nn = Network([n, 20, N], [None, 'sigmoid', 'softmax'], [True, True, False],
layer_weight_means_and_stds=[(0, 0.1), (0, 0.1)])
# Learning rate
eta = 0.001
# Number of iterations to complete
N_iterations = 10000
# Perform gradient descent
for i in range(N_iterations):
# For stochastic gradient descent, take random samples of X and T
# Run the features through the neural net (to compute a and z)
y_pred = nn.feed_forward(X)
# Compute the gradient
grad_w = nn._gradient_fun(X, T)
# Update the neural network weight matrices
for w, gw in zip(nn.weights, grad_w):
w -= eta * gw
# Print some statistics every thousandth iteration
if i % 1000 == 0:
misclassified = sum(np.argmax(y_pred, axis=1) != y.ravel())
print(
"Iteration: {0}, Objective Function Value: {1:3f}, Misclassified: {2}"
.format(i, nn._J_fun(X, T), misclassified))
layer_weight_means_and_stds=[(0, 0.1), (0, 0.1)])
eta = 0.005
# Number of iterations to complete
N_iterations = 500000
batch_size = int(m / 10)
# Perform gradient descent
for i in range(N_iterations):
# For stochastic gradient descent, take random samples of X and T
batch = np.random.randint(0, m, size=batch_size)
# Run the features through the neural net (to compute a and z)
y_pred = nn.feed_forward(X)
# Compute the gradient
grad_w = nn._gradient_fun(X, y)
# Update the neural network weight matrices
for w, gw in zip(nn.weights, grad_w):
w -= eta * gw
# Print some statistics every thousandth iteration
if i % 10000 == 0:
print('Iteration: {0}, Objective Function Value: {1:3f}'
.format(i, nn._J_fun(X, y_pred)))
print('Total error: {}'.format(
np.abs(np.sum(y_pred - y) / np.sum(y))))
from neural_network import Network
# define
net = Network([2, 3, 3])
dataset = [
((0, 0), (0, 0, 0)),
((0, 1), (0, 1, 1)),
((1, 0), (0, 1, 1)),
((1, 1), (1, 1, 0)),
]
# teach
for net_error in net.teach_loop(dataset):
print(net_error)
# evaluate results
while True:
values = input("Inputs: ")
while True:
try:
inputs = tuple(int(v) for v in values.split())
except ValueError:
pass
else:
break
# eval
outputs = net.feed_forward(inputs)
print(outputs)
print([round(o) for o in outputs])
class AutonomousSnake:
directions = {0: np.array([0, -1]), 1: np.array([1, -1]), 2: np.array([1, 0]), 3: np.array([1, 1]),
4: np.array([0, 1]), 5: np.array([-1, 1]), 6: np.array([-1, 0]), 7: np.array([-1, -1])}
def __init__(self, pos=[13, 13], length=5, base_max_moves=100, field_width=25, field_height=25):
self.field_width = field_width
self.field_height = field_height
self.position = np.array([pos[0], pos[1]])
self.velocity = self.directions[np.random.choice([0, 2, 4, 6])]
self.length = length
self.score = 0
self.brain = Network([24, 18, 4])
self.tail = np.empty(shape=[0, 2])
for i in range(self.length - 1, 0, -1):
self.tail = np.append(self.tail, [self.position - i * self.velocity], axis=0)
self.alive = True
self.time_alive = 0
self.max_moves = base_max_moves
self.moves_left = self.max_moves
self.grow_count = 0
self.lastMoveDir = np.array(self.velocity)
self.food = self.place_food()
self.vision = np.zeros(24)
self.fitness = 0
def think(self):
self.see()
decision = self.brain.feed_forward(self.vision.reshape((24, 1)))
# decision_arg = np.argmax(decision)
chosen_direction = self.directions[np.argmax(decision) * 2]
if not np.array_equal(chosen_direction, -self.velocity):
self.velocity = chosen_direction
# self.velocity = self.directions[decision_arg * 2] # if not np.array_equal(self.velocity, -self.directions[
# decision_arg * 2]) else self.velocity
def move(self):
if self.will_collide():
self.alive = False
if not self.alive:
return
self.tail = np.append(self.tail, [self.position], axis=0)
self.position += self.velocity
if self.grow_count == 0:
self.tail = np.delete(self.tail, 0, 0)
else:
self.grow_count -= 1
self.length += 1
self.lastMoveDir = self.velocity
if np.array_equal(self.position, self.food):
