code: def __init__(self):
      super().__init__()
      self.conv1 = GCNConv(3, 16)
      self.conv2 = GCNConv(16, 16)
      self.lin = Linear(16, 7)
  
file_path: pytorch_geometric/test/contrib/nn/models/test_rbcd_attack.py
imports: import pytest
  import torch
  from torch.nn import Linear
  from torch_geometric.contrib.nn import GRBCDAttack, PRBCDAttack
  from torch_geometric.nn import GCNConv, global_add_pool
  from torch_geometric.utils import to_undirected
label_desc: Use image node_id 1 to create a new GNN object from inherited base classes: torch.nn with example: obj = GNN()