mirror of
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Improving DCEC support
- Time based search algorithm - Added new variables ?now and ?next
This commit is contained in:
parent
a747b38233
commit
01883787da
5 changed files with 364 additions and 11 deletions
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@ -4,11 +4,12 @@ import org.rairlab.planner.utils.Visualizer;
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import org.rairlab.shadow.prover.core.Prover;
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import org.rairlab.shadow.prover.core.ccprovers.CognitiveCalculusProver;
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import org.rairlab.shadow.prover.core.proof.Justification;
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import org.rairlab.shadow.prover.representations.formula.BiConditional;
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import org.rairlab.shadow.prover.representations.formula.Formula;
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import org.rairlab.shadow.prover.representations.value.Value;
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import org.rairlab.shadow.prover.representations.value.Variable;
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import org.rairlab.shadow.prover.representations.formula.*;
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import org.rairlab.shadow.prover.representations.value.Constant;
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import org.rairlab.shadow.prover.utils.CollectionUtils;
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import org.rairlab.shadow.prover.utils.Sets;
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@ -16,11 +17,14 @@ import org.apache.commons.lang3.tuple.Pair;
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import org.apache.commons.lang3.tuple.ImmutablePair;
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import org.apache.commons.lang3.tuple.Triple;
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import java.util.ArrayList;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Map;
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import java.util.Optional;
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import java.util.Set;
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import java.util.concurrent.*;
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import java.util.stream.Collectors;
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/**
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* Created by naveensundarg on 1/13/17.
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@ -155,10 +159,37 @@ public class Operations {
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return Optional.of(ans.get().getRight());
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}
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public static Value getTime(int time) {
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return new Constant("t" + time);
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}
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public static Optional<Set<Pair<State, Action>>> apply(Set<Formula> background, Action action, State state) {
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public static int getTime(Value time) {
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String s = time.getName();
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String[] ss = s.split("t");
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if (ss.length != 2) {
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return -1;
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}
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try {
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int t = Integer.parseInt(ss[1]);
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return t + 1;
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} catch (NumberFormatException e) {
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return -1;
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}
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}
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// Get resulting states from cache if computed before
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// Take a time value, get the integer number out and
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// increment by 1
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public static Value incrementTime(Value time) {
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int t = getTime(time);
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if (t < 0) {
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return new Constant("ERROR");
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}
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return new Constant("t" + (t + 1));
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}
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public static Optional<Set<Pair<State, Action>>> apply(Set<Formula> background, Action action, State state, Value t) {
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// // Get resulting states from cache if computed before
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if(applyCache.containsKey(Triple.of(background, action, state))){
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Optional<Set<Pair<State, Action>>> ans = applyCache.get(Triple.of(background, action, state));
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if(ans.isPresent()){
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@ -169,7 +200,22 @@ public class Operations {
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// Ask theorem prover for witnesses that satisfy the precondition
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Set<Formula> givens = Sets.union(background, state.getFormulae());
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Optional<Set<Map<Variable, Value>>> bindingsOpt = proveAndGetBindingsCached(givens, action.getPrecondition(), action.openVars());
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// TODO: Have all this ?now and (next ?now) code within Action.java
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// Replace ?now with current time within preconditions
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Formula precondition = action.getPrecondition();
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Value now = new Variable("?now");
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precondition = replaceValue(precondition, now, t);
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// We already replaced the ?now
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List<Variable> openVars = action.openVars()
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.stream()
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.filter(v -> !v.getName().equals("?now"))
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.collect(Collectors.toList());
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// TODO: Can likely more intelligently cache considering time...
