code: def get_num_gpus():
      """Returns the number of GPUs visible on the current node.
  
      Currently only implemented for NVIDIA GPUs.
      """
      return _get_num_nvidia_gpus()
  
imports: import os
  import re
  import subprocess
  from tensorflow.python.distribute.cluster_resolver.cluster_resolver import ClusterResolver
  from tensorflow.python.distribute.cluster_resolver.cluster_resolver import format_master_url
  from tensorflow.python.training.server_lib import ClusterSpec
  from tensorflow.python.util.tf_export import tf_export
label_desc: Use image node_id 6 for calling a global function with example usage: get_num_gpus() and returns: _get_num_nvidia_gpus