def fit_stoch(X, y, alpha, w, epochs=500, epsilon=1.0e-5):
"""
Stochastic gradient descent
:param X:
:param y:
:param alpha:
:param w:
:param epochs:
:param epsilon:
:return:
"""
global logs, logs_stoch
logs = []
logs_stoch = []
random.seed(0)
idx = list(range(len(X)))
for epoch in range(epochs):
random.shuffle(idx)
for i in idx:
y_hat = predict([X[i]], w)[0]
loss = y[i] - y_hat
gradient = vector.mul(loss, X[i])
w = vector.add(w, vector.mul(alpha, gradient))
logs_stoch += (w, alpha, sse(X, y, w))
if vector.norm(gradient) < epsilon:
print('Gradient', vector.norm(gradient))
break
logs += (w, alpha, sse(X, y, w))
print("Epoch", epoch)
return w
def solve_collision(self, b1, b2):
# Changes the direction of non-static moving bodies, and separates overlapping bodies
def penetration(normal, movable_body, fixed_body):
if normal.x < -0.0001:
return abs(movable_body.rect.right() - fixed_body.rect.left())
elif normal.x > 0.0001:
return abs(fixed_body.rect.right() - movable_body.rect.left())
if normal.y < -0.0001:
return abs(fixed_body.rect.top() - movable_body.rect.bottom())
else:
return abs(movable_body.rect.top() - fixed_body.rect.bottom())
if b1.is_static and not (b2.is_static):
normal = self.calculate_normal(b2, b1)
pen_distance = penetration(normal, b2, b1)
b2.rect.position = vector.sum(b2.rect.position, vector.mul(normal, pen_distance))
b2.direction = vector.reflect(normal, b2.direction)
return normal
elif not (b1.is_static) and b2.is_static:
normal = self.calculate_normal(b1, b2)
pen_distance = penetration(normal, b1, b2)
b1.rect.position = vector.sum(b1.rect.position, vector.mul(normal, pen_distance))
b1.direction = vector.reflect(normal, b1.direction)
return normal
elif not (b1.is_static) and not (b2.is_static):
normal = self.calculate_normal(b1, b2)
normal_inv = vector.minus(normal)
pen_distance = penetration(normal, b1, b2)
b1.rect.set_pos(vector.sum(b1.rect.position, vector.mul(normal, 0.5 * pen_distance)))
b1.direction = vector.reflect(normal, b1.direction)
b2.rect.position = vector.sum(b2.rect.position, vector.mul(normal_inv, 0.5 * pen_distance))
b2.direction = vector.reflect(normal_inv, b2.get_direction())
return normal
def stoch_descent(X, y, alpha, w):
"""
Stochastic gradient descent
:param X:
:param y:
:param alpha:
:param w:
:return:
"""
global logs, logs_stoch
logs = []
logs_stoch = []
random.seed(0)
idx = list(range(len(X)))
for epoch in range(1000):
random.shuffle(idx)
w_old = w
for i in idx:
loss = y[i] - vector.dot(X[i], w)
gradient = vector.mul(loss, X[i])
w = vector.add(w, vector.mul(alpha, gradient))
logs_stoch += (w, alpha, sse(X, y, w))
if vector.norm(vector.sub(w, w_old)) / vector.norm(w) < 1.0e-5:
break
logs += (w, alpha, sse(X, y, w))
print("Epoch", epoch)
return w
def stoch_descent(X, y, alpha, w):
"""
Stochastic gradient descent
:param X:
:param y:
:param alpha:
:param w:
:return:
"""
global logs, logs_stoch
logs = []
logs_stoch = []
random.seed(0)
idx = list(range(len(X)))
for epoch in range(1000):
random.shuffle(idx)
w_old = w
for i in idx:
loss = y[i] - vector.dot(X[i], w)
gradient = vector.mul(loss, X[i])
w = vector.add(w, vector.mul(alpha, gradient))
logs_stoch += (w, alpha, sse(X, y, w))
if vector.norm(vector.sub(w, w_old)) / vector.norm(w) < 1.0e-5:
break
logs += (w, alpha, sse(X, y, w))
print("Epoch", epoch)
return w
def __backward(self, dout):
dbeta = dout.sum(axis=0)
dgammax = dout
dgamma = ve.sum(ve.mul(self.xhat, dgammax), axis=0)
dxhat = dgammax * self.gamma
divar = ve.sum(ve.mul(dxhat, self.xmu), axis=0)
dxmu1 = dxhat * self.ivar
dsqrtvar = divar * (1 / (self.sqrtvar**2)) * (-1)
dvar = (1 / ve.sqrt(self.var + 10e-7)) * dsqrtvar * 0.5
