class_docstr: Example GNN layer
  
      
class_docstr_tok: ["Example","GNN","layer"]
code: def forward(self, x, edge_index):
      """"""
      x = torch.matmul(x, self.weight)
  
      return self.propagate(edge_index, x=x)
  
imports: import torch
  import torch.nn
  from torch.nn import Parameter
  from torch_geometric.nn.conv import MessagePassing
  from torch_geometric.nn.inits import glorot, zeros
  from graphgym.config import cfg
  from graphgym.register import register_layer
label_desc: Use image node_id 3 for calling the ExampleConv2Layer obj's underlying member method code with example usage: obj.forward(x, edge_index) and returns: self