code: def session(self):
      if self._session is None:
          with self._graph.as_default():
              self._session = tf.compat.v1.Session()
      return self._session
  
file_path: tf-encrypted/primitives/tf_encrypted/test/execution_context.py
imports: import contextlib
  import tensorflow
label_desc: Use image node_id 3 for calling the GraphExecutionContext obj's underlying member method code with example usage: obj.session() and returns: self