def train():
epochs = 5
learning_rate = .001
niter = 0
losses = []
moving_loss = 0
smoothing_constant = .01
# 训练
for e in range(epochs):
total_loss = 0
for data, label in data_iter():
with autograd.record():
output = net(data)
loss = square_loss(output, label)
loss.backward()
SGD(params, learning_rate)
total_loss += nd.sum(loss).asscalar()
# 记录每读取一个数据点后，损失的移动平均值的变化；
niter += 1
curr_loss = nd.mean(loss).asscalar()
moving_loss = (1 - smoothing_constant) * moving_loss + (
smoothing_constant) * curr_loss
# correct the bias from the moving averages
est_loss = moving_loss / (1 - (1 - smoothing_constant)**niter)
if (niter + 1) % 100 == 0:
losses.append(est_loss)
print(
"Epoch %s, batch %s. Moving avg of loss: %s. Average loss: %f"
% (e, niter, est_loss, total_loss / num_examples))
def train():
for epoch in range(5):
train_loss = 0.
train_acc = 0.
for data, label in train_data:
label = label.as_in_context(ctx)
with autograd.record():
output = net(data)
loss = softmax_cross_entropy(output, label)
loss.backward()
SGD(params, learning_rate / batch_size)
train_loss += nd.mean(loss).asscalar()
train_acc += accuracy(output, label)
test_acc = evaluate_accuracy(test_data, net, ctx)
print("Epoch %d. Loss: %f, Train acc %f, Test acc %f" %
(epoch, train_loss / len(train_data),
train_acc / len(train_data), test_acc))
def train():
learning_rate = .1
for epoch in range(10):
train_loss = 0.
train_acc = 0.
for data, label in train_data:
with autograd.record():
output = net(data)
loss = cross_entropy(output, label)
loss.backward()
# 将梯度做平均，这样学习率会对batch size不那么敏感
SGD(params, learning_rate / batch_size)
train_loss += nd.mean(loss).asscalar()
train_acc += accuracy(output, label)
test_acc = evaluate_accuracy(test_data, net)
print("Epoch %d. Loss: %f, Train acc %f, Test acc %f" %
(epoch, train_loss / len(train_data),
train_acc / len(train_data), test_acc))
from utils import SGD, accuracy, evaluate_accuracy
from mxnet import gluon
softmax_cross_entropy = gluon.loss.SoftmaxCrossEntropyLoss()
learning_rate = .2
print('length of train data', len(train_data))
for epoch in range(2):
train_loss = 0.
train_acc = 0.
i = 0
for data, label in train_data:
i = i + 1
with autograd.record():
output = net(data, verbose=False)
loss = softmax_cross_entropy(output, label)
loss.backward()
SGD(params, learning_rate/batch_size)
train_loss += nd.mean(loss).asscalar()
train_acc += accuracy(output, label)
test_acc = evaluate_accuracy(test_data, net)
print("Epoch %d. Loss: %f, train_acc: %f, test acc %f."%(epoch, train_loss / len(train_data), train_acc / len(train_data), test_acc))
print('batch numbers :', i)
#print('train_data', train_data.shape)
def train(self):
#need to put into function
if not os.path.exists("./" + param_dir):
os.mkdir(param_dir)
for test in range(self.num_test):
fit_list = []
iteration_list = []
plt.ion()
plt.show()
#set up environment
env = gym.make(self.env)
if self.continuous_action == True:
action_space = env.action_space.shape[0]
else:
action_space = env.action_space.n
state_space = env.observation_space.low.size
param_dict = {}
#get param for the len
best_reward = 0
bbnp = bb_numpy(action_space,state_space,self.max_length,continuous_action = self.continuous_action,state_renormalize = self.state_renormalize)
state = np.zeros(state_space)[None,...]