dsq = ve.arange([
1 for i in range(reduce(lambda x, y: x * y, dout.get_demension()))
]).reshape(dout.get_demension()) * (dvar / dout.get_demension()[1])
dxmu2 = ve.mul(self.xmu, dsq) * 2
dx1 = dxmu1 + dxmu2
dmu = ve.sum(dxmu1 + dxmu2, axis=0) * (-1)
dx2 = ve.arange([
1 for i in range(reduce(lambda x, y: x * y, dout.get_demension()))
]).reshape(dout.get_demension()) * (dmu / dout.get_demension()[1])
dx = dx1 + dx2
return dx
def train(self, training_input):
wrong_predictions = 0
for input, label in zip([item[1:] for item in training_input], [item[0] for item in training_input]):
prediction = self.predict(input)
if prediction != label:
wrong_predictions += 1
if label == 0 and prediction == 1:
self.weights[1:] = vector.sub(self.weights[1:], vector.mul(self.learning_rate, input))
self.weights[0] -= self.learning_rate
if label == 1 and prediction == 0:
self.weights[1:] = vector.add(vector.mul(self.learning_rate, input), self.weights[1:])
self.weights[0] += self.learning_rate
def update(self, step_time):
def change_dir_vel(entities, direction, velocity):
for entity in entities:
entity.body.direction = direction
entity.body.set_velocity(velocity)
if (self.moving_left or self.moving_right):
if self.moving_left:
change_dir_vel(self.paddles, Vector2(-1, 0), PADDLE_VELOCITY)
if self.game_status == GameLayer.INITIALIZATION:
change_dir_vel(self.balls, Vector2(-1, 0), PADDLE_VELOCITY)
else:
change_dir_vel(self.paddles, Vector2(1, 0), PADDLE_VELOCITY)
if self.game_status == GameLayer.INITIALIZATION:
change_dir_vel(self.balls, Vector2(1, 0), PADDLE_VELOCITY)
else:
change_dir_vel(self.paddles, ZERO2, magnitude(ZERO2))
if self.game_status == GameLayer.INITIALIZATION:
change_dir_vel(self.balls, ZERO2, magnitude(ZERO2))
if self.push_balls and self.game_status == GameLayer.INITIALIZATION:
for ball in self.balls:
if ball.body.is_static:
ball.body.is_static = False
v = Vector2(BALL_VELOCITY_X, BALL_VELOCITY_Y)
change_dir_vel(self.balls, normalize(v), magnitude(v))
self.push_balls = False
self.game_status = GameLayer.GAME_LOOP
# Remove bricks that have been destroyed
free_brick_list = []
for brick in self.bricks:
if brick.health_points == 0:
self.unregister_entity(brick)
free_brick_list.append(brick)
self.bricks = [b for b in self.bricks if free_brick_list.count(b) == 0]
for paddle in self.paddles:
# Integrate paddle
paddle.body.rect.position = sum(
paddle.body.rect.position,
mul(paddle.body.direction, paddle.body.velocity * step_time))
# Relocate paddle position to a valid position range
paddle.body.rect.position.x = utils.clamp(
paddle.body.rect.position.x, 0, WINDOW_WIDTH - PADDLE_WIDTH)
paddle.body.rect.position.y = WINDOW_HEIGHT - PADDLE_HEIGHT - PADDLE_LINE_SPACING
for ball in self.balls:
if ball.body.is_static:
pos_r = Vector2((PADDLE_WIDTH - BALL_WIDTH) * 0.5,
-BALL_HEIGHT)
ball.body.rect.position = sum(
self.paddles[0].body.rect.position, pos_r)
def walls(self, width, height):
""" Return all the walls which can be used for drawing the maze. """
maze_width, maze_height = len(self.grid[0]), len(self.grid)
scalex, scaley = width / maze_width, height / maze_height
scale = min(scalex, scaley)
centerx = (width - scale * (maze_width - 1)) / 2
centery = (height - scale * (maze_height - 1)) / 2
center = (centerx, centery)
walls = []
# Draw all the horizontal going walls.
for y in range(maze_height):
lines = ''.join(map(str, self.grid[y])).split(str(EMPTY))
offset = 0
for line in lines:
if len(line) > 1:
start = add(center, mul((offset, y), scale))
end = add(center, mul(((offset + len(line)-1), y), scale))
walls.append(Wall(start, end))
offset += len(line) + 1
else:
