code: def forward(self, x, edge_index):
      messages = self.message_aggr(x, edge_index)
      new_x = self.node_update(x, messages)
      return new_x
  
imports: import torch
  import torch.nn
  from torch_scatter import scatter
  from torch_geometric.nn import global_add_pool, global_mean_pool, global_max_pool, GINConv
  from dig.auggraph.method.GraphAug.constants import *
label_desc: Use image node_id 6 for calling the GEMBConv obj's underlying member method code with example usage: obj.forward(x, edge_index) and returns: new_x