In cases when reviewing the statistics and event logs provided by the event system does not provide enough insight, rendering the environment state in a particular time step is helpful.
Maze supports two rendering modes:
Rendering online during the rollout. This is possible simply using the sequential rollout runner for a rollout, and setting the rendering flag to true using the following overrides:
Rendering offline, in a Jupyter notebook, from trajectory data collected earlier. For environments which provide a Maze-compatible render, rollouts can be rendered and browsed retroactively. Review collecting and visualizing rollouts for more details. (Unfortunately, this mode is not yet supported for ordinary Gym envs – unless a custom Maze-compatible renderer is provided.)