package aima.test.core.unit.probability.mdp;
import junit.framework.Assert;
import org.junit.Before;
import org.junit.Test;
import aima.core.environment.cellworld.Cell;
import aima.core.environment.cellworld.CellWorld;
import aima.core.environment.cellworld.CellWorldAction;
import aima.core.environment.cellworld.CellWorldFactory;
import aima.core.probability.example.MDPFactory;
import aima.core.probability.mdp.MarkovDecisionProcess;
/**
*
* @author Ciaran O'Reilly
* @author Ravi Mohan
*
*/
public class MarkovDecisionProcessTest {
public static final double DELTA_THRESHOLD = 1e-3;
private CellWorld<Double> cw = null;
private MarkovDecisionProcess<Cell<Double>, CellWorldAction> mdp = null;
@Before
public void setUp() {
cw = CellWorldFactory.createCellWorldForFig17_1();
mdp = MDPFactory.createMDPForFigure17_3(cw);
}
@Test
public void testActions() {
// Ensure all actions can be performed in each cell
// except for the terminal states.
for (Cell<Double> s : cw.getCells()) {
if (4 == s.getX() && (3 == s.getY() || 2 == s.getY())) {
Assert.assertEquals(0, mdp.actions(s).size());
} else {
Assert.assertEquals(5, mdp.actions(s).size());
}
}
}
@Test
public void testMDPTransitionModel() {
Assert.assertEquals(0.8, mdp.transitionProbability(cw.getCellAt(1, 2),
cw.getCellAt(1, 1), CellWorldAction.Up), DELTA_THRESHOLD);
Assert.assertEquals(0.1, mdp.transitionProbability(cw.getCellAt(1, 1),
cw.getCellAt(1, 1), CellWorldAction.Up), DELTA_THRESHOLD);
Assert.assertEquals(0.1, mdp.transitionProbability(cw.getCellAt(2, 1),
cw.getCellAt(1, 1), CellWorldAction.Up), DELTA_THRESHOLD);
Assert.assertEquals(0.0, mdp.transitionProbability(cw.getCellAt(1, 3),
cw.getCellAt(1, 1), CellWorldAction.Up), DELTA_THRESHOLD);
Assert.assertEquals(0.9, mdp.transitionProbability(cw.getCellAt(1, 1),
cw.getCellAt(1, 1), CellWorldAction.Down), DELTA_THRESHOLD);
Assert.assertEquals(0.1, mdp.transitionProbability(cw.getCellAt(2, 1),
cw.getCellAt(1, 1), CellWorldAction.Down), DELTA_THRESHOLD);
Assert.assertEquals(0.0, mdp.transitionProbability(cw.getCellAt(3, 1),
cw.getCellAt(1, 1), CellWorldAction.Down), DELTA_THRESHOLD);
Assert.assertEquals(0.0, mdp.transitionProbability(cw.getCellAt(1, 2),
cw.getCellAt(1, 1), CellWorldAction.Down), DELTA_THRESHOLD);
Assert.assertEquals(0.9, mdp.transitionProbability(cw.getCellAt(1, 1),
cw.getCellAt(1, 1), CellWorldAction.Left), DELTA_THRESHOLD);
Assert.assertEquals(0.0, mdp.transitionProbability(cw.getCellAt(2, 1),
cw.getCellAt(1, 1), CellWorldAction.Left), DELTA_THRESHOLD);
Assert.assertEquals(0.0, mdp.transitionProbability(cw.getCellAt(3, 1),
cw.getCellAt(1, 1), CellWorldAction.Left), DELTA_THRESHOLD);
Assert.assertEquals(0.1, mdp.transitionProbability(cw.getCellAt(1, 2),
cw.getCellAt(1, 1), CellWorldAction.Left), DELTA_THRESHOLD);
Assert.assertEquals(0.8, mdp.transitionProbability(cw.getCellAt(2, 1),
cw.getCellAt(1, 1), CellWorldAction.Right), DELTA_THRESHOLD);
Assert.assertEquals(0.1, mdp.transitionProbability(cw.getCellAt(1, 1),
cw.getCellAt(1, 1), CellWorldAction.Right), DELTA_THRESHOLD);
Assert.assertEquals(0.1, mdp.transitionProbability(cw.getCellAt(1, 2),
cw.getCellAt(1, 1), CellWorldAction.Right), DELTA_THRESHOLD);
Assert.assertEquals(0.0, mdp.transitionProbability(cw.getCellAt(1, 3),
cw.getCellAt(1, 1), CellWorldAction.Right), DELTA_THRESHOLD);
}
@Test
public void testRewardFunction() {
// Ensure all actions can be performed in each cell.
for (Cell<Double> s : cw.getCells()) {
if (4 == s.getX() && 3 == s.getY()) {
Assert.assertEquals(1.0, mdp.reward(s), DELTA_THRESHOLD);
} else if (4 == s.getX() && 2 == s.getY()) {
Assert.assertEquals(-1.0, mdp.reward(s), DELTA_THRESHOLD);
} else {
Assert.assertEquals(-0.04, mdp.reward(s), DELTA_THRESHOLD);
}
}
}
}