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[RLlib] Issue 17706: AttributeError: 'numpy.ndarray' object has no attribute 'items'" on certain turn-based MultiAgentEnvs with Dict obs space. #17735

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Aug 11, 2021
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[RLlib] Issue 17706: AttributeError: 'numpy.ndarray' object has no attribute 'items'" on certain turn-based MultiAgentEnvs with Dict obs space. #17735

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4 changes: 3 additions & 1 deletion rllib/evaluation/sampler.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@
import queue
import threading
import time
import tree # pip install dm_tree
from typing import Any, Callable, Dict, List, Iterable, Optional, Set, Tuple,\
Type, TYPE_CHECKING, Union

Expand Down Expand Up @@ -778,7 +779,8 @@ def _process_observations(
obs_sp = worker.policy_map[episode.policy_for(
ag_id)].observation_space
obs_sp = getattr(obs_sp, "original_space", obs_sp)
all_agents_obs[ag_id] = np.zeros_like(obs_sp.sample())
all_agents_obs[ag_id] = tree.map_structure(
np.zeros_like, obs_sp.sample())
else:
hit_horizon = False
all_agents_done = False
Expand Down