def test_1_hidden_6n_xor(self):
X=[[0,0],[0,1],[1,0],[1,1]]
Y=[[0],[1],[1],[0]]
nn=NN([2,6,1],verbose=0,learning_rate=0.1)
nn.train(X,Y,TRIALS)
report=nn.get_report(X,Y)
self.assertEqual(report["errors"],[])
def test_3_bool_batch(self):
X,Y,a,b=get_data_1csv("tests/3bools.csv",1)
bs=100
nn=NN([3,10,1],verbose=0,learning_rate=0.1/bs)
nn.train(X,Y,TRIALS,batch_size=bs)
report=nn.get_report(X,Y)
self.assertEqual(report["errors"],[])
def test_6_bools(self):
X,Y,a,b=get_data_1csv("tests/6bools.csv",1)
nn=NN([6,36,1],verbose=0,learning_rate=0.1)
nn.train(X,Y,TRIALS)
report=nn.get_report(X,Y)
self.assertEqual(report["errors"],[])
def show_images() -> None:
random.seed(10)
dp = DataProvider.load_from_folder(dataset_folder)
nn = NeuralNet(sizes=[784, 128, 10], epochs=10)
nn.train(dp.get_train_x(), dp.get_hot_encoded_train_y(),
dp.get_test_x(), dp.get_hot_encoded_test_y())
properly_classified, misclassified = nn.get_properly_classified_and_misclassified_images(
dp.get_test_x(), dp.get_hot_encoded_test_y())
print('properly classified')
plt.imshow(properly_classified[0].reshape(28, 28), cmap=cm.binary)
plt.show()
plt.imshow(properly_classified[1].reshape(28, 28), cmap=cm.binary)
plt.show()
plt.imshow(properly_classified[2].reshape(28, 28), cmap=cm.binary)
plt.show()
plt.imshow(properly_classified[3].reshape(28, 28), cmap=cm.binary)
plt.show()
plt.imshow(properly_classified[4].reshape(28, 28), cmap=cm.binary)
plt.show()
print('missclasified')
plt.imshow(misclassified[0].reshape(28, 28), cmap=cm.binary)
plt.show()
plt.imshow(misclassified[1].reshape(28, 28), cmap=cm.binary)
plt.show()
plt.imshow(misclassified[2].reshape(28, 28), cmap=cm.binary)
plt.show()
plt.imshow(misclassified[3].reshape(28, 28), cmap=cm.binary)
plt.show()
plt.imshow(misclassified[4].reshape(28, 28), cmap=cm.binary)
plt.show()
def __init__(self,
batch_size,
memory_capacity,
num_episodes,
learning_rate_drop_frame_limit,
target_update_frequency,
seeds=[104, 106, 108],
discount=0.99,
delta=1,
model_name=None,
visualize=False):
self.env = CarEnvironment(seed=seeds)
self.architecture = NeuralNet()
self.explore_rate = Basic_Explore_Rate()
self.learning_rate = Basic_Learning_Rate()
self.model_path = os.path.dirname(
os.path.realpath(__file__)) + '/models/' + model_name
self.log_path = self.model_path + '/log'
self.visualize = visualize
self.damping_mult = 1
self.initialize_tf_variables()
self.target_update_frequency = target_update_frequency
self.discount = discount
self.replay_memory = Replay_Memory(memory_capacity, batch_size)
self.training_metadata = Training_Metadata(
frame=0,
frame_limit=learning_rate_drop_frame_limit,
episode=0,
num_episodes=num_episodes)
self.delta = delta
document_parameters(self)
def test_with_wrong_input_size(self):
self.assertRaises(NeuralNet.BadArchitecture,
lambda: NeuralNet(input_size=0))
self.assertRaises(NeuralNet.BadArchitecture,
lambda: NeuralNet(input_size=-1))
self.assertRaises(NeuralNet.BadArchitecture,
lambda: NeuralNet(input_size=-10))
def test_6_bools(self):
X, Y, a, b = get_data_1csv("tests/6bools.csv", 1)
nn = NN([6, 36, 1], verbose=0, learning_rate=0.1)
nn.train(X, Y, TRIALS)
report = nn.get_report(X, Y)
self.assertEqual(report["errors"], [])
class Main:
def __init__(self):
self.neural_net = NeuralNet()
self.connection = pika.BlockingConnection(
pika.ConnectionParameters("localhost"))
def connect(self):
channel = self.connection.channel()
channel.queue_declare(queue="neural_net")
channel.basic_consume(self.callback, queue="neural_net", no_ack=True)
print("[*] Waiting for messages. To exit press CTRL+C")
channel.start_consuming()
def callback(self, channel, method, properties, body):
print("[x] Received %r" % body)
parsed_body = json.loads(body)
if isinstance(parsed_body, list):
self.neural_net.update_training_set(body)
self.neural_net.train()
else:
request = parsed_body['request']
