def main():
args = arg()
model = SiameseNetwork()
if args.gpu >= 0:
chainer.cuda.get_device_from_id(args.gpu).use()
model.to_gpu()
optimizer = chainer.optimizers.Adam()
optimizer.setup(model)
train, test = chainer.datasets.get_mnist(ndim=3)
train_iter = chainer.iterators.SerialIterator(train, args.batch)
test_iter = chainer.iterators.SerialIterator(test, args.batch,
repeat=False, shuffle=False)
updater = SiameseUpdater(train_iter, optimizer, device=args.gpu)
trainer = training.Trainer(updater, (args.epoch, 'epoch'), out=args.out)
trainer.extend(extensions.LogReport())
trainer.extend(extensions.PrintReport(
['epoch', 'elapsed_time', 'main/loss']))
trainer.extend(extensions.ProgressBar())
trainer.extend(plot_testdata(model, test, args.batch), trigger=(1, 'epoch'))
trainer.run()
def main():
dataset_path = 'gen_simulated_data'
use_augmentation = False
learning_rate = 10e-4
batch_size = 32
# Learning Rate multipliers for each layer
learning_rate_multipliers = {}
learning_rate_multipliers['Conv1'] = 1
learning_rate_multipliers['Conv2'] = 1
learning_rate_multipliers['Conv3'] = 1
learning_rate_multipliers['Conv4'] = 1
#learning_rate_multipliers['Conv5'] = 1
learning_rate_multipliers['Dense1'] = 1
# l2-regularization penalization for each layer
l2_penalization = {}
l2_penalization['Conv1'] = 1e-2
l2_penalization['Conv2'] = 1e-2
l2_penalization['Conv3'] = 1e-2
l2_penalization['Conv4'] = 1e-2
#l2_penalization['Conv5'] = 1e-2
l2_penalization['Dense1'] = 1e-4
# Path where the logs will be saved
tensorboard_log_path = './logs/siamese_net_lr10e-4'
siamese_network = SiameseNetwork(
dataset_path=dataset_path,
learning_rate=learning_rate,
batch_size=batch_size,
use_augmentation=use_augmentation,
learning_rate_multipliers=learning_rate_multipliers,
l2_regularization_penalization=l2_penalization,
tensorboard_log_path=tensorboard_log_path)
# Final layer-wise momentum (mu_j in the paper)
momentum = 0.9
# linear epoch slope evolution
momentum_slope = 0.01
# support_set指支持一次"图像验证"的图像集合，即1：N image evaluation的N
support_set_size = 20
# evaluation时需要进行验证的图像数目
number_of_tasks_per_bucket = 20
evaluate_each = 500
number_of_train_iterations = 1000000
validation_accuracy = siamese_network.train_siamese_network(
number_of_iterations=number_of_train_iterations,
support_set_size=support_set_size,
final_momentum=momentum,
momentum_slope=momentum_slope,
evaluate_each=evaluate_each,
model_name='siamese_net_lr10e-4')
if validation_accuracy == 0:
evaluation_accuracy = 0
else:
# Load the weights with best validation accuracy
siamese_network.model.load_weights('.models/siamese_net_lr10e-4.h5')
evaluation_accuracy = siamese_network.chars_loader.one_shot_test(
siamese_network.model, support_set_size,
number_of_tasks_per_bucket, False)
print('Final Evaluation Accuracy = ' + str(evaluation_accuracy))
def __init__(self):
self.siamese_network = SiameseNetwork()
self.input_shape = self.INPUT_SHAPE
self.triplet_model = self.siamese_network.model
self.train_siamese_network()
self.model = self.trained_model()
self.save_model_weights()
def main():
dataset_path = 'Omniglot Dataset'
use_augmentation = True
learning_rate = 10e-4
#batch_size = 128
batch_size = 256
# Learning Rate multipliers for each layer
learning_rate_multipliers = {}
learning_rate_multipliers['Conv1'] = 1
learning_rate_multipliers['Conv2'] = 1
learning_rate_multipliers['Conv3'] = 1
