def test_car_does_not_bounce_off_wall(col_action):
col = col_action[0]
action = col_action[1]
car = Car(col, 1)
speed_limit = 5
next_car = car.next(action, speed_limit)
assert next_car.col < 0 or next_car.col > 3
def test_prob_of_moving_car_appearing():
car_col = 0
s = dg_road.LaneAndDitchRoad(
headlight_range=3,
car=Car(col=car_col, speed=0),
obstacles=[Pedestrian(-1, -1, speed=1, prob_of_appearing=0.05)],
allowed_obstacle_appearance_columns=[{1}])
successors = [(sp.to_key(), prob) for sp, prob in s.successors(NO_OP)]
assert len(successors) == 2
assert successors[0] == ((car_col, 0, frozenset()), 0.95)
assert successors[1] == ((car_col, 0, frozenset([('p', 0, 1, 1, 0)])),
0.05)
s = dg_road.LaneAndDitchRoad(
headlight_range=3,
car=Car(col=car_col, speed=1),
obstacles=[Pedestrian(-1, -1, speed=1, prob_of_appearing=0.05)],
allowed_obstacle_appearance_columns=[{1}])
successors = [(sp.to_key(), prob) for sp, prob in s.successors(NO_OP)]
assert len(successors) == 3
assert successors[0] == ((car_col, 1, frozenset()),
1 - (0.05 * (1 - 0.05) + 0.05))
assert successors[1] == ((car_col, 1, frozenset([('p', 0, 1, 1, 0)])),
0.05 * (1 - 0.05))
assert successors[2] == ((car_col, 1, frozenset([('p', 1, 1, 1, 0)])),
0.05)
def test_car_offroad():
headlight_range = 4
road1 = Road(headlight_range, Car(0, 1), [])
action_taken1 = hand_coded_data_gathering_policy(road1)
assert action_taken1 == RIGHT
road2 = Road(headlight_range, Car(3, 1), [])
action_taken2 = hand_coded_data_gathering_policy(road2)
assert action_taken2 == LEFT
def test_collision_if_car_drives_at_full_speed():
hr = 3
s = Road(headlight_range=hr, car=Car(2, hr), obstacles=[Bump(hr + 1, 2)])
s_p = Road(headlight_range=hr, car=Car(2, hr), obstacles=[Bump(hr, 2)])
num_collisions = s.count_obstacle_collisions(
s_p, lambda obs: int(isinstance(obs, Bump))).pop()
assert num_collisions == 1
num_collisions = s_p.count_obstacle_collisions(
s, lambda obs: int(isinstance(obs, Bump))).pop()
assert num_collisions == 0
def test_collision_if_car_changes_lanes_into_obstacle():
hr = 3
s = Road(headlight_range=hr, car=Car(2, 1), obstacles=[Bump(hr, 1)])
s_p = Road(headlight_range=hr, car=Car(1, 1), obstacles=[Bump(hr, 1)])
num_collisions = s.count_obstacle_collisions(
s_p, lambda obs: int(isinstance(obs, Bump))).pop()
assert num_collisions == 1
num_collisions = s_p.count_obstacle_collisions(
s, lambda obs: int(isinstance(obs, Bump))).pop()
assert num_collisions == 0
def test_car_has_crashed(col):
patient = Road(4, Car(col, 1), [])
assert patient.has_crashed()
assert patient.has_crashed(Car(col, 1))
assert not patient.has_crashed(Car(0, 1))
assert patient.to_key() == (-1, 0, frozenset())
for action in ACTIONS:
successors, probs = zip(*patient.successors(action))
assert [s.to_key() for s in successors] == [(-1, 0, frozenset())]
assert sum(probs) == pytest.approx(1.0)
def test_car_can_only_overdrive_headlights_by_one_unit():
headlight_range = 2
with pytest.raises(ValueError):
patient = Road(headlight_range, Car(0, speed=headlight_range + 2))
patient = Road(headlight_range, Car(0, headlight_range + 1))
assert patient.speed_limit() == headlight_range + 1
patient = next(patient.successors(UP))[0]
assert patient.speed_limit() == headlight_range + 1
patient._car.speed == patient.speed_limit()
patient = next(patient.successors(DOWN))[0]
patient._car.speed == headlight_range
def test_fast_obstacles(p):