offset += 2
# Draw all the vertical going walls.
grid_transposed = [list(x) for x in zip(*self.grid)]
for x in range(maze_width):
lines = ''.join(map(str, grid_transposed[x])).split(str(EMPTY))
offset = 0
for line in lines:
if len(line) > 1:
start = add(center, mul((x, offset), scale))
end = add(center, mul((x, (offset + len(line)-1)), scale))
walls.append(Wall(start, end))
offset += len(line) + 1
else:
offset += 2
return walls
def move(self, move, walls):
angle_offset = 0
if move == MOVE_EAST or move == MOVE_WEST:
angle_offset = 90 if move == MOVE_WEST else -90
elif move == MOVE_SOUTH:
angle_offset = -180
move_vector = atov(self.angle + 30 + angle_offset)
newpos = add(self.pos, mul(move_vector, Player.AMPLIFIER_MOVE))
if not intersect_segments(Line(self.pos, newpos), walls):
self.pos = newpos
for ray in self.rays: ray.update(newpos)
def update(self, step_time):
def change_dir_vel(entities, direction, velocity):
for entity in entities:
entity.body.direction = direction
entity.body.set_velocity(velocity)
if(self.moving_left or self.moving_right):
if self.moving_left:
change_dir_vel(self.paddles, Vector2(-1,0), PADDLE_VELOCITY)
if self.game_status == GameLayer.INITIALIZATION:
change_dir_vel(self.balls, Vector2(-1,0), PADDLE_VELOCITY)
else:
change_dir_vel(self.paddles, Vector2(1,0), PADDLE_VELOCITY)
if self.game_status == GameLayer.INITIALIZATION:
change_dir_vel(self.balls, Vector2(1,0), PADDLE_VELOCITY)
else:
change_dir_vel(self.paddles, ZERO2, magnitude(ZERO2))
if self.game_status == GameLayer.INITIALIZATION:
change_dir_vel(self.balls, ZERO2, magnitude(ZERO2))
if self.push_balls and self.game_status == GameLayer.INITIALIZATION:
for ball in self.balls:
if ball.body.is_static:
ball.body.is_static = False
v = Vector2(BALL_VELOCITY_X, BALL_VELOCITY_Y)
change_dir_vel(self.balls, normalize(v), magnitude(v))
self.push_balls = False
self.game_status = GameLayer.GAME_LOOP
# Remove bricks that have been destroyed
free_brick_list = []
for brick in self.bricks:
if brick.health_points == 0:
self.unregister_entity(brick)
free_brick_list.append(brick)
self.bricks = [ b for b in self.bricks if free_brick_list.count(b) == 0 ]
for paddle in self.paddles:
# Integrate paddle
paddle.body.rect.position = sum(paddle.body.rect.position,
mul(paddle.body.direction, paddle.body.velocity * step_time))
# Relocate paddle position to a valid position range
paddle.body.rect.position.x = utils.clamp(paddle.body.rect.position.x, 0,
WINDOW_WIDTH - PADDLE_WIDTH)
paddle.body.rect.position.y = WINDOW_HEIGHT - PADDLE_HEIGHT - PADDLE_LINE_SPACING
for ball in self.balls:
if ball.body.is_static:
pos_r = Vector2((PADDLE_WIDTH - BALL_WIDTH) * 0.5, - BALL_HEIGHT)
ball.body.rect.position = sum(self.paddles[0].body.rect.position, pos_r)
def batch_descent(X, y, alpha, w):
global logs
logs = []
alpha /= len(X)
for epoch in range(1, 1000):
loss = vector.sub(y, vector.mul_mat_vec(X, w))
gradient = vector.mul_mat_vec(vector.transpose(X), loss)
w_old = w
w = vector.add(w, vector.mul(alpha, gradient))
logs += (w, alpha, sse(X, y, w))
if vector.norm(vector.sub(w, w_old)) / vector.norm(w) < 1.0e-5:
break
print("Epoch", epoch)
return w
def batch_descent(X, y, alpha, w):
"""
Batch gradient descent
:param X:
:param y:
:param alpha:
:param w:
:return:
"""
global logs
logs = []
alpha /= len(X)
for epoch in range(1, 1000):
loss = vector.sub(y, vector.mul_mat_vec(X, w))
gradient = vector.mul_mat_vec(vector.transpose(X), loss)
w_old = w
w = vector.add(w, vector.mul(alpha, gradient))
logs += (w, alpha, sse(X, y, w))
if vector.norm(vector.sub(w, w_old)) / vector.norm(w) < 1.0e-5:
break
print("Epoch", epoch)
return w
def fit_batch(X, y, alpha, w, epochs=500, epsilon=1.0e-5):
"""
Batch gradient descent
:param X:
:param y:
:param alpha:
:param w:
:param epochs:
:param epsilon:
:return:
"""
global logs
logs = []
alpha /= len(X)
for epoch in range(epochs):
y_hat = predict(X, w)
loss = vector.sub(y, y_hat)
gradient = vector.mul_mat_vec(vector.transpose(X), loss)
w = vector.add(w, vector.mul(alpha, gradient))
logs += (w, alpha, sse(X, y, w))
if vector.norm(gradient) < epsilon:
break
print("Epoch", epoch)
return w
def __init__(self, size):
self.walls = generate(10, 10).walls(*size)
self.player = Player(mul(size, 0.4), size[0])
def mul(P, Q):
w1, v1 = P
w2, v2 = Q
return (w1*w2 - _v.dot(v1, v2),_v.sum(_v.mul(w1, v2), _v.mul(w2, v1), _v.cross(v1, v2)))
def draw(self, surface, color='black', width=1):
towards = add(self.p1, mul(sub(self.p2, self.p1), Ray.AMPLIFIER_DRAW))
pygame.draw.line(surface, pygame.Color(color), self.p1, towards, width)
def integrate(self, elapsed_time):
if not (self.is_static):
self.rect.position = vector.sum(
self.rect.position, vector.mul(self.direction, self.velocity * elapsed_time)
)
