Dynamic action spaces does not correctly handle operators_as_actions=True for stochastic domains

[RushangKaria]

Description

Currently, using dynamic_action_space=True in conjunction with operators_as_actions=True for a domain does not correctly work for stochastic domains such as Triangle Tireworld in their original IPPC variants i.e. without the custom pddlgym mods.

The issue is the following line of code (

pddlgym/pddlgym/core.py

Line 334 in ea2945d

if dynamic_action_space:

)

        if dynamic_action_space:
            if self.domain.operators_as_actions and self._domain_is_strips:
                self._action_space = LiteralActionSpace(
                    self.domain, self.action_predicates,
                    type_hierarchy=self.domain.type_hierarchy,
                    type_to_parent_types=self.domain.type_to_parent_types)

LiteralActionSpace uses FastDownward (FD) for initializing the action space and thus does not support stochastic domains.
The check should also check if sefl.domain.is_probabilistic is set to False.

Error

The error is usually parser errors such as undefined predicate (probabilistic which is understandable since FD tries to parse those keywords as predicates.