car_col = 0
s = dg_road.LaneAndDitchRoad(
headlight_range=3,
car=Car(col=car_col, speed=1),
obstacles=[Pedestrian(-1, -1, speed=4, prob_of_appearing=p)],
allowed_obstacle_appearance_columns=[{1}])
successors = sorted([(sp.to_key(), prob)
for sp, prob in s.successors(NO_OP)],
key=lambda x: x[1])
if p < 1:
assert len(successors) == 5
assert successors[0] == ((car_col, 1, frozenset([('p', 0, 1, 4, 0)])),
(1 - p)**4 * p)
assert successors[1] == ((car_col, 1, frozenset([('p', 1, 1, 4, 0)])),
(1 - p)**3 * p)
assert successors[2] == ((car_col, 1, frozenset([('p', 2, 1, 4, 0)])),
(1 - p)**2 * p)
assert successors[3] == ((car_col, 1, frozenset([('p', 3, 1, 4, 0)])),
(1 - p)**1 * p)
else:
assert len(successors) == 1
assert successors[-1] == ((car_col, 1, frozenset()),
pytest.approx((1 - p)**5 + p))
assert sum(prob for _, prob in successors) == pytest.approx(1)
def test_probabilities_error():
state = dg_road.LaneAndDitchRoad(headlight_range=3,
car=Car(1, 1),
obstacles=[Bump(-1, -1),
Bump(-1, -1)])
probs = [p for (s, p) in state.successors(NO_OP)]
assert sum(probs) == pytest.approx(1.0)
def test_speedometer_layer(speed):
headlight_range = 4
patient = dg_road.LaneAndDitchRoad(headlight_range, Car(1, speed=speed),
[])
x = np.full([headlight_range + 1, 5], False)
x[headlight_range + 1 - speed:, -1] = True
np.testing.assert_array_equal(patient.speedometer_layer(), x)
def test_number_of_successors_invisible_obstacle_and_variable_speeds(
obst, action, speed):
headlight_range = 2
road_test = Road(headlight_range, Car(1, speed), [obst])
probs = [prob for next_state, prob in road_test.successors(action)]
assert (len(probs) == 4 *
max(0, speed - int(action == LEFT or action == RIGHT)) + 1)
def test_no_obstacles_revealed_is_the_only_valid_set_of_revealed_obstacles_when_all_obstacles_already_on_road(
obst):
headlight_range = 2
lane_and_ditch = dg_road.LaneAndDitchRoad(headlight_range, Car(1, 1),
[obst])
patient = list(lane_and_ditch.every_combination_of_revealed_obstacles(1))
assert patient == [{}]
def test_board():
bumps = [Bump(-1, -1), Bump(0, 0), Bump(1, 3)]
pedestrians = [Pedestrian(-1, -1), Pedestrian(0, 1), Pedestrian(1, 2)]
headlight_range = 4
speed = 1
road = Road(headlight_range, Car(1, speed=speed), bumps + pedestrians)
patient = road.board()
assert patient.dtype == 'uint8'
x_board = np.full([headlight_range + 1, road._stage_width],
_byte(' '),
dtype='uint8')
x_board[:, 0] = _byte('|')
x_board[:, -2] = _byte('|')
x_board[:, 1] = _byte('d')
x_board[:, -3] = _byte('d')
x_board[-speed:, -1] = _byte('^')
x_board[0, 1] = bumps[0].to_byte()
x_board[1, 4] = bumps[0].to_byte()
x_board[0, 2] = pedestrians[0].to_byte()
x_board[1, 3] = pedestrians[0].to_byte()
x_board[headlight_range, 1 + 1] = _byte('C')
np.testing.assert_array_equal(patient, x_board)
def test_no_collision_if_obstacle_is_under_car():
hr = 3
car = Car(2, 4)
s = Road(headlight_range=hr, car=car, obstacles=[Bump(hr, 2)])
s_p = Road(headlight_range=hr, car=car, obstacles=[Bump(hr + 1, 2)])
num_collisions = s.count_obstacle_collisions(
s_p, lambda obs: int(isinstance(obs, Bump))).pop()
assert num_collisions == 0
def test_to_s():
bumps = [Bump(-1, -1), Bump(0, 0), Bump(1, 1)]
pedestrians = [Pedestrian(-1, -1), Pedestrian(0, 1), Pedestrian(1, 0)]
headlight_range = 4
speed = 1
patient = dg_road.LaneAndDitchRoad(headlight_range, Car(1, speed=speed),
bumps + pedestrians).to_s()