learning_rate_multipliers['Conv4'] = 1
learning_rate_multipliers['Dense1'] = 1
# l2-regularization penalization for each layer
l2_penalization = {}
l2_penalization['Conv1'] = 1e-2
l2_penalization['Conv2'] = 1e-2
l2_penalization['Conv3'] = 1e-2
l2_penalization['Conv4'] = 1e-2
l2_penalization['Dense1'] = 1e-4
# Path where the logs will be saved
tensorboard_log_path = './logs/siamese_net_lr10e-4'
siamese_network = SiameseNetwork(
dataset_path=dataset_path,
learning_rate=learning_rate,
batch_size=batch_size,
use_augmentation=use_augmentation,
learning_rate_multipliers=learning_rate_multipliers,
l2_regularization_penalization=l2_penalization,
tensorboard_log_path=tensorboard_log_path)
# Final layer-wise momentum (mu_j in the paper)
momentum = 0.9
# linear epoch slope evolution
momentum_slope = 0.01
support_set_size = 20
evaluate_each = 1000
#number_of_train_iterations = 250000
number_of_train_iterations = 125000
validation_accuracy = siamese_network.train_siamese_network(
number_of_iterations=number_of_train_iterations,
support_set_size=support_set_size,
final_momentum=momentum,
momentum_slope=momentum_slope,
evaluate_each=evaluate_each,
model_name='siamese_net_lr10e-4')
if validation_accuracy == 0:
evaluation_accuracy = 0
else:
# Load the weights with best validation accuracy
siamese_network.model.load_weights('./models/siamese_net_lr10e-4.h5')
evaluation_accuracy = siamese_network.omniglot_loader.one_shot_test(
siamese_network.model, 20, 40, False)
print('Final Evaluation Accuracy = ' + str(evaluation_accuracy))
def main():
learning_rate = 10e-4
batch_size = 32
epochs = 15
height = 256
width = 256
# Learning Rate multipliers for each layer
learning_rate_multipliers = {}
learning_rate_multipliers['Conv1'] = 1
learning_rate_multipliers['Conv2'] = 1
learning_rate_multipliers['Conv3'] = 1
learning_rate_multipliers['Conv4'] = 1
learning_rate_multipliers['Dense1'] = 1
# l2-regularization penalization for each layer
l2_penalization = {}
l2_penalization['Conv1'] = 1e-2
l2_penalization['Conv2'] = 1e-2
l2_penalization['Conv3'] = 1e-2
l2_penalization['Conv4'] = 1e-2
l2_penalization['Dense1'] = 1e-4
# Path where the logs will be saved
tensorboard_log_path = './logs/siamese_net_lr10e-4'
siamese_network = SiameseNetwork(
learning_rate=learning_rate,
batch_size=batch_size,
epochs=epochs,
learning_rate_multipliers=learning_rate_multipliers,
l2_regularization_penalization=l2_penalization,
tensorboard_log_path=tensorboard_log_path)
# Data
os.chdir("/data8t/ljq/whale_data/whale_data/siamese_networks/")
train_data_temp = np.load('training_data.npy')
train_data = [train_data_temp[0]]
train_data.append(train_data_temp[1])
train_label = np.load('training_label.npy')
val_data_temp = np.load('validation_data.npy')
val_data = [val_data_temp[0]]
val_data.append(val_data_temp[1])
val_label = np.load('validation_label.npy')
# train_base_num = 1000
# train_data = [np.zeros((train_base_num * 6, height, width, 3)) for j in range(2)]
# train_label = np.zeros((train_base_num * 6, 1))
# val_data = [np.ones((train_base_num * 2, height, width, 3)) for j in range(2)]
# val_label = np.ones((train_base_num * 2, 1))
siamese_network.train_siamese_network(model_name='siamese_net_whale',
train_data=train_data,
train_label=train_label,
val_data=val_data,
val_label=val_label)
def main():
# test = Image.open("./data/1.pgm")
# test.show()
# print (test)
print("Training starts...")
