}_f + \mathbf{b}_f \right) \odot g \left( \mathbf{z}_{i,j} \mathbf{W}_s + \mathbf{b}_s \right) where :math:`\mathbf{z}_{i,j} = [ \mathbf{x}_i, \mathbf{x}_j, \mathbf{e}_{i,j} ]` denotes the concatenation of central node features, neighboring node features and edge features. In addition, :math:`\sigma` and :math:`g` denote the sigmoid and softplus functions, respectively. Args: channels (int or tuple): Size of each input sample. A tuple corresponds to the sizes of source and target dimensionalities. dim (int, optional): Edge feature dimensionality. (default: :obj:`0`) aggr (string, optional): The aggregation operator to use (:obj:`"add"`, :obj:`"mean"`, :obj:`"max"`). (default: :obj:`"add"`) batch_norm (bool, optional): If set to :obj:`True`, will make use of batch normalization. (default: :obj:`False`) bias (bool, optional): If set to :obj:`False`, the layer will not learn an additive bias. (default: :obj:`True`) **kwargs (optional): Additional arguments of :class:`torch_geometric.nn.conv.MessagePassing`. """ def __init__(self, channels: Union[int, Tuple[int, int]], dim: int = 0, aggr: str = 'add', batch_norm: bool = False, bias: bool = True, **kwargs): super(CGConv, self).__init__(aggr=aggr, **kwargs) self.channels = channels self.dim = dim self.batch_norm = batch_norm if isinstance(channels, int): channels = (channels, channels) self.lin_f = Linear(sum(channels) + dim, channels[1], bias=bias) self.lin_s = Linear(sum(channels) + dim, channels[1], bias=bias) = BatchNorm1d(channels[1]) self.reset_parameters()
[docs] def reset_parameters(self): self.lin_f.reset_parameters() self.lin_s.reset_parameters()
[docs] def forward(self, x: Union[Tensor, PairTensor], edge_index: Adj, edge_attr: OptTensor = None, size: Size = None) -> Tensor: """""" if isinstance(x, Tensor): x: PairTensor = (x, x) # propagate_type: (x: PairTensor, edge_attr: OptTensor) out = self.propagate(edge_index, x=x, edge_attr=edge_attr, size=size) out = if self.batch_norm else out out += x[1] return out
def message(self, x_i, x_j, edge_attr: OptTensor) -> Tensor: if edge_attr is None: z =[x_i, x_j], dim=-1) else: z =[x_i, x_j, edge_attr], dim=-1) return self.lin_f(z).sigmoid() * F.softplus(self.lin_s(z)) def __repr__(self): return '{}({}, dim={})'.format(self.__class__.__name__, self.channels, self.dim)