result = self.neural_net.predict(request)
self.send_prediction(result)
def send_prediction(self, result):
print("Send %r" % result)
channel = self.connection.channel()
channel.queue_declare(queue="results")
channel.basic_publish(exchange='', routing_key='', body=result)
def test_3_bool_batch(self):
X, Y, a, b = get_data_1csv("tests/3bools.csv", 1)
bs = 100
nn = NN([3, 10, 1], verbose=0, learning_rate=0.1 / bs)
nn.train(X, Y, TRIALS, batch_size=bs)
report = nn.get_report(X, Y)
self.assertEqual(report["errors"], [])
def test_1_hidden_6n_xor(self):
X = [[0, 0], [0, 1], [1, 0], [1, 1]]
Y = [[0], [1], [1], [0]]
nn = NN([2, 6, 1], verbose=0, learning_rate=0.1)
nn.train(X, Y, TRIALS)
report = nn.get_report(X, Y)
self.assertEqual(report["errors"], [])
def test_3_outputs_2_bools(self):
X, Y, a, b = get_data_1csv("tests/3outputs2bools.csv", 1)
nn = NN([2, 50, 3], verbose=0, learning_rate=0.1)
nn.train(X, Y, TRIALS)
report = nn.get_report(X, Y)
self.assertEqual(report["errors"], [])
def test_3_outputs_2_bools(self):
X,Y,a,b=get_data_1csv("tests/3outputs2bools.csv",1)
nn=NN([2,50,3],verbose=0,learning_rate=0.1)
nn.train(X,Y,TRIALS)
report=nn.get_report(X,Y)
self.assertEqual(report["errors"],[])
def test_1_hidden_2n_xor(self):
X=[[0,0],[0,1],[1,0],[1,1]]
Y=[[0],[1],[1],[0]]
nn=NN([2,2,1],verbose=0,learning_rate=0.03,final_learning_rate=0.001)
nn.train(X,Y,30000)
report=nn.get_report(X,Y)
self.assertEqual(report["errors"],[])
def __init__(self, model_location, name):
self._name = name
self._neural_net = NeuralNet(cached_model=model_location)
# Run prediction on random data to make sure that code path is executed at least once before the game starts
random_input_data = np.random.rand(PLANET_MAX_NUM, PER_PLANET_FEATURES)
predictions = self._neural_net.predict(random_input_data)
assert len(predictions) == PLANET_MAX_NUM
def test_3output_dimensions(self):
nn = NN((2, 2, 3), verbose=0)
inputs = ([1, 0], [0, 1], [1, 1], [0, 0])
for i in inputs:
nn.forward(i)
self.assertEqual(nn.outputs[0].shape, (3, 1))
self.assertEqual(nn.outputs[1].shape, (3, 1))
self.assertEqual(nn.outputs[2].shape, (3, 1))
self.assertEqual(nn.get_output().shape, (3, ))
def test_weight_shapes(self):
learning_rate = 0.8
structure = {'num_inputs': 2, 'num_outputs': 1, 'num_hidden': 5}
candidate = NeuralNet(structure, learning_rate)
cand_weights = candidate.get_weights()
self.assertEqual(cand_weights[0].shape, (3, 5))
self.assertEqual(cand_weights[1].shape, (5, 1))
def example3():
"""
Neural net with 1 hidden layer 100 epochs test
"""
dp = DataProvider.load_from_folder(dataset_folder)
nn = NeuralNet(sizes=[784, 128, 10], epochs=100)
nn.train(dp.get_train_x(), dp.get_hot_encoded_train_y(),
dp.get_test_x(), dp.get_hot_encoded_test_y())
def __init__(self, listpos, direction, genome):
self.listpos = listpos
self.direction = direction # 0 = NORTH 1 = SOUTH 2 = EAST 3 = WEST
self.genome = genome
self.color = genome[0]
self.neurons = self.genome
del self.neurons[0]
self.net = NeuralNet(self.neurons)
self.energy = 40000
def test_3output_dimensions(self):
nn=NN((2,2,3),verbose=0)
inputs=([1,0],[0,1],[1,1],[0,0])
for i in inputs:
nn.forward(i)
self.assertEqual(nn.outputs[0].shape,(3,1))
self.assertEqual(nn.outputs[1].shape,(3,1))
self.assertEqual(nn.outputs[2].shape,(3,1))
self.assertEqual(nn.get_output().shape,(3,))
def __init__(self, colour):
self.isPlacing = True
self.board = self.initialiseBoard()
self.neuralNet = NeuralNet()
if colour.upper() == "BLACK":
self.colour = BLACK
else:
self.colour = WHITE
def test_1_hidden_2n_xor(self):
X = [[0, 0], [0, 1], [1, 0], [1, 1]]
Y = [[0], [1], [1], [0]]
nn = NN([2, 2, 1],
verbose=0,
learning_rate=0.03,
final_learning_rate=0.001)
nn.train(X, Y, 30000)
report = nn.get_report(X, Y)
self.assertEqual(report["errors"], [])
def example5():
"""
Tests number of neurons in first hidden layer influence on accuracy of classification;