folder_dataset = dset.ImageFolder(root=Config.training_dir)
siamese_dataset = Contrastive_Dataset(imageFolderDataset=folder_dataset,
transform=transforms.Compose([
transforms.Resize((100, 100)),
transforms.ToTensor()
]),
should_invert=False)
train_dataloader = DataLoader(siamese_dataset,
shuffle=True,
num_workers=8,
batch_size=Config.train_batch_size)
net = SiameseNetwork()
criterion = ContrastiveLoss()
optimizer = optim.Adam(net.parameters(), lr=0.0005)
counter = []
loss_history = []
iteration_number = 0
for epoch in range(0, Config.train_number_epochs):
for i, data in enumerate(train_dataloader, 0):
img0, img1, label = data
img0, img1, label = Variable(img0), Variable(img1), Variable(label)
output1, output2 = net(img0, img1)
optimizer.zero_grad()
loss_contrastive = criterion(output1, output2, label)
loss_contrastive.backward()
optimizer.step()
if i % 10 == 0:
print("Epoch number {}\n Current loss {}\n".format(
epoch, loss_contrastive.data[0]))
iteration_number += 10
counter.append(iteration_number)
loss_history.append(loss_contrastive.data[0])
torch.save(net.state_dict(), "trained_weights.pt")
# save_checkpoint({
# 'epoch': epoch + 1,
# })
show_plot(counter, loss_history)
def main():
dataset_path = 'data/split_dataset_NOMASK/train'
model_name = 'model_train_NOMASK'
use_augmentation = True
learning_rate = 1e-2
batch_size = 16
# Learning Rate multipliers for each layer
learning_rate_multipliers = {'Conv1': 1, 'Conv2': 1, 'Conv3': 1, 'Conv4': 1, 'Dense1': 1}
# l2-regularization penalization for each layer
l2_penalization = {'Conv1': 1e-2, 'Conv2': 1e-2, 'Conv3': 1e-2, 'Conv4': 1e-2, 'Dense1': 1e-4}
# Path where the logs will be saved
tensorboard_log_path = f'./logs/{model_name}'
siamese_network = SiameseNetwork(
dataset_path=dataset_path,
learning_rate=learning_rate,
batch_size=batch_size, use_augmentation=use_augmentation,
learning_rate_multipliers=learning_rate_multipliers,
l2_regularization_penalization=l2_penalization,
tensorboard_log_path=tensorboard_log_path
)
# Final layer-wise momentum (mu_j in the paper)
momentum = 0.9
# linear epoch slope evolution
momentum_slope = 0.01
support_set_size = 20
evaluate_each = 500
number_of_train_iterations = 30000
validation_accuracy = siamese_network.train_siamese_network(number_of_iterations=number_of_train_iterations,
support_set_size=support_set_size,
final_momentum=momentum,
momentum_slope=momentum_slope,
evaluate_each=evaluate_each,
model_name=model_name)
if validation_accuracy == 0:
evaluation_accuracy = 0
else:
# Load the weights with best validation accuracy
siamese_network.model.load_weights(f'./models/{model_name}.h5')
evaluation_accuracy = siamese_network.omniglot_loader.one_shot_test(siamese_network.model, 20, 40, False)
print('Final Evaluation Accuracy = ' + str(evaluation_accuracy))
def test(model_path, data_path, target_tag, pair_num, save_result=False):
model = SiameseNetwork()
model.load_state_dict(
torch.load(model_path, map_location='cpu')['model_state_dict'])
result = []
for i in range(0, pair_num):
im1, im2, is_same, first_image, second_image = random_data_generator(
data_path, target_tag)
predict = model(im1.unsqueeze(0), im2.unsqueeze(0)).item()
result.append((first_image, second_image, predict, is_same))
if save_result:
plt.figure(figsize=(4, 12), dpi=300)
plt.subplots_adjust(left=None,
bottom=None,
right=None,
top=None,
wspace=None,
hspace=1.5)
for i, item in enumerate(result):
first_image, second_image, predict, is_same = item[0], item[
1], item[2], item[3]
img1 = Image.open(first_image)
img2 = Image.open(second_image)
img1 = img1.convert('RGB')
img2 = img2.convert('RGB')
plt.subplot(pair_num, 2, 2 * i + 1)
plt.axis('off')
plt.title('Label=%s, Prediction=%s' % (str(is_same), str(predict)),
fontsize=4)
plt.imshow(img1)
plt.subplot(pair_num, 2, 2 * i + 2)
plt.axis('off')
plt.title('Real Label=%s' % second_image.split('/')[-2],
fontsize=4)
plt.imshow(img2)
plt.savefig('./result.png', dpi=300)
return result
def run_combination(l, bs, ep, pat, md, seed, train_path, test_path):
"""
This function gets the parameters and run the experiment.
