code: def message_func(self, edges):
      return {
          "e": edges.data["e"],
          "vector_field": edges.data["vector_field"],
      }
  
imports: import argparse
  import random
  import dgl
  import numpy
  import torch
  import torch.nn
  import torch.nn.functional
  import torch.optim
  from dgl.dataloading import GraphDataLoader
  from ogb.graphproppred import Evaluator
  from ogb.graphproppred.mol_encoder import AtomEncoder
  from preprocessing import prepare_dataset
  from torch.utils.data import Dataset
  from tqdm import tqdm
label_desc: Use image node_id 3 for calling the DGNLayer obj's underlying member method code with example usage: obj.message_func(edges) and returns: dict