code: def broadcast_global_variables(root_rank):
      """Broadcasts all global variables from root rank to all other processes.
      Arguments:
          root_rank: Rank of the process from which global variables will be broadcasted
                     to all other processes.
      """
      return _impl.broadcast_global_variables(K, root_rank)
  
file_path: byteps/byteps/keras/__init__.py
imports: import keras
  import keras.backend
  from byteps.tensorflow import init
  from byteps.tensorflow import shutdown
  from byteps.tensorflow import size
  from byteps.tensorflow import local_size
  from byteps.tensorflow import rank
  from byteps.tensorflow import local_rank
  from byteps.tensorflow import Compression
  from byteps.keras import callbacks
  import byteps._keras
label_desc: Use image node_id 2 for calling a global function with example usage: broadcast_global_variables(root_rank) and returns: _impl