code: def _gpu_available(tf):
      if tf.test.is_gpu_available():
          return "yes"
      if tf.test.is_built_with_cuda():
          return _warn(
              "NO (CUDA support is enabled but GPU is not available)"
          )
      return "no"
  
file_path: guildai/guild/commands/tensorflow_check_main.py
imports: import os
  import re
  import subprocess
  import sys
  import click
label_desc: Use image node_id 6 for calling a global function with example usage: _gpu_available(tf) and returns: str, str, _warn