assert patient == '|bp| \n|pb| \n| d| \n| d| \n| C|^'
def test_to_s():
bumps = [Bump(-1, -1), Bump(0, 0), Bump(1, 3)]
pedestrians = [Pedestrian(-1, -1), Pedestrian(0, 1), Pedestrian(1, 2)]
headlight_range = 4
speed = 1
patient = Road(headlight_range, Car(1, speed=speed),
bumps + pedestrians).to_s()
assert patient == '|bp d| \n|d pb| \n|d d| \n|d d| \n|dC d|^'
def test_policy_speeds_up_but_does_not_overdrive_headlights():
headlight_range = 4
road = Road(headlight_range, Car(2, headlight_range + 1), [])
action_taken = hand_coded_data_gathering_policy(road)
assert action_taken == DOWN
road = Road(headlight_range, Car(2, headlight_range), [])
action_taken = hand_coded_data_gathering_policy(road)
assert action_taken == NO_OP
road = Road(headlight_range, Car(2, headlight_range - 1), [])
action_taken = hand_coded_data_gathering_policy(road)
assert action_taken == NO_OP
road = Road(headlight_range, Car(2, headlight_range - 2), [])
action_taken = hand_coded_data_gathering_policy(road)
assert action_taken == UP
def test_obstacles_outside_headlight_range_are_hidden():
bumps = [Bump(-1, 0)]
headlight_range = 4
patient = Road(headlight_range, Car(1, 1), bumps).obstacle_layers()
assert len(patient) == 1
x_bump_layer = np.full([headlight_range + 1, 7], False)
np.testing.assert_array_equal(patient[str(bumps[0])], x_bump_layer)
def test_simple_collision():
hr = 3
car = Car(2, 4)
s = Road(headlight_range=hr, car=car, obstacles=[Bump(-1, -1)])
s_p = Road(headlight_range=hr, car=car, obstacles=[Bump(hr, 2)])
num_collisions = s.count_obstacle_collisions(
s_p, lambda obs: int(isinstance(obs, Bump))).pop()
assert num_collisions == 1
def test_crashing_into_right_wall():
patient = Road(1, Car(3, 1), [])
successors = list(patient.successors(RIGHT))
assert len(successors) == 1
s, p = successors[0]
assert p == 1.0
assert s.to_key() != patient.to_key()
assert s.to_key() == (-1, 0, frozenset())
assert s.to_s() == ' ' * 7 + '\n' + ' ' * 7
def test_moving_car_appears_when_stopped():
s = Road(headlight_range=3,
car=Car(2, 0),
obstacles=[Pedestrian(-1, -1, speed=1, prob_of_appearing=0.5)],
allowed_obstacle_appearance_columns=[{1}])
successors = [(sp.to_key(), prob) for sp, prob in s.successors(NO_OP)]
assert len(successors) == 2
assert successors[0] == ((2, 0, frozenset()), 0.5)
assert successors[1] == ((2, 0, frozenset([('p', 0, 1, 1, 0)])), 0.5)
def new_road():
if one_way:
return dg_road.LaneAndDitchRoad(
headlight_range,
Car(0, 0),
obstacles=[
Bump(-1, -1, prob_of_appearing=1.0),
],
allowed_obstacle_appearance_columns=[{0, 1}],
allow_crashing=allow_crashing)
else:
return dg_road.Road(headlight_range,
Car(2, 0),
obstacles=[
Bump(-1, -1, prob_of_appearing=1.0),
],
allowed_obstacle_appearance_columns=[{0, 1}],
allow_crashing=allow_crashing)
def new_road(headlight_range=3):
return Road(
headlight_range,
Car(2, 0),
obstacles=[
Bump(-1, -1, prob_of_appearing=0.16),
Pedestrian(-1, -1, speed=1, prob_of_appearing=0.13)
],
allowed_obstacle_appearance_columns=[{2}, {1}],
allow_crashing=True)
def test_single_terminal_state():
s = Road(headlight_range=2,
car=Car(2, 0),
obstacles=[Pedestrian(-1, -1, speed=1, prob_of_appearing=0.13)],
allowed_obstacle_appearance_columns=[{1}])
info, _ = s.safety_information()
'''s X a X s X measurement'''
info = np.array(info)
terminal_states, sp = np.where(info[:, NO_OP, :, 0] == 1)
assert np.all(terminal_states == sp)
