class_docstr: A driver that takes steps in an environment using a policy.
code: def observers(self):
      return self._observers
  
file_path: agents/tf_agents/drivers/driver.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import abc
  import six
label_desc: Use image node_id 5 for calling the Driver obj's underlying member method code with example usage: obj.observers() and returns: self