ray.rllib.algorithms.algorithm_config.AlgorithmConfig.get_rollout_fragment_length

AlgorithmConfig.get_rollout_fragment_length(worker_index: int = 0) → int

Automatically infers a proper rollout_fragment_length setting if “auto”.

Uses the simple formula: rollout_fragment_length = total_train_batch_size / (num_envs_per_env_runner * num_env_runners)

If result is a fraction AND worker_index is provided, makes those workers add additional timesteps, such that the overall batch size (across the workers) adds up to exactly the total_train_batch_size.

Returns:

The user-provided rollout_fragment_length or a computed one (if user provided value is “auto”), making sure total_train_batch_size is reached exactly in each iteration.