class_docstr: EventEmitter subclass used to allow deprecated events to be used with a
  warning message.
class_docstr_tok: ["EventEmitter","subclass","used","to","allow","deprecated","events","to","be","used","with","a","warning","message","."]
code: def _invoke_callback(self, cb, event):
      self._warn(cb)
      return EventEmitter._invoke_callback(self, cb, event)
  
imports: from __future__ import division
  from collections import OrderedDict
  import inspect
  import traceback
  import weakref
  from .logs import logger, _handle_exception
label_desc: Use image node_id 3 for calling the WarningEmitter obj's underlying member method code with example usage: obj._invoke_callback(cb, event) and returns: EventEmitter