change set to list in tiger to tame random.sample in python 3.11

Author: zkytony

CHANGELOG.rst

@@ -11,6 +11,7 @@ Version 1.3.3 (07/25/2023)
 * Fix :code:`s -> sp` in :py:mod:`~pomdp_py.algorithms.value_iteration.ValueIteration` (`pomdp-py#20 <https://github.com/h2r/pomdp-py/issues/20>`_)
 * Allow updating rollout policy for :py:mod:`~pomdp_py.algorithms.po_uct.POUCT` and :py:mod:`~pomdp_py.algorithms.pomcp.POMCP`
 * Fix in :code:`setup.py` so that wheel builds properly.
+* Change set to list in :code:`pomdp_problems.tiger.tiger_problem.py` to tame error regarding :code:`random.sample` in Python 3.11.
 * Minor bug fixes and documentation.
 
 

pomdp_problems/tiger/cythonize/tiger_problem.pyx

@@ -44,11 +44,11 @@ import numpy as np
 import sys
 
 def build_states(strings):
-    return {TigerState(s) for s in strings}
+    return [TigerState(s) for s in strings]
 def build_actions(strings):
-    return {TigerAction(s) for s in strings}
+    return [TigerAction(s) for s in strings]
 def build_observations(strings):
-    return {TigerObservation(s) for s in strings}
+    return [TigerObservation(s) for s in strings]
 
 cdef class TigerState(State):
     cdef public str name

pomdp_problems/tiger/tiger_problem.py

@@ -168,8 +168,8 @@ def sample(self, state, action, next_state):
 class PolicyModel(pomdp_py.RolloutPolicy):
     """A simple policy model with uniform prior over a
        small, finite action space"""
-    ACTIONS = {TigerAction(s)
-              for s in {"open-left", "open-right", "listen"}}
+    ACTIONS = [TigerAction(s)
+              for s in {"open-left", "open-right", "listen"}]
 
     def sample(self, state):
         return random.sample(self.get_all_actions(), 1)[0]