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55 lines
1.9 KiB
Python
55 lines
1.9 KiB
Python
from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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from ray.rllib.agents.ddpg.ddpg import DDPGTrainer, \
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DEFAULT_CONFIG as DDPG_CONFIG
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from ray.rllib.utils.annotations import override
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from ray.rllib.utils import merge_dicts
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APEX_DDPG_DEFAULT_CONFIG = merge_dicts(
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DDPG_CONFIG, # see also the options in ddpg.py, which are also supported
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{
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"optimizer_class": "AsyncReplayOptimizer",
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"optimizer": merge_dicts(
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DDPG_CONFIG["optimizer"], {
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"max_weight_sync_delay": 400,
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"num_replay_buffer_shards": 4,
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"debug": False
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}),
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"n_step": 3,
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"num_gpus": 0,
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"num_workers": 32,
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"buffer_size": 2000000,
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"learning_starts": 50000,
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"train_batch_size": 512,
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"sample_batch_size": 50,
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"target_network_update_freq": 500000,
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"timesteps_per_iteration": 25000,
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"per_worker_exploration": True,
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"worker_side_prioritization": True,
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"min_iter_time_s": 30,
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},
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)
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class ApexDDPGTrainer(DDPGTrainer):
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"""DDPG variant that uses the Ape-X distributed policy optimizer.
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By default, this is configured for a large single node (32 cores). For
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running in a large cluster, increase the `num_workers` config var.
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"""
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_name = "APEX_DDPG"
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_default_config = APEX_DDPG_DEFAULT_CONFIG
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@override(DDPGTrainer)
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def update_target_if_needed(self):
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# Ape-X updates based on num steps trained, not sampled
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if self.optimizer.num_steps_trained - self.last_target_update_ts > \
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self.config["target_network_update_freq"]:
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self.workers.local_worker().foreach_trainable_policy(
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lambda p, _: p.update_target())
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self.last_target_update_ts = self.optimizer.num_steps_trained
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self.num_target_updates += 1
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