neural net with 1 hidden layer; 10 epochs
"""
neurons_number = [196, 128, 98, 64, 32, 16]
dp = DataProvider.load_from_folder(dataset_folder)
for n in neurons_number:
nn = NeuralNet(sizes=[784, n, 10])
nn.train(dp.get_train_x(), dp.get_hot_encoded_train_y(),
dp.get_test_x(), dp.get_hot_encoded_test_y())
def test_forward_propagate(self):
learning_rate = 0.8
structure = {'num_inputs': 2, 'num_outputs': 1, 'num_hidden': 1}
candidate = NeuralNet(structure, learning_rate)
x = np.array([1, 0])
cand_out = candidate.forward_propagate(x)
expected_result = .500615025728
print(cand_out)
self.assertAlmostEqual(cand_out, expected_result, 4)
def main():
with gzip.open('../files/mnist.pkl.gz', 'rb') as f:
train_set, valid_set, test_set = cPickle.load(f, encoding="bytes")
nn = NeuralNet([784, 100, 10], [i for i in range(10)],
last_activation=softmax,
optimize_weights_init=True)
nn.train_optimized(train_set,
learning_rate=0.01,
batch_size=100,
iterations=200,
test_data=valid_set,
save=True)
print(nn.test_accuracy(valid_set))
def test_networks(filenames, xs, ys):
from neural_net import NeuralNet
N, D = xs.shape
Ny, M = ys.shape
assert N == Ny
nn = NeuralNet(input_dim=D, output_dim=M)
mpes = []
filenames = sorted(filenames)
for filename in filenames:
nn.load(filename)
mpes.append(mean_percent_error(nn, xs, ys))
return mpes, filenames
def test_metrics() -> None:
random.seed(10)
dp = DataProvider.load_from_folder(dataset_folder)
nn = NeuralNet(sizes=[784, 128, 10], epochs=10)
nn.train(dp.get_train_x(), dp.get_hot_encoded_train_y(),
dp.get_test_x(), dp.get_hot_encoded_test_y())
scores = nn.compute_metrics(dp.get_test_x(),
dp.get_hot_encoded_test_y())
print('precyzja_makro: ', scores['precyzja_makro'])
print('czulosc_makro: ', scores['czulosc_makro'])
print('dokladnosc: ', scores['dokladnosc'])
print('raport: ', scores['raport'])
print('macierz_bledow: ', scores['macierz_bledow'])
def cross_validation(dataset,
percentage_train,
iterations,
iterations_per_iteration,
hidden_layers_sizes,
neurons_type='sigmoid',
alpha=0.0001,
lamb=0.0):
"""
:param dataset: the full dataset
:param percentage_train: float, percentage of instances that needs to go to the test partition
:param iterations: int, number of holdouts to execute
should call holdout to generate the train and test dicts
should call train_NN to train the dataset
should call test_NN to get the performances
:return: (average_performance, stddev_performance)
"""
accuracies = []
precisions = []
recalls = []
for it in range(1, iterations + 1):
#print("Iteration",it)
train_dataset, test_dataset = holdout(dataset, percentage_train)
input_size = len(list(train_dataset.keys())[0])
output_size = len(list(train_dataset.values())[0])
nn = NeuralNet(input_size, output_size, hidden_layers_sizes,
neurons_type, alpha, lamb)
train_NN(nn, train_dataset, iterations_per_iteration)
accuracy, precision, recall = test_NN(nn, test_dataset)
accuracies.append(accuracy)
precisions.append(precision)
recalls.append(recall)
return mean(accuracies), stdev(accuracies), mean(precisions), stdev(
precisions), mean(recalls), stdev(recalls)
def test_created_net_has_correct_layer_sizes(self):
nnet = NeuralNet.create_from_file(fname=self.test_file)
self.assertEqual(nnet.layer_sizes(), self.net_params['layer_sizes'])
net_params = {
'layer_sizes': [1, 1, 1],
'layers': [{
'weights': [[3]],
'biases': [5]
}, {
'weights': [[1]],
'biases': [1]
}]
}
self.make_temp_params_file(net_params)
nnet = NeuralNet.create_from_file(fname=self.test_file)
self.assertEqual(nnet.layer_sizes(), self.net_params['layer_sizes'])
def part_b(file_n):
f = open(file_n, "r")
ip = int(f.readline())
op = int(f.readline())
batch = int(f.readline())
n = int(f.readline())
h = (f.readline()).rstrip().split(" ")
h = map(int, h)
h = [ip] + h + [op]
if f.readline() == "relu\n":
non_lin = 1
else:
non_lin = 0
