code: def set_tf_nccl_version(environ_cp):
      """Set TF_NCCL_VERSION."""
      if not is_linux():
          raise ValueError(
              "Currently NCCL is only supported on Linux platform."
          )
  
      if "TF_NCCL_VERSION" in environ_cp:
          return
  
      ask_nccl_version = (
          "Please specify the locally installed NCCL version you want to use. "
          "[Leave empty to use http://github.com/nvidia/nccl]: "
      )
      tf_nccl_version = get_from_env_or_user_or_default(
          environ_cp, "TF_NCCL_VERSION", ask_nccl_version, ""
      )
      environ_cp["TF_NCCL_VERSION"] = tf_nccl_version
  
imports: import argparse
  import errno
  import glob
  import json
  import os
  import platform
  import re
  import subprocess
  import sys
label_desc: Use image node_id 40 for calling a global function with example usage: set_tf_nccl_version(environ_cp) without return types