class_docstr: Represents a gradient propagation trace.
code: def watched_variables(self):
      return pywrap_tfe.TFE_Py_TapeWatchedVariables(self._tape)
  
file_path: tensorflow/tensorflow/python/eager/tape.py
imports: from tensorflow.python import pywrap_tfe
label_desc: Use image node_id 2 for calling the Tape obj's underlying member method code with example usage: obj.watched_variables() and returns: pywrap_tfe