self.eat()
self.time_alive += 1
self.moves_left -= 1
if self.moves_left <= 0:
self.alive = False
def eat(self):
self.food = self.place_food()
self.grow_count += 1
self.score += 1
self.moves_left = self.max_moves
def place_food(self):
pos = np.array([np.random.randint(0, self.field_width), np.random.randint(0, self.field_height)])
while self.occupied(pos):
pos = np.array([np.random.randint(0, self.field_width), np.random.randint(0, self.field_height)])
return pos
def calc_fitness(self):
if self.score < 10:
self.fitness = math.floor(self.time_alive ** 2 * 2 ** self.score)
else:
self.fitness = self.time_alive ** 2 * 2 ** 10 * (self.score - 9)
# Check if the position is occupied by the body of the snake
def occupied(self, pos):
for cell in self.tail:
if np.array_equal(cell, pos):
return True
return np.array_equal(self.position, pos)
def will_collide(self):
next_position = self.position + self.velocity
if self.is_on_tail(next_position):
return True
return (next_position[0] < 0 or next_position[0] >= self.field_width or next_position[1] < 0 or next_position[
1] >= self.field_height)
def is_on_tail(self, pos):
for cell in self.tail:
if np.array_equal(pos, cell):
return True
return False
def see(self):
self.vision = np.array([])
for d in self.directions:
d_vision = self.look_in_direction(self.directions[d])
self.vision = np.append(self.vision, d_vision)
def look_in_direction(self, direction):
cur_pos = self.position + direction
vision = np.zeros(3)
food_found = False
tail_found = False
distance = 1.0
while not (
cur_pos[0] < 0 or cur_pos[0] >= self.field_width or cur_pos[1] < 0 or cur_pos[1] >= self.field_height):
if not food_found and np.array_equal(self.food, cur_pos):
vision[0] = 1.0
food_found = True
if not tail_found and self.is_on_tail(cur_pos):
vision[1] = 1.0 / distance
tail_found = True
cur_pos = cur_pos + direction
distance += 1.0
vision[2] = 1.0 / distance
return vision
def crossover_brain(self, other):
new_snake = AutonomousSnake()
if self.fitness > other.fitness:
new_snake.brain = self.brain.crossover(other.brain)
else:
new_snake.brain = other.brain.crossover(self.brain)
return new_snake
def mutate(self, rate, mag):
self.brain.mutate(rate, mag)
def reincarnate(self):
self.position = np.array((13, 13))
self.velocity = self.directions[np.random.choice([0, 2, 4, 6])]
self.length = 5
self.alive = True
self.time_alive = 0
self.grow_count = 0
self.tail = np.empty(shape=[0, 2])
for i in range(self.length - 1, 0, -1):
self.tail = np.append(self.tail, [self.position - i * self.velocity], axis=0)
return self
def set_training_config(self, config):
self.max_moves = config.max_moves
self.moves_left = self.max_moves
def save(self, population, generation):
brain_data = {"sizes": self.brain.sizes,
"weights": self.brain.weights,
"biases": self.brain.biases}
data = {"generation": generation,
# "id": self.sid,
"fitness": self.fitness,
"brain": brain_data}
try:
pickle_out = open("populations/pop{}/gen{}.pickle".format(population, generation), "wb")
except Exception:
os.mkdir("populations/pop{}".format(population))
pickle_out = open("populations/pop{}/gen{}.pickle".format(population, generation), "wb")
pickle_out = open("populations/pop{}/gen{}.pickle".format(population, generation), "wb")
pickle.dump(data, pickle_out)
pickle_out.close()
@classmethod
def load_snake(cls, filename):
pickle_in = open(filename, 'rb')
data = pickle.load(pickle_in)
pickle_in.close()
brain = Network(data["brain"]["sizes"])
brain.weights = [np.array(w) for w in data["brain"]["weights"]]
brain.biases = [np.array(b) for b in data["brain"]["biases"]]
snake = AutonomousSnake()
snake.fitness = data["fitness"]
snake.brain = brain
return snake
def __copy__(self):
snake_copy = AutonomousSnake()
snake_copy.base_max_moves = self.max_moves
snake_copy.brain = copy.copy(self.brain)
return snake_copy