bbnp.forward_propagate(state,init = True)
#initialize param
param = np.array(bbnp.get_flat_param())
SGD_ = SGD(param, self.lr)
cma_es = cma.CMAEvolutionStrategy(param,self.sigma,{'popsize': self.num_perturbations,})
for iteration in range(self.iterations):
ts = time.time()
cma_param = np.array(cma_es.ask())
if self.method_type == 'CDPP':
if iteration == 0:
X = np.random.randn(self.num_perturbations*3,len(param))
cond_indices = cond_kdpp([], X, k = self.num_perturbations)
self.buffer = X[cond_indices]
else:
dists = np.linalg.norm(self.buffer-param,axis=1)
num_closest= int(self.perc_reuse*self.num_perturbations)
closest_indices = dists.argsort()[:num_closest]
reused_samples = self.buffer[closest_indices]
X = np.random.randn(self.num_perturbations*3,len(param)) + param
cond_indices = cond_kdpp(self.buffer[closest_indices],X,k=(self.num_perturbations-num_closest))
self.buffer = np.vstack((self.buffer[closest_indices],X[cond_indices]))
all_indices = []
queue = Queue()
num_workers = []
num_perts = self.num_perturbations
shared_amt = self.num_perturbations//self.num_cpu
if self.noise_type == 'CDPP' and iteration!=0:
num_perts = self.num_perturbations - int(self.perc_reuse*self.num_perturbations)
shared_amt = (self.num_perturbations - int(self.perc_reuse*self.num_perturbations))//self.num_cpu
while num_perts > shared_amt:
num_perts -= shared_amt
num_workers.append(shared_amt)
num_workers.append(num_perts)
start_indices = [0]
# print('num_workers=',num_workers)
for i in range(1,len(num_workers)):
start_indices.append(start_indices[i-1]+num_workers[i-1])
cma_param_slicer = [0]
cma_param_slicer.extend(num_workers)
cma_param_slicer = np.cumsum(cma_param_slicer)
seed_id = np.random.randint(np.iinfo(np.int32(10)).max, size=len(num_workers))
workers = [Process(target = self._do_work,args = (queue,bbnp,param,action_space,state_space,self.max_length,seed_id[i],num_workers[i],env,self.continuous_action,cma_param[cma_param_slicer[i]:cma_param_slicer[i+1],:],start_indices[i])) for i in range(len(seed_id))]
for worker in workers:
worker.start()
results = [queue.get() for p in workers]
# Swapping this with the above line so deadlock is avoided
for worker in workers:
worker.join()
if self.noise_type == 'CDPP':
if iteration != 0:
old_pert_fitness = pert_fitness[closest_indices]
old_anti_pert_fitness = anti_pert_fitness[closest_indices]
pert_fitness,anti_pert_fitness,seed_id = get_info_summary(results)
pert_fitness = np.array(pert_fitness)[...,None]
anti_pert_fitness = np.array(anti_pert_fitness)[...,None]
if self.noise_type == 'CDPP':
if iteration != 0:
pert_fitness = np.vstack((old_pert_fitness,pert_fitness))
anti_pert_fitness = np.vstack((old_anti_pert_fitness,anti_pert_fitness))
if self.noise_type in ['Gaussian','Hadamard']:
noises = get_noise_matrices(seed_id,num_workers,len(param),self.sigma,self.noise_type)
#record average_fit
average_fit = np.sum(pert_fitness)/self.num_perturbations
fit_list.append(average_fit)
iteration_list.append(iteration)
#dynamic plot the graph
plt.plot(iteration_list,fit_list,'r')
plt.draw()
plt.pause(0.3)
#Ranking best
if self.method_type == 'Rank':
top_ind = np.sort(np.argsort(pert_fitness,axis =0)[-self.best:][::-1],axis = 0).flatten()
pert_fitness = pert_fitness[top_ind]
gradient = (1 / len(top_ind) / self.sigma * (noises[top_ind,:].T@pert_fitness)).flatten()
SGD_gradient = SGD_.get_gradients(gradient)
param = param + SGD_gradient
print('param',param)
#Vanilla
elif self.method_type == 'Vanilla':
gradient = (1 / self.num_perturbations / self.sigma * (noises.T@pert_fitness)).flatten()
SGD_gradient = SGD_.get_gradients(gradient)
param = param + SGD_gradient
#CMA
elif self.method_type == 'CMA':
cma_es.tell(cma_param,-pert_fitness[:,0] - compute_weight_decay(0.01,cma_param))
param = cma_es.result[5] # mean of all perturbations - for render and save - not used to update new space
#ARS
elif self.method_type == 'ARS':
fb_fitness = np.hstack((pert_fitness,anti_pert_fitness))