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Optional<Set<Map<Variable, Value>>> bindingsOpt = proveAndGetBindingsCached(givens, precondition, openVars);
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// If not witnesses found, return nothing
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if (!bindingsOpt.isPresent()) {
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@ -191,9 +237,19 @@ public class Operations {
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// newState = (oldState - Deletions(a)) U Additions(a)
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Action groundedAction = action.instantiate(binding);
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Set<Formula> additions = groundedAction.getAdditions();
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Set<Formula> deletions = groundedAction.getDeletions();
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// Replace (next ?now) with appropriate time
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Value nextTime = incrementTime(t);
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Value nextTimeVar = new Variable("?next");
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additions = replaceValue(additions, nextTimeVar, nextTime);
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deletions = replaceValue(deletions, nextTimeVar, nextTime);
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State newState = State.initializeWith(Sets.union(
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Sets.difference(state.getFormulae(), groundedAction.getDeletions()),
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groundedAction.getAdditions()
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Sets.difference(state.getFormulae(), deletions),
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additions
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));
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// If the state progresses, record it as a possible next state
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@ -203,10 +259,102 @@ public class Operations {
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}
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applyCache.put(Triple.of(background, action, state), Optional.of(nextStates));
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return Optional.of(nextStates);
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}
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public static State replaceValue(State s, Value r, Value t) {
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Set<Formula> newFormulae = replaceValue(s.getFormulae(), r, t);
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return State.initializeWith(newFormulae);
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}
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public static Set<Formula> replaceValue(Set<Formula> s, Value r, Value t) {
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Set<Formula> newFormulae = new HashSet<Formula>();
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for (Formula f : s) {
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newFormulae.add(replaceValue(f, r, t));
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}
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return newFormulae;
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}
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public static Value replaceValue(Value v, Value r, Value t) {
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if (v.getName().equals(r.getName())) {
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return t;
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}
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return v;
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}
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// Everywhere where there's a ?now replace with value t
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public static Formula replaceValue(Formula f, Value r, Value t) {
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// Base Cases:
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// Bottom of Formula graph wouldn't have any time points under it
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if (f instanceof Predicate || f instanceof Atom) {
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return f;
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}
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// Check if these quantifiers contain our bound varialbe
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if (f instanceof UnaryModalFormula) {
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UnaryModalFormula uf = (UnaryModalFormula) f;
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Value agent = uf.getAgent();
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Value time = uf.getTime();
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Value newTime = replaceValue(time, r, t);
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Formula uf_sub = uf.getFormula();
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Formula new_uf_sub = replaceValue(uf_sub, r, t);
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if (f instanceof Belief) {
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return new Belief(agent, newTime, new_uf_sub);
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} else if (f instanceof Intends) {
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return new Intends(agent, newTime, new_uf_sub);
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} else if (f instanceof Knowledge) {
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return new Knowledge(agent, newTime, new_uf_sub);
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}
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// Assumes Perception
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if (! (f instanceof Perception)) {
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System.out.println("[fixTimepoints:Operations.java] Doesn't account for new modal operator");
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}
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return new Perception(agent, newTime, new_uf_sub);
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}
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// Recusive Case: Iterate over each subformula and replace
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if (f instanceof Not) {
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Formula subFormula = ((Not) f).getArgument();
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return new Not(replaceValue(subFormula, r, t));
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} else if (f instanceof Universal) {
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Formula subFormula = ((Universal) f).getArgument();
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return new Universal(((Universal) f).vars(), replaceValue(subFormula, r, t));
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} else if (f instanceof Existential) {
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Formula subFormula = ((Existential) f).getArgument();
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return new Universal(((Existential) f).vars(), replaceValue(subFormula, r, t));
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} else if (f instanceof Implication) {
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Formula antecedant = ((Implication) f).getAntecedent();
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Formula consequent = ((Implication) f).getConsequent();
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return new Implication(replaceValue(antecedant, r, t), replaceValue(consequent, r, t));
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} else if (f instanceof BiConditional) {
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Formula left = ((BiConditional) f).getLeft();
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Formula right = ((BiConditional) f).getRight();
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return new BiConditional(replaceValue(left, r, t), replaceValue(right, r, t));
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}
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List<Formula> subFormulae = f.getArgs();
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List<Formula> newArguments = new ArrayList<Formula>();
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for (Formula sf : subFormulae) {
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newArguments.add(replaceValue(sf, r, t));
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}
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if (f instanceof And) {
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return new And(newArguments);
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}
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// Assume Or
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if (! (f instanceof Or)) {
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System.out.println("[fixTimepoints:Operations.java] Not accounting for formula type in recursive case");
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}
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return new Or(newArguments);
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}
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public static boolean equivalent(Set<Formula> background, Formula f1, Formula f2) {
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if (!DEEP_EQUIVALENCE) {
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return f1.equals(f2);
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@ -6,6 +6,7 @@ import org.rairlab.planner.State;
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import org.rairlab.planner.Action;
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import org.rairlab.planner.Plan;
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import org.rairlab.planner.Operations;
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import org.rairlab.shadow.prover.representations.value.Value;
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import java.util.*;
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import java.util.function.Function;
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@ -67,6 +68,10 @@ public class AStarPlanner {
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comparator.setValue(searchStart, 0);
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search.add(searchStart);
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// For debugging...
