class_docstr: Example GNN layer.
code: def update(self, aggr_out):
      if self.bias is not None:
          aggr_out = aggr_out + self.bias
      return aggr_out
  
imports: import torch
  import torch.nn
  from torch.nn import Parameter
  from torch_geometric.graphgym.config import cfg
  from torch_geometric.graphgym.register import register_layer
  from torch_geometric.nn.conv import MessagePassing
  from torch_geometric.nn.inits import glorot, zeros
label_desc: Use image node_id 5 for calling the ExampleConv1 obj's underlying member method code with example usage: obj.update(aggr_out) and returns: aggr_out