top_ind = (np.argsort(np.max(fb_fitness,axis = 1,keepdims = True),axis = 0)[-self.best:][::-1]).flatten()
fit_diff = pert_fitness - anti_pert_fitness
reward_noise = np.std(np.vstack((pert_fitness,anti_pert_fitness)))
fit_diff = fit_diff[top_ind]
gradient = (1 / len(top_ind) / self.sigma/reward_noise * (noises[top_ind,:].T@fit_diff)).flatten()
SGD_gradient = SGD_.get_gradients(gradient)
param = param + SGD_gradient
#CDPP
elif self.method_type == 'CDPP':
cond_noise = self.buffer - param
if iteration != 0:
noises = np.vstack((reused_samples,cond_noise))
else:
noises = cond_noise
top_ind = np.sort(np.argsort(pert_fitness,axis =0)[-self.best:][::-1],axis = 0).flatten()
best_pert_fitness = pert_fitness[top_ind]
gradient = (1 / self.num_perturbations / self.sigma * ((self.buffer - param)[top_ind,:].T@best_pert_fitness)).flatten()
param = param + self.lr * gradient
if iteration % self.video_save_interval == 0 and iteration !=0:
normal = Normalizer(state_space)
video_env = gym.wrappers.Monitor(env, './videos/' + str(self.env) + '/'+ str(self.method_type) + '_perturbations_' + str(self.num_perturbations) + '_' +'state_renormalize_' + str(self.state_renormalize)+ '_Simga_' + str(self.sigma) + "_best_" + str(self.best) + "_iter_" +str(iteration) + "_test_" + str(self.test))
bbnp.roll_out(param,video_env,self.env,normal,render = True)
print("-" * 100)
te = time.time()
#print the results
print('iteration: {} | average_fit: {} | # params: {} | time: {:2.2f}s'.format(iteration,average_fit,len(param),te-ts))
self.save_param(path,name,param,average_fit,iteration)
patches_dist_labels_val, patches_color_labels_val
]
else:
y_paths = [patches_tr_lb_h]
val_paths = [patches_val_lb_h]
rows = args.patch_size
cols = args.patch_size
channels = 3
# Define optimizer
if args.optimizer == 'adam':
optm = Adam(lr=args.learning_rate, beta_1=0.9)
elif args.optimizer == 'sgd':
optm = SGD(lr=args.learning_rate, momentum=0.8)
# Define Loss
print('=' * 60)
if args.loss == 'cross_entropy':
print('Using Cross Entropy')
# loss = "categorical_crossentropy"
loss = tf.keras.losses.CategoricalCrossentropy()
loss_bound = tf.keras.losses.BinaryCrossentropy()
loss_reg = tf.keras.losses.MeanSquaredError()
elif args.loss == "tanimoto":
print('Using Tanimoto Dual Loss')
loss = Tanimoto_dual_loss()
loss_bound = Tanimoto_dual_loss()
loss_reg = Tanimoto_dual_loss()
else:
kernel_params = {'n_rand_feat': 10}
get_phi = construct_phi_for_kernel(kernel, kernel_params)
# - model
num_particles = 10
theta, forward = LeNet5(
batch_size=batch_size,
num_particles=num_particles,
)
@jit
def loss(theta, x, y):
yhat = forward(theta, x)
return cross_entropy(y, yhat)
optimizer = SGD(0.001)
grad_loss = jit(grad(loss))
# SVGD training
for epoch in range(100):
for i, (x, y) in tqdm_(train_loader):
g = get_phi(theta, grad_loss(theta, x.numpy(), y.numpy()))
theta = optimizer.update(theta, g)
test_acc = []
for i, (x, y) in tqdm_(test_loader):
yhat = forward(theta, x.numpy())
nll = cross_entropy(y.numpy(), yhat)
pred = yhat.mean(axis=0)
H = 300
model = SimpleNet(D_in, H, D_out)
'''
(3) Training
'''
## Evaluation
def evaluation(model, X, Y):
pred = model.forward(X)
result = OH2label(pred) == Y
result = list(result)
return result.count(1), X.shape[0]
optim = SGD(model.get_params(), lr=0.0001, reg=0.00003)
criterion = CrossEntropyLoss()
batch_size = 64
EPOCH = 5
BATCH = int(X_train.shape[0] / batch_size)
for e in range(EPOCH):
## shuffle data
index = [i for i in range(X_train.shape[0])]
random.shuffle(index)
X_train = X_train[index, :]
Y_train = Y_train[index]
for b in range(BATCH):
## get batch, covert to one-hot
X_batch, Y_batch = get_batch(X_train, Y_train, batch_size, b)
h2 = h2.flatten()
h3_linear = nd.dot(h2, w3) + b3
h3 = nd.relu(h3_linear)
h4_linear = nd.dot(h3, w4) + b4
return h4_linear
batch_size = 256
train_data, test_data = load_data_fashion_mnist(batch_size=batch_size)
softmax_xentropy = gluon.loss.SoftmaxCrossEntropyLoss()
leanring_rate = 0.2
epochs = 5
for epoch in range(epochs):
train_loss = 0.
