code: def forward(self, x, edge_index):
      return self.conv_mu(x, edge_index), self.conv_logstd(
          x, edge_index
      )
  
imports: import argparse
  import os.path
  import time
  import torch
  import torch_geometric.transforms
  from torch_geometric.datasets import Planetoid
  from torch_geometric.nn import GAE, VGAE, GCNConv
label_desc: Use image node_id 2 for calling the VariationalLinearEncoder obj's underlying member method code with example usage: obj.forward(x, edge_index) and returns: self,  self