:return: loss - loss on the testing set, accuracy - accuracy on the testing set
"""
# file types
model_save_type = 'h5'
# files paths
initialize_seed(seed)
parameters_name = f'seed_{seed}_lr_{l}_bs_{bs}_ep_{ep}_val_{validation_size}_' \
f'es_{early_stopping}_pa_{pat}_md_{md}'
print(f'Running combination with {parameters_name}')
# A path for the weights
load_weights_path = os.path.join(
data_path, 'weights', f'weights_{parameters_name}.{model_save_type}')
siamese = SiameseNetwork(seed=seed,
width=WIDTH,
height=HEIGHT,
cells=CEELS,
loss=loss_type,
metrics=['accuracy'],
optimizer=Adam(lr=l),
dropout_rate=0.4)
siamese.fit(weights_file=load_weights_path,
train_path=train_path,
validation_size=validation_size,
batch_size=bs,
epochs=ep,
early_stopping=early_stopping,
patience=pat,
min_delta=md)
loss, accuracy = siamese.evaluate(test_file=test_path,
batch_size=bs,
analyze=True)
print(f'Loss on Testing set: {loss}')
print(f'Accuracy on Testing set: {accuracy}')
# predict_pairs(model)
return loss, accuracy
def main():
parser = argparse.ArgumentParser()
parser.add_argument('-img', type=str, default='test.jpg')
# parser.add_argument('-ques', type=str, default='What vechile is in the picture?')
args = parser.parse_args()
img = args.img
folder_dataset_test = dset.ImageFolder(root=Config.testing_dir)
siamese_dataset = SiameseNetworkDataset(
imageFolderDataset=folder_dataset_test,
transform=transforms.Compose(
[transforms.Resize((100, 100)),
transforms.ToTensor()]),
should_invert=False)
img = Image.open(img)
img = img.convert("L")
transform = transforms.Compose(
[transforms.Resize((100, 100)),
transforms.ToTensor()])
img = transform(img)
