code: def determine_prefix(user_agent=""):
      """Placeholder docstring"""
      prefix = "AWS-SageMaker-Python-SDK/{}".format(SDK_VERSION)
  
      if PYTHON_VERSION not in user_agent:
          prefix = "{} {}".format(prefix, PYTHON_VERSION)
  
      if OS_NAME_VERSION not in user_agent:
          prefix = "{} {}".format(prefix, OS_NAME_VERSION)
  
      try:
          with open(
              "/etc/opt/ml/sagemaker-notebook-instance-version.txt"
          ) as sagemaker_nbi_file:
              prefix = "{} AWS-SageMaker-Notebook-Instance/{}".format(
                  prefix, sagemaker_nbi_file.read().strip()
              )
      except IOError:
          # This file isn't expected to always exist, and we DO want to silently ignore failures.
          pass
  
      return prefix
  
imports: from __future__ import absolute_import
  import platform
  import sys
  import importlib_metadata
label_desc: Use image node_id 1 for calling a global function with example usage: determine_prefix(user_agent) and returns: prefix