code: def generate_demonstration(self):
      episode_index = 0
      while True:
          episode = self.generate_episode(
              self._demonstration_episode_type,
              episode_index,
              self._demonstration_episode_length,
          )
          for x in episode:
              yield x
          episode_index += 1
  
file_path: acme/acme/agents/jax/lfd/lfd_adder_test.py
imports: import collections
  from acme import adders
  from acme import types
  from acme.agents.jax.lfd import lfd_adder
  import dm_env
  import numpy
  from absl.testing import absltest
label_desc: Use image node_id 3 for calling the LfdAdderTest obj's underlying member method code with example usage: obj.generate_demonstration() without return types