train_acc = 0.
for data, label in train_data:
with autograd.record():
output = net(data)
loss = softmax_xentropy(output, label)
loss.backward()
SGD(params, leanring_rate / batch_size)
train_loss += nd.mean(loss).asscalar()
train_acc += accuracy(output, label)
test_acc = evaluate_accuracy(test_data, net)
print('epoch %s train accuracy %s test accuracy %s' %
(epoch, train_acc / len(train_data), test_acc))
return nd.mean(output.argmax(axis=1) == label).asscalar()
def evaluate_accuracy(data_iterator, net_func):
acc = 0.
for data, label in data_iterator:
output = net_func(data)
acc += accuracy(output, label)
return acc / len(data_iterator)
LearningRate = .1
for Epoch in range(5):
TrainLoss = 0.
TrainAcc = 0.
for Data, Label in TrainData:
with autograd.record():
Output = net(Data)
Loss = cross_entropy(Output, Label)
Loss.backward()
# 将梯度做平均，这样学习率会对batch size不那么敏感
SGD(Params, LearningRate / BatchSize)
TrainLoss += nd.mean(Loss).asscalar()
TrainAcc += accuracy(Output, Label)
TestAcc = evaluate_accuracy(TestData, net)
print("Epoch %d. Loss: %f, Train acc %f, Test acc %f" % (
Epoch, TrainLoss / len(TrainData), TrainAcc / len(TrainData), TestAcc))
# net(data,verbose=True)
# break
from mxnet import autograd as autograd
from utils import SGD, accuracy, evaluate_accuracy
from mxnet import gluon
epochs = 3
lr = 0.2
softmax_cross_entropy = gluon.loss.SoftmaxCrossEntropyLoss()
for epoch in range(epochs):
train_acc = 0.
train_loss = 0.
for data, label in train_data:
label = label.as_in_context(ctx)
with autograd.record():
output = net(data)
loss = softmax_cross_entropy(output, label)
loss.backward()
SGD(params, lr / batch_size)
train_loss += nd.mean(loss).asscalar()
train_acc += accuracy(output, label)
test_acc = evaluate_accuracy(test_data, net, ctx)
print('Epoch %d. train loss: %f, train acc: %f, test acc: %f' %
(epoch, train_loss / len(train_data), train_acc / len(train_data),
test_acc))
}
val_fit = {
"segmentation": patches_val_ref_aug_h,
"boundary": patches_bound_labels_val,
"distance": patches_dist_labels_val,
"color": patches_color_labels_val
}
#%%
start_time = time.time()
exp = 2
rows = patch_size
cols = patch_size
adam = Adam(lr=0.0001, beta_1=0.9)
sgd = SGD(lr=0.01, momentum=0.8)
batch_size = 8
#weights = [0.5, 0.5, 0]
weights = [weight0, weight1, 0]
print(f"Weights: {weights}")
print('=' * 60)
loss = weighted_categorical_crossentropy(weights)
#loss = 'categorical_crossentropy'
if args.resunet_a == True:
if args.multitasking:
print('Multitasking enabled!')