code: def decoder(self, z):
      adj_rec = torch.sigmoid(torch.matmul(z, z.t()))
      return adj_rec
  
file_path: dgl/examples/pytorch/vgae/model.py
imports: import torch
  import torch.nn
  import torch.nn.functional
  from dgl.nn.pytorch import GraphConv
  from train import device
label_desc: Use image node_id 3 for calling the VGAEModel obj's underlying member method code with example usage: obj.decoder(z) and returns: adj_rec