class_docstr: A mutable module is a module that supports variable input data.
  
  Parameters
  ----------
  symbol : Symbol
  data_names : list of str
  label_names : list of str
  logger : Logger
  context : Context or list of Context
  work_load_list : list of number
  max_data_shapes : list of (name, shape) tuple, designating inputs whose shape vary
  max_label_shapes : list of (name, shape) tuple, designating inputs whose shape vary
  fixed_param_prefix : list of str, indicating fixed parameters
code: def output_names(self):
      return self._symbol.list_outputs()
  
imports: import logging
  from mxnet import context
  from mxnet.initializer import Uniform
  from mxnet.module.base_module import BaseModule
  from mxnet.module.module import Module
label_desc: Use image node_id 4 for calling the MutableModule obj's underlying member method code with example usage: obj.output_names() and returns: self