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Map<State, List<Action>> seq = new HashMap<State, List<Action>>();
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seq.put(start, new ArrayList<Action>());
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// Current set of plans
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Set<Plan> plansFound = new HashSet<Plan>();
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@ -81,7 +86,11 @@ public class AStarPlanner {
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State lastState = currentSearch.getLeft();
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List<Action> previous_actions = currentSearch.getRight();
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// System.out.println("Considering state with heuristic: " + comparator.getValue(currentSearch));
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System.out.println("--------------------");
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System.out.println("Considering state with heuristic: " + comparator.getValue(currentSearch));
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System.out.println("Current Plan: " + seq.get(lastState).toString());
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System.out.println("Current State: " + lastState.toString());
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System.out.println("--------------------");
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// Exit loop if we've passed the depth limit
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int currentDepth = previous_actions.size();
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@ -105,7 +114,10 @@ public class AStarPlanner {
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// Apply the action to the state and add to the search space
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for (Action action : nonTrivialActions) {
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Optional<Set<Pair<State, Action>>> optNextStateActionPairs = Operations.apply(background, action, lastState);
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// System.out.println("Considering action: " + action.getName());
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Value currentTime = Operations.getTime(previous_actions.size());
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Optional<Set<Pair<State, Action>>> optNextStateActionPairs = Operations.apply(background, action, lastState, currentTime);
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// Ignore actions that aren't applicable
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if (optNextStateActionPairs.isEmpty()) {
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@ -137,6 +149,10 @@ public class AStarPlanner {
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int heuristicValue = heuristic.apply(nextState);
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comparator.setValue(futureSearch, planCost + heuristicValue);
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search.add(futureSearch);
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// For debugging...
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seq.put(nextState, next_actions);
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}
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}
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}
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@ -46,7 +46,7 @@ public final class Runner {
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}
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AStarPlanner astarplanner = new AStarPlanner();
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astarplanner.setK(2);
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astarplanner.setK(1);
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for (PlanningProblem planningProblem : planningProblemList) {
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@ -0,0 +1,108 @@
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; Original problem from Joerg Hoffmann and Ronen Brafman
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{:name "Block-Conformant-Tiny"
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:background [
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; Setting object types
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(block b1)
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(block b2)
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; Unique name axioms
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(not (= b1 b2))
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; Block World Axioms
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; Blocks are never on themselves
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(forall [x] (not (on x x)))
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; on is not symmetric
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(forall [x y] (if (on x y) (not (on y x))))
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; Any block on a table isn't on top of another block
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(forall [x y] (if (on-table x) (not (on x y))))
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; Any block that is cleared does not have another block on top of it
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(forall [x y] (if (clear x) (not (on y x))))
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; NOTE: Slow if we use complicated definitions
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;; ; A block is on the table if it isn't on top of any other block
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;; (forall [x] (iff (on-table x) (forall [y] (not (on x y)))))
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;; ; A block is cleared if there is no other block on top of it
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;; (forall [x] (iff (clear x) (forall [y] (not (on y x)))))
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]
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:actions [
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(define-action move-bstack-to-t [?b ?b1] {
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:preconditions [
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; Type restriction
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(block ?b)
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(block ?b1)
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; Arguments unique
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(not (= ?b ?b1))
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; Preconditions
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;; (not (on-table ?b))
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]
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; TODO: Think hard about the effect
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;; :effect (and (when (on ?b ?bl)
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;; (and (not (on ?b ?bl)) (on-table ?b) (clear ?bl)))))
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:additions [
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; The following creates a contradiction because
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; (on-table ?b) -> (not (on ?b ?b1)) and
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; we can't have P -> \neg P
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;; (if (on ?b ?b1) (and (on-table ?b) (clear ?b1)))
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]
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:deletions [ ]
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})
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(define-action move-t-to-b [?bm ?bt ?t] {
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:preconditions [
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; Type restrictions
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(block ?bm)
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(block ?bt)
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; Arguments unique
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(not (= ?bm ?bt))
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; Primary preconditions
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(clear ?bm ?t)
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(clear ?bt ?t)
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(on-table ?bm ?t)
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]
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:additions [
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(on ?bm ?bt (s ?t))
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(not (clear ?bt (s ?t)))
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(not (on-table ?bm (s ?t)))
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]
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:deletions [
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;; (not (on ?bm ?bt))
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;; (clear ?bt)
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;; (on-table ?bm)
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]
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})
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]
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:start [
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; Unknown facts don't need to be stated
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; since we don't assume closed world assumption.