if f.readline() == "fixed\n":
eta = 0
else:
eta = 1
print ip, op, batch, n
print h
print non_lin, eta
start = timeit.default_timer()
net = NeuralNet(h, bool(non_lin))
net.grad_des(x[:, 0:-1], x[:, -1], batch, bool(eta))
stop = timeit.default_timer()
t_acc = 100 * net.score(x[:, 0:-1], x[:, -1])
ts_acc = 100 * net.score(tests[:, 0:-1], tests[:, -1])
print "Train accuracy ", t_acc
print "Test accuracy ", ts_acc
print "Training time ", (stop - start)
conf = confusion_matrix(tests[:, -1].tolist(), net.pred(tests[:, 0:-1]))
plot_confusion(conf, list(set(tests[:, -1].flatten().tolist())),
"For layers " + str(h))
def part_d(eta_a=False, rlu=False):
tt = np.zeros((5, 2))
m = 0
h = [85, 0, 0, 10]
l = [5, 10, 15, 20, 25]
for i in [5, 10, 15, 20, 25]:
print "For 2 layer ", i, eta_a, rlu
h[1] = i
h[2] = i
start = timeit.default_timer()
net = NeuralNet(h, rlu)
net.grad_des(x[:, 0:-1], x[:, -1], 100, eta_a)
stop = timeit.default_timer()
t_acc = 100 * net.score(x[:, 0:-1], x[:, -1])
ts_acc = 100 * net.score(tests[:, 0:-1], tests[:, -1])
f_ptr.write("\nFor double layer " + str(eta_a) + str(rlu))
f_ptr.write(str(i))
f_ptr.write("\nTraining acc ")
f_ptr.write(str(t_acc))
f_ptr.write("\nTesting acc ")
f_ptr.write(str(ts_acc))
f_ptr.write("\nTrainig time ")
f_ptr.write(str(stop - start))
print "Train accuracy ", t_acc
print "Test accuracy ", ts_acc
print "Training time ", (stop - start)
tt[m, 0] = t_acc
tt[m, 1] = ts_acc
m = m + 1
conf = confusion_matrix(tests[:, -1].tolist(), net.pred(tests[:,
0:-1]))
plot_confusion(conf, list(set(tests[:, -1].flatten().tolist())),
"For 2 layers " + str(h) + str(eta_a) + str(rlu))
print tt
plot_metric(tt, l, "For two hidden layers " + str(eta_a) + str(rlu))
def main():
parser = argparse.ArgumentParser(description="Halite II training")
parser.add_argument("--model_name", help="Name of the model")
parser.add_argument("--minibatch_size", type=int, help="Size of the minibatch", default=100)
parser.add_argument("--steps", type=int, help="Number of steps in the training", default=100)
parser.add_argument("--data", help="Data directory or zip file containing uncompressed games")
parser.add_argument("--cache", help="Location of the model we should continue to train")
parser.add_argument("--games_limit", type=int, help="Train on up to games_limit games", default=1000)
parser.add_argument("--seed", type=int, help="Random seed to make the training deterministic")
parser.add_argument("--bot_to_imitate", help="Name of the bot whose strategy we want to learn")
parser.add_argument("--dump_features_location", help="Location of hdf file where the features should be stored")
args = parser.parse_args()
# Make deterministic if needed
if args.seed is not None:
np.random.seed(args.seed)
nn = NeuralNet(cached_model=args.cache, seed=args.seed)
if args.data.endswith('.zip'):
raw_data = fetch_data_zip(args.data, args.games_limit)
else:
raw_data = fetch_data_dir(args.data, args.games_limit)
data_input, data_output = parse(raw_data, args.bot_to_imitate, args.dump_features_location)
data_size = len(data_input)
training_input, training_output = data_input[:int(0.85 * data_size)], data_output[:int(0.85 * data_size)]
validation_input, validation_output = data_input[int(0.85 * data_size):], data_output[int(0.85 * data_size):]
training_data_size = len(training_input)
# randomly permute the data
permutation = np.random.permutation(training_data_size)
training_input, training_output = training_input[permutation], training_output[permutation]
print("Initial, cross validation loss: {}".format(nn.compute_loss(validation_input, validation_output)))
curves = []
for s in range(args.steps):
start = (s * args.minibatch_size) % training_data_size
end = start + args.minibatch_size
training_loss = nn.fit(training_input[start:end], training_output[start:end])
if s % 25 == 0 or s == args.steps - 1:
