code: def __init__(self, in_dim, out_dim, hid_dim=40):
      super().__init__()
      self.in_layer = Layer(in_dim, hid_dim)
      self.hid_layer = Layer(hid_dim, hid_dim)
      self.out_layer = Layer(hid_dim, out_dim)
  
file_path: dgl/examples/pytorch/gnn_explainer/models.py
imports: import dgl.function
  import torch
  import torch.nn
  import torch.nn.functional
label_desc: Use image node_id 1 to create a new Model object from inherited base classes: nn with example: obj = Model(in_dim, out_dim, hid_dim)