assert len(terminal_states) == 1
def test_obstacle_appearance_prob(p):
car_col = 0
s = dg_road.LaneAndDitchRoad(headlight_range=3,
car=Car(col=car_col, speed=1),
obstacles=[Bump(-1, -1, prob_of_appearing=p)],
allowed_obstacle_appearance_columns=[{1}])
successors = [(sp.to_key(), prob) for sp, prob in s.successors(NO_OP)]
if p < 1:
assert len(successors) == 2
assert successors[0] == ((car_col, 1, frozenset()), 1.0 - p)
else:
assert len(successors) == 1
assert successors[int(p < 1) * 1] == ((car_col, 1,
frozenset([('b', 0, 1, 0, 0)])), p)
s = dg_road.LaneAndDitchRoad(headlight_range=3,
car=Car(col=car_col, speed=1),
obstacles=[
Bump(-1, -1, prob_of_appearing=p),
Pedestrian(-1, -1, prob_of_appearing=p)
],
allowed_obstacle_appearance_columns=[{0},
{1}])
successors = [(sp.to_key(), prob) for sp, prob in s.successors(NO_OP)]
if p < 1:
assert len(successors) == 4
assert successors[1] == ((car_col, 1, frozenset([('b', 0, 0, 0, 0)])),
pytest.approx(p * (1 - p)))
assert successors[2] == ((car_col, 1, frozenset([('p', 0, 1, 0, 0)])),
pytest.approx(p * (1 - p)))
assert successors[0] == ((car_col, 1, frozenset()),
pytest.approx(1 - 2 * p * (1 - p) - p * p))
else:
assert len(successors) == 1
assert successors[int(p < 1) * 3] == ((car_col, 1,
frozenset([('b', 0, 0, 0, 0),
('p', 0, 1, 0, 0)])),
pytest.approx(p * p))
def test_number_of_successors_invisible_obstacle_and_variable_speeds(
obst, action, speed):
headlight_range = 2
lane_and_ditch = dg_road.LaneAndDitchRoad(headlight_range, Car(1, speed),
[obst])
probs = [prob for next_state, prob in lane_and_ditch.successors(action)]
print(action)
print(probs)
if action == RIGHT:
assert probs == [1.0]
else:
assert (len(probs) == 2 * max(0, speed - int(action == LEFT)) + 1)
def test_safety_information():
patient = Road(headlight_range=1, car=Car(2, 0), obstacles=[Bump(-1, -1)])
counts, state_indices = patient.safety_information()
counts = np.array(counts)
assert len(counts.shape) == 4
assert counts.shape[0] == len(state_indices)
assert counts.shape[1] == len(ACTIONS)
assert counts.shape[2] == len(state_indices)
assert counts.shape[3] == 7
def test_crashing_into_right_wall():
patient = dg_road.LaneAndDitchRoad(headlight_range=1,
car=Car(col=1, speed=1),
obstacles=[])
successors = list(patient.successors(RIGHT))
assert len(successors) == 1
s, p = successors[0]
assert p == 1.0
assert s.to_key() != patient.to_key()
assert s.to_key() == (-1, 0, frozenset())
assert s._stage_width == 5
assert s.to_s() == ' ' * 5 + '\n' + ' ' * 5
def test_to_key():
bumps = [Bump(0, 2)]
headlight_range = 1
car = Car(2, 1)
patient = Road(headlight_range, car, bumps).to_key()
assert patient == (2, 1, frozenset([('b', 0, 2, 0, 0)]))
obstacles = [
Bump(-1, 0),
Bump(-1, -1),
Bump(0, 2),
Pedestrian(1, 1),
Pedestrian(1, 2),
Pedestrian(2, 3)
]
headlight_range = 1
car = Car(2, 1)
patient = Road(headlight_range, car, obstacles).to_key()
assert patient == (
2,
1,
frozenset([('b', 0, 2, 0, 0), ('p', 1, 1, 0, 0), ('p', 1, 2, 0, 0)])) # yapf:disable
def test_no_collision_if_obstacle_is_removed_from_the_road():
hr = 3
car = Car(2, 4)
s_p = dg_road.LaneAndDitchRoad(headlight_range=hr,
car=car,
obstacles=[Bump(-1, -1)])
s = dg_road.LaneAndDitchRoad(headlight_range=hr,
car=car,
obstacles=[Bump(hr, 2)])
num_collisions = s.count_obstacle_collisions(
s_p, lambda obs: int(isinstance(obs, Bump))).pop()
assert num_collisions == 0