validation_loss = nn.compute_loss(validation_input, validation_output)
print("Step: {}, cross validation loss: {}, training_loss: {}".format(s, validation_loss, training_loss))
curves.append((s, training_loss, validation_loss))
cf = pd.DataFrame(curves, columns=['step', 'training_loss', 'cv_loss'])
fig = cf.plot(x='step', y=['training_loss', 'cv_loss']).get_figure()
# Save the trained model, so it can be used by the bot
current_directory = os.path.dirname(os.path.abspath(__file__))
model_path = os.path.join(current_directory, os.path.pardir, "models", args.model_name + ".ckpt")
print("Training finished, serializing model to {}".format(model_path))
nn.save(model_path)
print("Model serialized")
curve_path = os.path.join(current_directory, os.path.pardir, "models", args.model_name + "_training_plot.png")
fig.savefig(curve_path)
def test_created_net_biases(self):
nnet = NeuralNet.create_from_file(fname=self.test_file)
biases = nnet.biases()
expected_biases1 = self.net_params['layers'][0]['biases']
expected_biases2 = self.net_params['layers'][1]['biases']
self.assertEqual(biases[0].tolist(), expected_biases1)
self.assertEqual(biases[1].tolist(), expected_biases2)
class Cell():
def __init__(self, listpos, direction, genome):
self.listpos = listpos
self.direction = direction # 0 = NORTH 1 = SOUTH 2 = EAST 3 = WEST
self.genome = genome
self.color = genome[0]
self.neurons = self.genome
del self.neurons[0]
self.net = NeuralNet(self.neurons)
self.energy = 40000
def display(self):
self.x = (self.listpos % columns) * size
self.y = math.floor(self.listpos / rows) * size
pygame.draw.rect(screen, self.color, (self.x, self.y, size, size))
def run(self):
self.net.neuron_check(self.listpos)
def test_created_net_weights(self):
nnet = NeuralNet.create_from_file(fname=self.test_file)
weights = nnet.weights()
expected_weights1 = self.net_params['layers'][0]['weights']
expected_weights2 = self.net_params['layers'][1]['weights']
self.assertEqual(weights[0].tolist(), expected_weights1)
self.assertEqual(weights[1].tolist(), expected_weights2)
def __init__(self, layer_units):
num_layers = len(layer_units)
rbms = []
for i in range(num_layers - 1):
rbms.append(RBM(layer_units[i], layer_units[i + 1]))
self.layer_units = layer_units
self.num_layers = num_layers
self.rbms = rbms
self.ann = NeuralNet(layer_units + list(reversed(layer_units))[1:])
def __init__(self,
untrained_net=NeuralNet(1024),
training_data=Data(TRAINING_DATASET_DIRECTORY),
validation_data=Data(VALIDATION_DATASET_DIRECTORY)):
self.NN = untrained_net
self.network_backup = untrained_net
self.training_data = training_data
self.validation_data = validation_data
self.m_loss = []
self.accuracy = []
def __init__(self, x_pos, y_pos, ball, game, four_player=False):
self.bounds = pygame.Rect(x_pos, y_pos, 15, 100)
self.ball = ball
self.game = game
self.four_player = four_player
# self.net = NeuralNet(4, 1, 3)
self.net = NeuralNet(3, 1, 3)
self.generation = 0
self.score = 0
self.fitness = 0
self.contacts_ball = 0
self.name = self.random_name()
self.parents = []
self.colors = None
self.color_ndx = 0
self.seizure_reduction = 0
self.seize_rate = random.uniform(0, 15)
self.set_colors()
def test_backward(self):
X=[[0,0],[0,1],[1,0],[1,1]]
Y=[[0],[1],[1],[0]]
nn=NN([2,2,1],verbose=0)
for i in range(4):
nn.forward(X[i])
nn.backward(Y[i])
self.assertEqual(nn.outputs[0].shape,(3,1))
self.assertEqual(nn.outputs[1].shape,(3,1))
self.assertEqual(nn.outputs[2].shape,(1,1))
self.assertEqual(nn.get_output().shape,(1,))
# Choose cost function
cost = "mse"
#cost = "entropy"
# Set plotting parameters
img_file = 'nnet_errorrate_cost.png'
plot_step = 200
pred_epochs = np.arange(0, x_train.shape[0], plot_step)
# Initialize output file for results
output_file = open("./results/results_" + cost + ".txt", "wb")
dash = 25
# Initialize NN classifier
network = NeuralNet(n_inputs, n_hidden, n_outputs, cost=cost, gamma=gamma)
