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[RLlib] Issue 7401: In eval mode (if evaluation_episodes > 0), agent hangs if Env does not terminate. (#7448)

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* Fix.

* Rollback.

* Fix issue 7421.

* Fix.
This commit is contained in:
Eric Liang
2020-03-04 12:58:34 -08:00
committed by GitHub
parent c38224d8e5
commit fddeb6809c
4 changed files with 17 additions and 22 deletions
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rllib/evaluation/sampler.py
+12 -7
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@@ -266,7 +266,7 @@ def _env_runner(base_env, extra_batch_callback, policies, policy_mapping_fn,
if not horizon:
horizon = (base_env.get_unwrapped()[0].spec.max_episode_steps)
except Exception:
logger.debug("no episode horizon specified, assuming inf")
logger.debug("No episode horizon specified, assuming inf.")
if not horizon:
horizon = float("inf")
@@ -354,6 +354,8 @@ def _process_observations(base_env, policies, batch_builder_pool,
active_envs = set()
to_eval = defaultdict(list)
outputs = []
large_batch_threshold = max(1000, unroll_length * 10) if \
unroll_length != float("inf") else 5000
# For each environment
for env_id, agent_obs in unfiltered_obs.items():
@@ -364,18 +366,21 @@ def _process_observations(base_env, policies, batch_builder_pool,
episode.batch_builder.count += 1
episode._add_agent_rewards(rewards[env_id])
if (episode.batch_builder.total() > max(1000, unroll_length * 10)
if (episode.batch_builder.total() > large_batch_threshold
and log_once("large_batch_warning")):
logger.warning(
"More than {} observations for {} env steps ".format(
episode.batch_builder.total(),
episode.batch_builder.count) + "are buffered in "
"the sampler. If this is more than you expected, check that "
"that you set a horizon on your environment correctly. Note "
"that in multi-agent environments, `sample_batch_size` sets "
"that you set a horizon on your environment correctly and that"
" it terminates at some point. "
"Note: In multi-agent environments, `sample_batch_size` sets "
"the batch size based on environment steps, not the steps of "
"individual agents, which can result in unexpectedly large "
"batches.")
"batches. Also, you may be in evaluation waiting for your Env "
"to terminate (batch_mode=`complete_episodes`). Make sure it "
"does at some point.")
# Check episode termination conditions
if dones[env_id]["__all__"] or episode.length >= horizon:
@@ -398,7 +403,7 @@ def _process_observations(base_env, policies, batch_builder_pool,
all_done = False
active_envs.add(env_id)
# For each agent in the environment
# For each agent in the environment.
for agent_id, raw_obs in agent_obs.items():
policy_id = episode.policy_for(agent_id)
prep_obs = _get_or_raise(preprocessors,
@@ -451,7 +456,7 @@ def _process_observations(base_env, policies, batch_builder_pool,
# Cut the batch if we're not packing multiple episodes into one,
# or if we've exceeded the requested batch size.
if episode.batch_builder.has_pending_data():
if episode.batch_builder.has_pending_agent_data():
if dones[env_id]["__all__"] and not no_done_at_end:
episode.batch_builder.check_missing_dones()
if (all_done and not pack) or \