code: def message(self, x_j, edge_weight):
      return self.lin(x_j)
  
imports: from functools import reduce
  import random
  import networkx
  import numpy
  import torch
  import torch.nn
  import torch.nn.functional
  import torch_geometric.nn
  import torch_geometric.utils
  import utils
label_desc: Use image node_id 3 for calling the SAGEConv obj's underlying member method code with example usage: obj.message(x_j, edge_weight) and returns: self