code: def message(self, x_j, edge_type: int):
      return self.rel_lins[edge_type](x_j)
  
imports: from copy import copy
  import argparse
  from tqdm.auto import tqdm
  import torch
  import torch.nn.functional
  from torch.nn import ModuleList, Linear, ParameterDict, Parameter
  from torch_sparse import SparseTensor
  from torch_geometric.utils import to_undirected
  from torch_geometric.data import NeighborSampler
  from torch_geometric.utils.hetero import group_hetero_graph
  from torch_geometric.nn import MessagePassing
  from ogb.nodeproppred import PygNodePropPredDataset, Evaluator
  from logger import Logger
label_desc: Use image node_id 4 for calling the RGCNConv obj's underlying member method code with example usage: obj.message(x_j, edge_type) and returns: self