output_file.write(dash * "-" + "\n")
output_file.write("Gamma:" + str(gamma) + "\n")
output_file.write("Cost:" + cost + "\n")
output_file.write(dash * "-" + "\n")
# Fit classifier on training data
start = time.time()
network.fit(x_train, y_train, pred_epochs=pred_epochs, max_epoch=max_epoch)
output_file.write("Training time:" + str(np.around((time.time() - start) / 60., 1)) + "minutes\n")
output_file.write(dash * "-" + "\n")
# Plot training error and error rate
plt.plot(network.pred_errors, '-g', label='Error Rate')
import time
from neural_net import Connection, Aggregator, NeuralNet
c = Connection('postgresql', 'terriergen', 'avahi-daemon', '172.16.10.67', 5432, 'terriergen')
a = Aggregator()
nn = NeuralNet(a, c)
#nn.crossValidation("out.json") # 82.88%
nn.trainFromFile("out.json")
print "Exporting to file"
nn.exportToFile("nn.trained")
vectorizer = ImageVectorizer() paths = vectorizer.get_image_paths() ############################################################ ################### Assignment Questions ################### ############################################################ ############################################################ # Train a feedforward neural network with one hidden layer # # of size 3 to learn representations of those digits. # # Try using (a) Linear transform function # ############################################################ net_3lin = NeuralNet(3, 'linear') net_3lin.train(paths) weights = net_3lin.input_weights_of_hidden_layer() vectorizer.vectors_to_images(weights, '3_hidden_layer_linear') ############################################################ # (b) Sigmoid transform function for the hidden layer # ############################################################ net_3sig = NeuralNet(3, 'sigmoid') net_3sig.train(paths) weights = net_3sig.input_weights_of_hidden_layer() vectorizer.vectors_to_images(weights, '3_hidden_layer_sigmoid') ############################################################ # Change the size of hidden layer to 6 and retrain #
class AutoEncoder:
"""
Autoencoders, also called autoassociators or Diabolo networks are used to learn
efficient coding of high-dimensional data. They are used to learn the distribution
of inputs itself.
Intuitively speaking, they try to find out structures within the data
to effectively represent it in lower dimensions while maintaining the ability
to reproduce it. They produce similar results as to PCA with only one layer.
Autoencoders have structure of neural networks and are fully connected. The number of neurons
in the output and the input layer are the same, intuitively. Back-propagation can be used
to learn the weights and biases but given the high depth, gradients reaching the lower layers
almost vanish, thus making it learn only the averaged out outputs.
The way to handle it is to first pre-train it as layers of RBMs. Then use the weights and biases
as the initial weights for the neural networks and then use back-propagation to fine-tune.
A detailed introduction to autoencoders is available in this paper by Youshua Bengio
http://www.iro.umontreal.ca/~lisa/pointeurs/TR1312.pdf
"""
def __init__(self, layer_units):
num_layers = len(layer_units)
rbms = []
for i in range(num_layers - 1):
rbms.append(RBM(layer_units[i], layer_units[i + 1]))
self.layer_units = layer_units
self.num_layers = num_layers
self.rbms = rbms
self.ann = NeuralNet(layer_units + list(reversed(layer_units))[1:])
def train_as_rbm(self, data, max_epoch=50001, threshold=0.005,
grad_threshold=0.0001, learning_rate=0.1):
"""
Pre-training the autoencoder network as stacked RBM.
Uses contrastive divergence on all layers one-by-one, treating them as RBMs.
Solves problems of vainishing gradient and local minimas for training as
neural networks.
@type data: numpy matrix
@param data: matrix containing the set of inputs to train on.
@type max_epochs: int
@param max_epochs: maximum iterations to run
@type threshold: float
@param threshold: threshold for error to stop training
@type grad_threshold: float
@param grad_threshold: threshold for gradient's norm to stop training
@type learning_rate: float
@type learning_rate: learning rate to use
@rtype None
"""
layer_units = self.layer_units
num_layers = self.num_layers
rbms = self.rbms
layer_data = data
for i in range(num_layers - 1):
layer_rbm = rbms[i]
layer_rbm.train(layer_data, max_epoch, threshold, grad_threshold,
learning_rate)
layer_data = layer_rbm.run_visible(layer_data)
def run_rbms(self, data, give_probs=False):
"""
Runs all the RBMs forward and backward to get outputs.
@type data: numpy matrix
@param data: inputs to train on
@type give_probs: bool
@param give_probs: whether to run backwards as probability instead of
stochastic binary
@rtype tuple of list of numpy matrices
@return contains all layers' outputs, forward and backward
"""
layer_units = self.layer_units
num_layers = self.num_layers
rbms = self.rbms
outputs = [data]
for i in range(num_layers - 1):
layer_rbm = rbms[i]
outputs.append(layer_rbm.run_visible(outputs[-1]))
reverse_outputs = [outputs[-1]]
for i in range(num_layers - 2, -1, -1):
layer_rbm = rbms[i]
hidden_output = layer_rbm.run_hidden(reverse_outputs[-1], give_probs)
reverse_outputs.append(hidden_output)
return (outputs, reverse_outputs)
def rbm_to_neural_net(self):
"""
Use the weights from RBMs to initialize a neural network
Weights are used such that they are mirrored after the middle layer,
formed by the highest level RBM.
Forward biases from RBMs are used in lower layers
and backward ones in higher layers.
@rtype None
"""
ann_weights = []
ann_biases = []
for rbm in self.rbms:
ann_weights.append(rbm.weights[1:, 1:])
ann_biases.append(rbm.weights[0:1, 1:])
for rbm in reversed(self.rbms):
ann_weights.append(numpy.transpose(rbm.weights[1:, 1:]))
ann_biases.append(numpy.transpose(rbm.weights[1:, 0:1]))
self.ann.weights = ann_weights
self.ann.biases = ann_biases
def train_as_neural_net(self, data, max_epoch=50001, threshold=0.01,
grad_threshold=0.0001, learning_rate=0.05,
weight_decay=0.001, target_sparsity=0.5,
sparsity_weight=0.001):
"""
Runs back-propagation treating the net as a neural network using back-propagation.
Generally to be used after pre-training as RBMs, to avoid local minima and
vanishing gradient issues.
@type data: numpy matrix
@param data: inputs to train on
@type max_epoch: int
@param max_epoch: max number of iterations for training
@type threshold: float
@param threshold: error threshold to stop training at
@type grad_threshold: float
@param grad_threshold: threshold for gradient's norm to stop training
@type learning_rate: float
@param learning_rate: learning rate for training
@type weight_decay: float
@param weight_decay: penalty for high weights
@type target_sparsity: float
@param target_sparsity: value for sparsity to be matched
@type sparsity_weight: float
@param sparsity_weight: weight for sparsity term
@rtype None
"""
self.ann.train(data, data, max_epoch, threshold, grad_threshold,
learning_rate, weight_decay,
target_sparsity, sparsity_weight)
def run_neural_net(self, data):
"""
Runs a forward step treating net as neural net
@type data: numpy matrix
@param data: input to run on
@rtype numpy matrix
@return output of the net
"""
return self.ann.forward_step(data)
def get_encoding(self, data):
"""
Gets the encoding from the middle layer of net
@type data: numpy matrix
@param data: input to run on
@rtype numpy matrix
@return encoding vector
"""
weights = self.ann.weights
biases = self.ann.biases
forward = data
for i in range(self.num_layers - 1):
weight_sum = numpy.dot(forward, weights[i]) + biases[i]
forward = scipy.special.expit(weight_sum)
return forward
pass
PLAYER *= -1
wins = p1
losses = p2
draws = n - (wins + losses)
# print "one player done"
return wins, losses, draws
if __name__ == '__main__':
PLAYER = 1
p1 = 0
p2 = 0
n = 1000
for i in range(n):
nn_player = NeuralNet()
PLAYER = 1
game = Game()
while game.check_status() == 10: # The game continues
av = game.available_moves()
# print av
if PLAYER == -1:
move = nn_player.forward_pass(game.linear_board())
# print move
else:
move = random.choice(av)
# print move, "MOVE"
game.play(move, PLAYER)
status = game.check_status()
if status == 1:
# print "Player 1 has won"
def main(args):
if not args["--random"]:
random.seed(123)
np.random.seed(123)
train_csv=args["<train-csv>"]
if not is_file(train_csv):
return
prediction_csv=args["<prediction-csv>"]
if not is_file(prediction_csv):
return
target=args["<target-csv>"]
if target and not is_file(target):
return
try:
trials=int(args["--trials"])
except ValueError:
print_color("Bad value for trials.",COLORS.RED)
return
try:
batch_size=int(args["--batch"])
except ValueError:
print_color("Bad value for batch.",COLORS.RED)
return
try:
learn_rate=float(args["--learn-rate"])
except ValueError:
print_color("Bad value for learn rate.",COLORS.RED)
return
try:
final_learn_rate=float(args["--final-learn-rate"])
except ValueError:
print_color("Bad value for final learn rate.",COLORS.RED)
return
try:
interval=int(args["--timer"])
except ValueError:
print_color("Bad value for timer interval.",COLORS.RED)
return
try:
sizes=[int(i) for i in args["--sizes"].split(",")]
except ValueError:
print_color("Bad value for sizes.",COLORS.RED)
return
try:
validation_ratio=float(args["--validation-ratio"])
except ValueError:
print_color("Bad value for validation ratio.",COLORS.RED)
return
print_color("Opening file: %s"%train_csv,COLORS.YELLOW)
X_train,Y_train,X_valid,Y_valid=get_data_2csv(train_csv,prediction_csv,
validation_ratio,normalize=args["--normalize"])
if validation_ratio==1 and args["--validate"]:
X_valid,Y_valid=X_train,Y_train
if sizes[0]!=len(X_train[0]):
print_color("Bad 'sizes' parameter for this input data. sizes[0]=%s len(X[0])=%s"%(sizes[0],len(X_train[0])),COLORS.RED)
return
start_time=time.time()
print_color("Initializing neural net.",COLORS.GREEN)
nn=NeuralNet(sizes,learning_rate=learn_rate,final_learning_rate=final_learn_rate,
verbose=args["--verbose"],timer_interval=interval,
logging=args["--logging"])
nn.train(X_train,Y_train,trials,batch_size=batch_size)
report=0
if args["--validate"]:
print_color("Starting validation.",COLORS.GREEN)
report=nn.show_report(X_train,Y_train,X_valid,Y_valid)
if args["--report"]:
if not report:
report=nn.get_report(X_train,Y_train,X_valid,Y_valid)
report["validation ratio"]=validation_ratio
report["normalized"]=args["--normalize"]
report["random"]=args["--random"]
report["duration"]=time.time()-start_time
save_report(report)
if target:
raise NotImplementedError
print_color("Making predictions.",COLORS.GREEN)
nn.make_predictions_csv(target)
print_color("Done after %s seconds."%round(time.time()-start_time,1),COLORS.GREEN)
if status == 1:
# print "Player 1 has won"
p1 += 1
elif status == -1:
# print "Player 2 has won"
p2 += 1
elif status == 0:
# print "Game was a draw"
pass
PLAYER *= -1
board_current = game.linear_board()
print board_current[0:3]
print board_current[3:6]
print board_current[6:9]
wins = p1
losses = p2
draws = n - (wins + losses)
return wins, losses, draws
if __name__ == '__main__':
f = open("player_genomes/best_genome.txt", 'rb').read()
data = f.split('\n')[:-1]
w1, w2, w3, nx, n1, n2, ny, fit = parse_genome(data)
nn_p = NeuralNet()
nn_p.load_from_genome(w1, w2, w3, nx, n1, n2, ny, fit)
print play_a_game(nn_p, 1)
'''
[X - X]
[X O -]
[O - O]'''
train_labels = np.load("train_labels.pkl")
# split to obtain train and test set
x_train, x_test, y_train, y_test = train_test_split(train_features, train_labels, test_size=0.33)
# network topology
n_inputs = train_features.shape[1]
n_outputs = 10
n_hiddens_nodes = 200
n_hidden_layers = 1
# specify activation functions per layer
activation_functions = [tanh_function] * n_hidden_layers + [sigmoid_function]
# initialize the neural network
network = NeuralNet(n_inputs, n_outputs, n_hiddens_nodes, n_hidden_layers, activation_functions)
# start training on test set one
learning_rate = 0.001
plot_step = 5000
pred_epochs = np.arange(0, x_train.shape[0], plot_step)
errors = network.train(x_train, y_train, learning_rate, pred_epochs=pred_epochs)
plt.plot(errors)
plt.savefig("nn_errors.png")
# save the trained network
# network.save_pkl_to_file( "trained_configuration.pkl" )
# load a stored network configuration
# network = NeuralNet.load_pkl_from_file( "trained_configuration.pkl" )
