code: def is_valid_check_preallocated_output_param(param):
      if not isinstance(param, string_types):
          return False
      valid = [
          "initial",
          "previous",
          "c_contiguous",
          "f_contiguous",
          "strided",
          "wrong_size",
          "ALL",
          "",
      ]
      for p in param.split(":"):
          if p not in valid:
              return False
      return True
  
imports: from __future__ import absolute_import, print_function, division
  import errno
  import os
  import sys
  import logging
  import numpy
  import platform
  import textwrap
  import re
  import socket
  import struct
  import warnings
  from six import string_types
  import theano
  from theano.configparser import AddConfigVar, BoolParam, ConfigParam, EnumStr, FloatParam, IntParam, StrParam, TheanoConfigParser, THEANO_FLAGS_DICT
  from theano.misc.cpucount import cpuCount
  from theano.misc.windows import call_subprocess_Popen, output_subprocess_Popen
  from theano.compat import maybe_add_to_os_environ_pathlist
label_desc: Use image node_id 17 for calling a global function with example usage: is_valid_check_preallocated_output_param(param) and returns: True, False, False