code: def _is_trainable_variable(obj):
      return _is_variable(obj) and getattr(obj, "trainable", False)
  
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 2 for calling a global function with example usage: _is_trainable_variable(obj) and returns: unknown