human
Solve the following python programming problem given the following code:
# Create a simple helper function to render a frame from the current state of
# the environment.
if environment_library == 'dm_control':
  def render(env):
    return env.physics.render(camera_id=0)
elif environment_library == 'gym':
  def render(env):
    return env.environment.render(mode='rgb_array')
else:
  raise ValueError(
      "Unknown environment library: {};".format(environment_library) +
      "choose among ['dm_control', 'gym'].")

def display_video(frames, filename='temp.mp4'):
  """Save and display video."""

  # Write video
  with imageio.get_writer(filename, fps=60) as video:
    for frame in frames:
      video.append_data(frame)

  # Read video and display the video
  video = open(filename, 'rb').read()
  b64_video = base64.b64encode(video)
  video_tag = ('<video  width="320" height="240" controls alt="test" '
               'src="data:video/mp4;base64,{0}">').format(b64_video.decode())

  return IPython.display.HTML(video_tag)
Given the above code, generate some markdown instructions for it.
assistant
#Here is the Python program you requested.

Visualize an evaluation loop
Helper functions for rendering and vizualization