class_docstr: This implement Message for graph.recv.
  
  Args:
  
      msg: A dictionary provided by send function.
  
      segment_ids: The id that the message belongs to.
class_docstr_tok: ["This","implement","Message","for","graph.recv",".","Args",":","msg",":","A","dictionary","provided","by","send","function",".","segment_ids",":","The","id","that","the","message","belongs","to","."]
code: def __getitem__(self, key):
      return self._msg[key]
  
file_path: PGL/pgl/message.py
imports: import paddle
  import pgl.math
label_desc: Use image node_id 9 for calling the Message obj's underlying member method code with example usage: obj.__getitem__(key) and returns: self