code: def get_msg(self, edges):
      e = torch.cat([edges.src["h"], edges.dst["h"]], -1)
      e = self.msg_layer(e)
      return {"e": e}
  
file_path: dgl/examples/pytorch/rrn/rrn.py
imports: import dgl.function
  import torch
  from torch import nn
label_desc: Use image node_id 3 for calling the RRNLayer obj's underlying member method code with example usage: obj.get_msg(edges) and returns: dict