class_docstr: Graph executor factory module.
  This is a module of graph executor factory
  
  Attributes
  ----------
  ir_mod : :py:class:`~tvm.IRModule`
      The IR module to build.
  target : tvm.Target
      The Target used to build this module.
  executor : tvm.relay.backend.Executor
      Internal representation of the Executor
  graph_json_str : the json graph to be deployed in json format output by graph compiler.
      The graph can contain operator(tvm_op) that points to the name of
      PackedFunc in the libmod.
  libmod : tvm.Module
      The module of the corresponding function
  libmod_name: str
      The name of module
  params : dict of str to NDArray
      The parameters of module
  function_metadata : Map of String to FunctionInfo
      This holds a map function names to their information
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code: def get_devices(self):
      return []
  
imports: from abc import abstractmethod
  import warnings
  from ..._ffi.base import string_types
  from ..._ffi.registry import get_global_func
  from ...runtime import ndarray
label_desc: Use image node_id 3 for calling the GraphExecutorFactoryModule obj's underlying member method code with example usage: obj.get_devices() and returns: list