code: def get_optimized_symbol(executor):
      
      handle = SymbolHandle()
      try:
          check_call(_LIB.MXExecutorGetOptimizedSymbol(executor.handle, ctypes.byref(handle)))
          result = sym.Symbol(handle=handle)
          return result
      except MXNetError:
          logging.error('Error while trying to fetch TRT optimized symbol for graph. Please ensure '
                        'build was compiled with MXNET_USE_TENSORRT enabled.')
          raise
docs: Take an executor's underlying symbol graph and return its generated optimized version.
  
      Parameters
      ----------
      executor :
          An executor for which you want to see an optimized symbol. Getting an optimized symbol
          is useful to compare and verify the work TensorRT has done against a legacy behaviour.
  
      Returns
      -------
      symbol : nnvm::Symbol
          The nnvm symbol optimized.