# Add a dimension to image to make padding possible.
img = img[None, :, :, :]
test_dataloader = DataLoader(siamese_dataset, num_workers=3, batch_size=1)
dataiter = iter(test_dataloader)
net = SiameseNetwork()
net.load_state_dict(torch.load("trained_weights.pt"))
for i in range(4):
_, x1, label2 = next(dataiter)
concatenated = torch.cat((img, x1), 0)
output1, output2 = net(Variable(img), Variable(x1))
euclidean_distance = F.pairwise_distance(output1, output2)
imshow(
torchvision.utils.make_grid(concatenated), 'Dissimilarity: \
{:.2f}'.format(euclidean_distance.data.numpy()[0][0]))
class TrainModel():
def __init__(self):
self.siamese_network = SiameseNetwork()
self.input_shape = self.INPUT_SHAPE
self.triplet_model = self.siamese_network.model
self.train_siamese_network()
self.model = self.trained_model()
self.save_model_weights()
def train_siamese_network(self, batchsize=32, no_of_epochs=20):
triplet_pairs = self.siamese_network.get_data()
call_backs = siamese_network.get_callback()
self.triplet_model.fit(x=[
triplet_pairs[:, 0, :], triplet_pairs[:, 1, :], triplet_pairs[:,
2, :]
],
y=np.zeros(shape=(triplet_pairs.shape[0],
12288)),
batch_size=batchsize,
callbacks=call_backs,
epochs=no_of_epochs,
shuffle=True,
validation_split=0.14)
def trained_model(self):
triplet_model_required_layers = self.triplet_model.layers[-2]
anchor_input = Input(self.input_shape, name='anchor_input')
encoded_anchor = triplet_model_required_layers(anchor_input)
return Model(anchor_input, encoded_anchor)
def save_model_weights(self):
# serialize model to JSON
model_json = self.model.to_json()
with open(MODEL_WEIGHT_PATH + "model.json", "w") as json_file:
json_file.write(model_json)
# serialize weights to HDF5
self.model.save_weights(MODEL_WEIGHT_PATH + "model.h5")
print("Saved model to disk")
import matplotlib.pyplot as plt
import numpy as np
import scikitplot as skplt
import sklearn
from omniglot_loader import OmniglotLoader
from siamese_network import SiameseNetwork
model_wo_tf = './trained_models/wo_transform/model.h5'
model_w_tf = './trained_models/w_transform/model.h5'
if __name__ == '__main__':
# First test case, training without transformations, testing without transformations
omg = OmniglotLoader(use_transformations=False)
network = SiameseNetwork(model_location=model_wo_tf)
y_pred, te_y = network.get_predictions(omg)
y_pred = np.array(y_pred)
te_y = np.array(te_y)
fpr, tpr, _ = skplt.metrics.roc_curve(te_y.flatten(), y_pred.flatten())
auc = sklearn.metrics.roc_auc_score(te_y.flatten(), y_pred.flatten())
# Second test case, training without transformations, testing with transformations
omg = OmniglotLoader(use_transformations=True)
y_pred, te_y = network.get_predictions(omg)
y_pred = np.array(y_pred)
te_y = np.array(te_y)
fpr_te_tf, tpr_te_tf, _ = skplt.metrics.roc_curve(te_y.flatten(),
y_pred.flatten())
auc_te_tf = sklearn.metrics.roc_auc_score(te_y.flatten(), y_pred.flatten())
from torchvision import transforms
from siamese_dataset import SiameseNetworkDataset
from siamese_network import SiameseNetwork
from helpers import imshow
from torchvision.datasets import ImageFolder
from torch.utils.data import DataLoader
from torch.autograd import Variable
import torch.nn.functional as F
class Config():
testing_dir = "/home/wingman2/datasets/personas/test/"
# testing_dir = "/home/wingman2/code/Facial-Similarity-with-Siamese-Networks-in-Pytorch/data/faces/testing/"
model = SiameseNetwork().cuda()
model.load_state_dict(torch.load('/home/wingman2/models/siamese-faces-160.pt'))
model.eval()
data_transforms_test = transforms.Compose(
[transforms.Resize((100, 100)),
transforms.ToTensor()])
folder_dataset_test = ImageFolder(root=Config.testing_dir)
