code: def rfunc(self, nodes):
      ci = nodes.mailbox["ci"].unsqueeze(2)
      newh = (nodes.mailbox["m"] * ci).sum(1) * nodes.data[
          "cj"
      ].unsqueeze(1)
      return {"h": newh}
  
file_path: dgl/benchmarks/benchmarks/model_speed/bench_gcn_udf.py
imports: import time
  import dgl
  import torch
  import torch.nn
  import torch.nn.functional
  from ..None import utils
label_desc: Use image node_id 4 for calling the GraphConv obj's underlying member method code with example usage: obj.rfunc(nodes) and returns: dict