code: def load_json(json_str):
      
      if not isinstance(json_str, string_types):
          raise TypeError('fname required to be string')
      handle = SymbolHandle()
      check_call(_LIB.MXSymbolCreateFromJSON(c_str(json_str), ctypes.byref(handle)))
      return Symbol(handle)
docs: Loads symbol from json string.
  
      Parameters
      ----------
      json_str : str
          A JSON string.
  
      Returns
      -------
      sym : Symbol
          The loaded symbol.
  
      See Also
      --------
      Symbol.tojson : Used to save symbol into json string.