code: def valid_identifier(name):
      return bool(_VALID_IDENTIFIER.match(name))
  
imports: import re
  from tensorflow.python import tf2
  from tensorflow.python.framework import composite_tensor
  from tensorflow.python.framework import ops
  from tensorflow.python.ops import variables
  from tensorflow.python.trackable import autotrackable
  from tensorflow.python.util import nest
  from tensorflow.python.util import tf_decorator
  from tensorflow.python.util.tf_export import tf_export
label_desc: Use image node_id 5 for calling a global function with example usage: valid_identifier(name) and returns: bool