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https://github.com/vale981/ray
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dd70720578
* bulk rename * deprecation warn * update doc * update fig * line length * rename * make pytest comptaible * fix test * fi sys * rename * wip * fix more * lint * update svg * comments * lint * fix use of batch steps
36 lines
1.2 KiB
Python
36 lines
1.2 KiB
Python
import logging
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import ray
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from ray.rllib.policy.sample_batch import SampleBatch
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from ray.rllib.utils.memory import ray_get_and_free
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logger = logging.getLogger(__name__)
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def collect_samples(agents, rollout_fragment_length, num_envs_per_worker,
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train_batch_size):
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"""Collects at least train_batch_size samples, never discarding any."""
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num_timesteps_so_far = 0
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trajectories = []
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agent_dict = {}
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for agent in agents:
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fut_sample = agent.sample.remote()
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agent_dict[fut_sample] = agent
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while agent_dict:
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[fut_sample], _ = ray.wait(list(agent_dict))
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agent = agent_dict.pop(fut_sample)
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next_sample = ray_get_and_free(fut_sample)
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num_timesteps_so_far += next_sample.count
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trajectories.append(next_sample)
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# Only launch more tasks if we don't already have enough pending
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pending = len(
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agent_dict) * rollout_fragment_length * num_envs_per_worker
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if num_timesteps_so_far + pending < train_batch_size:
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fut_sample2 = agent.sample.remote()
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agent_dict[fut_sample2] = agent
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return SampleBatch.concat_samples(trajectories)
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