code: def message_func(self, edges):
      return {"h": edges.src["h"], "c": edges.src["c"]}
  
imports: import itertools
  import time
  import dgl
  import networkx
  import numpy
  import torch
  import torch.nn
  import torch.nn.functional
label_desc: Use image node_id 2 for calling the ChildSumTreeLSTMCell obj's underlying member method code with example usage: obj.message_func(edges) and returns: dict