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; Negated predicates in this example is handled by
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; the block world axioms
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(or
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(and
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(on b2 b1 t0)
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(clear b2 t0)
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(on-table b1 t0)
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)
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(and
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(on b1 b2 t0)
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(clear b1 t0)
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(on-table b2 t0)
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)
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)
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]
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:goal [
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(exists [x] (on b2 b1 x))
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]
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}
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@ -0,0 +1,81 @@
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; Original problem from Joerg Hoffmann and Ronen Brafman
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{:name "Block-Conformant-Tiny"
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:background [
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; Setting object types
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(Believes! a t0 (block b1))
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(Believes! a t0 (block b2))
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; Unique name axioms
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(Believes! a t0 (not (= b1 b2)))
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; Block World Axioms
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; Blocks are never on themselves
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(Believes! a t0 (forall [x] (not (on x x))))
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; on is not symmetric
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(Believes! a t0 (forall [x y] (if (on x y) (not (on y x)))))
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; Any block on a table isn't on top of another block
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(Believes! a t0 (forall [x y] (if (on-table x) (not (on x y)))))
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; Any block that is cleared does not have another block on top of it
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(Believes! a t0 (forall [x y] (if (clear x) (not (on y x)))))
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]
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:actions [
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(define-action move-t-to-b [?bm ?bt] {
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:preconditions [
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(Believes! a ?now (and
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; Type Restrictions
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(block ?bm)
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(block ?bt)
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; Arguments Unique
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(not (= ?bm ?bt))
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; Primary preconditions
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(clear ?bm)
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(clear ?bt)
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(on-table ?bm)
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))
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; NOTE: QA Algorithm is very barebones,
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; currently does not support beliefs under
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; binary operations. Example:
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;; (and
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;; (Believes! a t0 (block ?bm))
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;; (Believes! a t0 (block ?bt))
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;; )
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]
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:additions [
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; ShadowProver uses string comparisons to determine
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; ordering on time points.
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; Spectra currently hacks around this by replacing
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; ?next where the constant
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; that represents ?now + 1.
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; ShadowProver Limitation: Cannot go beyond 10 time points
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(Believes! a ?next (on ?bm ?bt))
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; These below shouldn't be needed but left for posterity
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;; (Believes! a ?next (not (clear ?bt)))
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;; (Believes! a ?next (not (on-table ?bm)))
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]
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:deletions [ ]
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})
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]
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:start [
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; Unknown facts don't need to be stated
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; since we don't assume closed world assumption.
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||||
; Negated predicates in this example is handled by
|
||||
; the block world axioms
|
||||
|
||||
(Believes! a t0 (on-table b2))
|
||||
(Believes! a t0 (on-table b1))
|
||||
(Believes! a t0 (clear b1))
|
||||
(Believes! a t0 (clear b2))
|
||||
]
|
||||
:goal [
|
||||
;; (Believes! a t0 (clear ?bm))
|
||||
; Try a there exists at some point
|
||||
(exists [t] (Believes! a t (on b1 b2)))
|
||||
]
|
||||
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue