def main(args):
train_set, valid_set, test_set = prepare_dataset(args.data_dir)
train_x, train_y = train_set
test_x, test_y = test_set
# train_y = get_one_hot(train_y, 2)
net = Net([Dense(100), ReLU(), Dense(30), ReLU(), Dense(1)])
model = Model(net=net,
loss=SigmoidCrossEntropyLoss(),
optimizer=Adam(lr=args.lr))
iterator = BatchIterator(batch_size=args.batch_size)
evaluator = AccEvaluator()
loss_list = list()
for epoch in range(args.num_ep):
t_start = time.time()
for batch in iterator(train_x, train_y):
pred = model.forward(batch.inputs)
loss, grads = model.backward(pred, batch.targets)
model.apply_grad(grads)
loss_list.append(loss)
print("Epoch %d time cost: %.4f" % (epoch, time.time() - t_start))
for timer in model.timers.values():
timer.report()
# evaluate
model.set_phase("TEST")
test_y_idx = np.asarray(test_y).reshape(-1)
test_pred = model.forward(test_x)
test_pred[test_pred > 0] = 1
test_pred[test_pred <= 0] = 0
test_pred_idx = test_pred.reshape(-1)
res = evaluator.evaluate(test_pred_idx, test_y_idx)
print(res)
model.set_phase("TRAIN")
def main(args):
train_set, valid_set, test_set = prepare_dataset(args.data_dir)
train_x, train_y = train_set
test_x, test_y = test_set
train_y = get_one_hot(train_y, 10)
if args.model_type == "cnn":
train_x = train_x.reshape((-1, 28, 28, 1))
test_x = test_x.reshape((-1, 28, 28, 1))
if args.model_type == "cnn":
net = Net([
Conv2D(kernel=[5, 5, 1, 8], stride=[2, 2], padding="SAME"),
ReLU(),
Conv2D(kernel=[5, 5, 8, 16], stride=[2, 2], padding="SAME"),
ReLU(),
Conv2D(kernel=[5, 5, 16, 32], stride=[2, 2], padding="SAME"),
ReLU(),
Flatten(),
Dense(10)
])
elif args.model_type == "dense":
net = Net([
Dense(200),
ReLU(),
Dense(100),
ReLU(),
Dense(70),
ReLU(),
Dense(30),
ReLU(),
Dense(10)
])
else:
raise ValueError(
"Invalid argument model_type! Must be 'cnn' or 'dense'")
model = Model(net=net,
loss=SoftmaxCrossEntropyLoss(),
optimizer=Adam(lr=args.lr))
iterator = BatchIterator(batch_size=args.batch_size)
evaluator = AccEvaluator()
loss_list = list()
for epoch in range(args.num_ep):
t_start = time.time()
for batch in iterator(train_x, train_y):
pred = model.forward(batch.inputs)
loss, grads = model.backward(pred, batch.targets)
model.apply_grad(grads)
loss_list.append(loss)
print("Epoch %d time cost: %.4f" % (epoch, time.time() - t_start))
# evaluate
model.set_phase("TEST")
test_pred = model.forward(test_x)
test_pred_idx = np.argmax(test_pred, axis=1)
test_y_idx = np.asarray(test_y)
res = evaluator.evaluate(test_pred_idx, test_y_idx)
print(res)
model.set_phase("TRAIN")
def main(args):
if args.seed >= 0:
random_seed(args.seed)
# data preparing
data_path = os.path.join(args.data_dir, args.file_name)
train_x, train_y, img_shape = prepare_dataset(data_path)
net = Net([
Dense(30),
ReLU(),
Dense(60),
ReLU(),
Dense(60),
ReLU(),
Dense(30),
ReLU(),
Dense(3),
Sigmoid()
])
model = Model(net=net, loss=MSELoss(), optimizer=Adam())
mse_evaluator = MSEEvaluator()
iterator = BatchIterator(batch_size=args.batch_size)
for epoch in range(args.num_ep):
t_start = time.time()
for batch in iterator(train_x, train_y):
preds = model.forward(batch.inputs)
loss, grads = model.backward(preds, batch.targets)
model.apply_grad(grads)
# evaluate
preds = net.forward(train_x)
mse = mse_evaluator.evaluate(preds, train_y)
print(mse)
if args.paint:
# generate painting
preds = preds.reshape(img_shape[0], img_shape[1], -1)
preds = (preds * 255.0).astype("uint8")
filename, ext = os.path.splitext(args.file_name)
output_filename = "output" + ext
output_path = os.path.join(args.data_dir, output_filename)
Image.fromarray(preds).save(output_path)
print("Epoch %d time cost: %.2f" % (epoch, time.time() - t_start))
def main(args):
if args.seed >= 0:
random_seed(args.seed)
# data preparing
train_x, train_y, img_shape = prepare_dataset(args.img)
net = Net([
Dense(30),
ReLU(),
Dense(100),
ReLU(),
Dense(100),
ReLU(),
Dense(30),
ReLU(),
Dense(3),
Sigmoid()
])
model = Model(net=net, loss=MSE(), optimizer=Adam())
iterator = BatchIterator(batch_size=args.batch_size)
for epoch in range(args.num_ep):
for batch in iterator(train_x, train_y):
preds = model.forward(batch.inputs)
loss, grads = model.backward(preds, batch.targets)
model.apply_grad(grads)
# evaluate
preds = net.forward(train_x)
mse = mean_square_error(preds, train_y)
print("Epoch %d %s" % (epoch, mse))
# generate painting
if epoch % 5 == 0:
preds = preds.reshape(img_shape[0], img_shape[1], -1)
preds = (preds * 255.0).astype("uint8")
name, ext = os.path.splitext(args.img)
filename = os.path.basename(name)
out_filename = filename + "-paint-epoch" + str(epoch) + ext
if not os.path.exists(args.output_dir):
os.makedirs(args.output_dir)
out_path = os.path.join(args.output_dir, out_filename)
Image.fromarray(preds).save(out_path)
print("save painting to %s" % out_path)
def test_parameters_change(fake_dataset):
# make sure the parameters does change after apply gradients
# fake dataset
X, y = fake_dataset
# simple model
net = Net([Dense(10), Dense(1)])
loss = MSE()
opt = SGD(lr=1.0)
model = Model(net, loss, opt)
# forward and backward
pred = model.forward(X)
loss, grads = model.backward(pred, y)
# parameters change test
params_before = model.net.params.values
model.apply_grad(grads)
params_after = model.net.params.values
for p1, p2 in zip(params_before, params_after):
assert np.all(p1 != p2)
def main(args):
train_set, valid_set, test_set = prepare_dataset(args.data_dir)
train_x, train_y = train_set
test_x, test_y = test_set
train_y = get_one_hot(train_y, 10)
net = Net([
Dense(784, 200),
ReLU(),
Dense(200, 100),
ReLU(),
Dense(100, 70),
ReLU(),
Dense(70, 30),
ReLU(),
Dense(30, 10)
])
model = Model(net=net,
loss=SoftmaxCrossEntropyLoss(),
optimizer=Adam(lr=args.lr))
iterator = BatchIterator(batch_size=args.batch_size)
evaluator = AccEvaluator()
loss_list = list()
for epoch in range(args.num_ep):
t_start = time.time()
for batch in iterator(train_x, train_y):
pred = model.forward(batch.inputs)
loss, grads = model.backward(pred, batch.targets)
model.apply_grad(grads)
loss_list.append(loss)
t_end = time.time()
# evaluate
test_pred = model.forward(test_x)
test_pred_idx = np.argmax(test_pred, axis=1)
test_y_idx = np.asarray(test_y)
res = evaluator.evaluate(test_pred_idx, test_y_idx)
print("Epoch %d time cost: %.4f\t %s" % (epoch, t_end - t_start, res))
class DQN(object):
def __init__(self, env, args):
self.args = args
# Init replay buffer
self.replay_buffer = deque(maxlen=args.buffer_size)
# Init parameters
self.global_step = 0
self.epsilon = args.init_epsilon
self.state_dim = env.observation_space.shape[0]
self.action_dim = env.action_space.n
self.gamma = args.gamma
self.learning_rate = args.lr
self.batch_size = args.batch_size
self.target_network_update_interval = args.target_network_update
def build_net(self):
q_net = Net([Dense(100), ReLU(), Dense(self.action_dim)])
return q_net
def construct_model(self):
self.q_net = self.build_net()
self.model = Model(net=self.q_net,
loss=MSELoss(),
optimizer=RMSProp(self.args.lr))
# Target network
self.target_q_net = self.build_net()
self.target_q_net.initialize()
def sample_action(self, state, policy):
self.global_step += 1
# Q value of all actions
output_q = self.model.forward([state])[0]
if policy == "egreedy":
if random.random() <= self.epsilon: # random action
return random.randint(0, self.action_dim - 1)
else: # greedy action
return np.argmax(output_q)
elif policy == "greedy":
return np.argmax(output_q)
elif policy == "random":
return random.randint(0, self.action_dim - 1)
def learn(self, state, action, reward, next_state, done):
onehot_action = np.zeros(self.action_dim)
onehot_action[action] = 1
# Store experience in deque
self.replay_buffer.append(
np.array([state, onehot_action, reward, next_state, done]))
if len(self.replay_buffer) > self.batch_size:
self.update_model()
def update_model(self):
if self.global_step % self.target_network_update_interval == 0:
# Update target network. Assign params in q_net to target_q_net
q_net_params = self.q_net.get_parameters()
self.target_q_net.set_parameters(q_net_params)
# Sample experience
minibatch = random.sample(self.replay_buffer, self.batch_size)
# Transpose minibatch
s_batch, a_batch, r_batch, next_s_batch, done_batch = \
np.array(minibatch).T.tolist()
next_s_all_action_Q = self.target_q_net.forward(next_s_batch)
next_s_Q_batch = np.max(next_s_all_action_Q, 1)
# Calculate target_Q_batch
target_Q_batch = []
for i in range(self.batch_size):
done_state = done_batch[i]
if done_state:
target_Q_batch.append(r_batch[i])
else:
target_Q_batch.append(r_batch[i] +
self.gamma * next_s_Q_batch[i])
# Train the network
preds = self.model.forward(np.asarray(s_batch))
preds = np.multiply(preds, a_batch)
targets = np.reshape(target_Q_batch, (-1, 1))
targets = np.tile(targets, (1, 2))
targets = np.multiply(targets, a_batch)
loss, grads = self.model.backward(preds, targets)
self.model.apply_grad(grads)
def main(args):
if args.seed >= 0:
random_seed(args.seed)
train_set, valid_set, test_set = mnist(args.data_dir)
train_x, train_y = train_set
test_x, test_y = test_set
train_y = get_one_hot(train_y, 10)
if args.model_type == "cnn":
train_x = train_x.reshape((-1, 28, 28, 1))
test_x = test_x.reshape((-1, 28, 28, 1))
if args.model_type == "cnn":
# a LeNet-5 model with activation function changed to ReLU
net = Net([
Conv2D(kernel=[5, 5, 1, 6], stride=[1, 1], padding="SAME"),
ReLU(),
MaxPool2D(pool_size=[2, 2], stride=[2, 2]),
Conv2D(kernel=[5, 5, 6, 16], stride=[1, 1], padding="SAME"),
ReLU(),
MaxPool2D(pool_size=[2, 2], stride=[2, 2]),
Flatten(),
Dense(120),
ReLU(),
Dense(84),
ReLU(),
Dense(10)
])
elif args.model_type == "dense":
net = Net([
Dense(200),
ReLU(),
Dense(100),
ReLU(),
Dense(70),
ReLU(),
Dense(30),
ReLU(),
Dense(10)
])
else:
raise ValueError("Invalid argument: model_type")
model = Model(net=net,
loss=SoftmaxCrossEntropy(),
optimizer=Adam(lr=args.lr))
iterator = BatchIterator(batch_size=args.batch_size)
loss_list = list()
for epoch in range(args.num_ep):
t_start = time.time()
for batch in iterator(train_x, train_y):
pred = model.forward(batch.inputs)
loss, grads = model.backward(pred, batch.targets)
model.apply_grad(grads)
loss_list.append(loss)
print("Epoch %d time cost: %.4f" % (epoch, time.time() - t_start))
# evaluate
model.set_phase("TEST")
test_pred = model.forward(test_x)
test_pred_idx = np.argmax(test_pred, axis=1)
test_y_idx = np.asarray(test_y)
res = accuracy(test_pred_idx, test_y_idx)
print(res)
model.set_phase("TRAIN")
def train(args):
# prepare dataset
train_, valid, test = mnist(args.data_dir)
X = np.concatenate([train_[0], valid[0], test[0]])
y = np.concatenate([train_[1], valid[1], test[1]])
fix_noise = get_noise(size=(args.batch_size, args.nz))
loss = SigmoidCrossEntropy()
# TODO: replace mlp with cnn
G = Model(net=mlp_G(),
loss=loss,
optimizer=Adam(args.lr_g, beta1=args.beta1))
D = Model(net=mlp_D(),
loss=loss,
optimizer=Adam(args.lr_d, beta1=args.beta1))
running_g_err, running_d_err = 0, 0
iterator = BatchIterator(batch_size=args.batch_size)
for epoch in range(args.num_ep):
for i, batch in enumerate(iterator(X, y)):
# --- Train Discriminator ---
# feed with real data (maximize log(D(x)))
d_pred_real = D.forward(batch.inputs)
label_real = np.ones_like(d_pred_real)
d_real_err, d_real_grad = D.backward(d_pred_real, label_real)
# feed with fake data (maximize log(1 - D(G(z))))
noise = get_noise(size=(len(batch.inputs), args.nz))
g_out = G.forward(noise)
d_pred_fake = D.forward(g_out)
label_fake = np.zeros_like(d_pred_fake)
d_fake_err, d_fake_grad = D.backward(d_pred_fake, label_fake)
# train D
d_err = d_real_err + d_fake_err
d_grads = d_real_grad + d_fake_grad
D.apply_grad(d_grads)
# ---- Train Generator ---
# maximize log(D(G(z)))
d_pred_fake = D.forward(g_out)
g_err, d_grad = D.backward(d_pred_fake, label_real)
g_grads = G.net.backward(d_grad.wrt_input)
G.apply_grad(g_grads)
running_d_err = 0.9 * running_d_err + 0.1 * d_err
running_g_err = 0.9 * running_g_err + 0.1 * g_err
if i % 100 == 0:
print("epoch-%d iter-%d d_err: %.4f g_err: %.4f" %
(epoch + 1, i + 1, running_d_err, running_g_err))
# sampling
print("epoch: %d/%d d_err: %.4f g_err: %.4f" %
(epoch + 1, args.num_ep, running_d_err, running_g_err))
samples = G.forward(fix_noise)
img_name = "ep%d.png" % (epoch + 1)
if not os.path.exists(args.output_dir):
os.makedirs(args.output_dir)
save_path = os.path.join(args.output_dir, img_name)
save_batch_as_images(save_path, samples)
# save generator
model_path = os.path.join(args.output_dir, args.model_name)
G.save(model_path)
print("Saving generator ", model_path)