siamese_dataset = SiameseNetworkDataset(imageFolderDataset=folder_dataset_test,
transform=data_transforms_test,
should_invert=False)
test_dataloader = DataLoader(siamese_dataset,
num_workers=8,
batch_size=1,
shuffle=True)
def bayesian_optimization_function(x):
dataset_path = 'Omniglot Dataset'
current_learning_rate = float(x[:, 0])
current_momentum = float(x[:, 1])
current_momentum_slope = float(x[:, 2])
current_conv1_multiplier = float(x[:, 3])
current_conv2_multiplier = float(x[:, 4])
current_conv3_multiplier = float(x[:, 5])
current_conv4_multiplier = float(x[:, 6])
current_dense1_multiplier = float(x[:, 7])
current_conv1_penalization = float(x[:, 8])
current_conv2_penalization = float(x[:, 9])
current_conv3_penalization = float(x[:, 10])
current_conv4_penalization = float(x[:, 11])
current_dense1_penalization = float(x[:, 12])
model_name = 'siamese_net_lr_' + str(current_learning_rate) + \
'momentum_' + str(current_momentum) + '_slope_' + \
str(current_momentum_slope)
global current_model_number
current_model_number += 1
tensorboard_log_path = './logs/' + str(current_model_number)
# Learning Rate multipliers for each layer
learning_rate_multipliers = {}
learning_rate_multipliers['Conv1'] = current_conv1_multiplier
learning_rate_multipliers['Conv2'] = current_conv2_multiplier
learning_rate_multipliers['Conv3'] = current_conv3_multiplier
learning_rate_multipliers['Conv4'] = current_conv4_multiplier
learning_rate_multipliers['Dense1'] = current_dense1_multiplier
# l2-regularization penalization for each layer
l2_penalization = {}
l2_penalization['Conv1'] = current_conv1_penalization
l2_penalization['Conv2'] = current_conv2_penalization
l2_penalization['Conv3'] = current_conv3_penalization
l2_penalization['Conv4'] = current_conv4_penalization
l2_penalization['Dense1'] = current_dense1_penalization
K.clear_session()
siamese_network = SiameseNetwork(
dataset_path=dataset_path,
learning_rate=current_learning_rate,
batch_size=32,
use_augmentation=True,
learning_rate_multipliers=learning_rate_multipliers,
l2_regularization_penalization=l2_penalization,
tensorboard_log_path=tensorboard_log_path)
current_model_number += 1
support_set_size = 20
evaluate_each = 500
number_of_train_iterations = 100000
validation_accuracy = siamese_network.train_siamese_network(
number_of_iterations=number_of_train_iterations,
support_set_size=support_set_size,
final_momentum=current_momentum,
momentum_slope=current_momentum_slope,
evaluate_each=evaluate_each,
model_name=model_name)
if validation_accuracy == 0:
evaluation_accuracy = 0
else:
# Load the weights with best validation accuracy
siamese_network.model.load_weights('models/' + model_name + '.h5')
evaluation_accuracy = siamese_network.data_loader.one_shot_test(
siamese_network.model, 20, 40, False)
print("Model: " + model_name + ' | Accuracy: ' +
str(evaluation_accuracy))
K.clear_session()
return 1 - evaluation_accuracy
#测试集
siamese_dataset_test = SiameseNetworkDataset(sample_path=Config.sample_test_path,
transform=transforms.Compose([transforms.ToTensor()])
,should_invert=False)
print("len(siamese_dataset_test) = ", siamese_dataset_test.__len__())
test_dataloader = DataLoader(siamese_dataset_test,
shuffle=False,#siamese_dataset 重排后再取数据
num_workers=5,
batch_size=360)
#模型训练
net = SiameseNetwork() #网络结构
criterion = ContrastiveLoss() #损失函数
optimizer = optim.Adam(net.parameters(),lr = 0.0005) #参数优化函数
train_loss_history = []
test_loss_history = []
for epoch in range(0, Config.train_number_epochs):#整个样本集的迭代
list_loss_epoch_c = []
for i, data in enumerate(train_dataloader,0):#batch迭代
img0, img1, label = data
optimizer.zero_grad() #模型参数梯度设为0
output1,output2 = net(img0,img1)
loss_contrastive = criterion(output1,output2,label)
loss_contrastive.backward() #反向传播
