concepts.pdsketch.strips.strips_grounded_expression.GSConditionalAssignExpression#

class GSConditionalAssignExpression[source]#

Bases: GSVariableAssignmentExpression

A conditional assignment expression. Note that the inner expression must be a simple assignment expression. Therefore , a conditional assignment expression is represented by a condition, a set of add effects, and a set of delete effects.

Methods

`applicable`(state)	Check if the conditional assignment expression is applicable in the given state.
`apply`(state)	Apply the conditional assignment expression in the given state.
`compile`()	Compile the assignment expression into a function.
`filter_propositions`(propositions[, state])	Filter the given propositions from the expression.
`iter_propositions`()	Iterate over all propositions that are used in this expression.
`relax`()	Delete relaxation of a conditional assignment.

Attributes

`add_effects`	The add effects of the conditional assignment expression.
`del_effects`	The delete effects of the conditional assignment expression.
`condition`	The condition of the conditional assignment expression.
`assignment`	The inner (simple) assignment expression of the conditional assignment expression.
`condition_func`	The compiled condition function.
`assignment_func`	The compiled assignment function.

__init__(condition, assignment)[source]#

Initialize the conditional assignment expression.

Parameters:

condition (GSBoolOutputExpression) – the condition.
assignment (GSSimpleBoolAssignExpression) – the simple assignment expression.

__new__(**kwargs)#

applicable(state)[source]#

Check if the conditional assignment expression is applicable in the given state.

Parameters:: state (SState)
Return type:: bool | GSBoolForwardDiffReturn

apply(state)[source]#

Apply the conditional assignment expression in the given state.

Parameters:: state (SState)
Return type:: SState

compile()[source]#

Compile the assignment expression into a function. By default, the function will return the state with the add and delete effects applied.

Return type:: Callable[[SState], SState]

filter_propositions(propositions, state=None)[source]#

Filter the given propositions from the expression. For conditional assignment expressions, the filtering is done by filtering the inner simple assignment expression and the condition.

Parameters:

propositions (Set[str]) – the propositions that should be kept.
state (SState | None) – the initial state, default to None.

Returns:

the conditional assignment expression after filtering.

Return type:

GSConditionalAssignExpression

iter_propositions()[source]#

Iterate over all propositions that are used in this expression.

Return type:: Iterable[str]

relax()[source]#

Delete relaxation of a conditional assignment. Essentially, it removes all delete effects for the inner simple assignment expression.

Returns:: the delete relaxed conditional assignment expression.
Return type:: GSConditionalAssignExpression

property add_effects: FrozenSet[str]#: The add effects of the conditional assignment expression.

assignment: GSSimpleBoolAssignExpression#: The inner (simple) assignment expression of the conditional assignment expression.

assignment_func: Callable[[SState], SState] | None#: The compiled assignment function.

condition: GSBoolOutputExpression#: The condition of the conditional assignment expression.

condition_func: Callable[[SState], bool | GSBoolForwardDiffReturn] | None#: The compiled condition function.

property del_effects: FrozenSet[str]#: The delete effects of the conditional assignment expression.