def main():
########################################################################
######################## training parameters ###########################
########################################################################
parser = argparse.ArgumentParser()
parser.add_argument('--dataset',
type=str,
default='ImageNet',
metavar='N',
help='dataset to run experiments on')
parser.add_argument(
'--batch_size',
type=int,
default=256,
metavar='N',
help=
'input batch size for training (default: 256; note that batch_size 64 gives worse performance for imagenet, so don\'t change this. )'
)
parser.add_argument('--exp',
type=str,
default='default',
metavar='N',
help='name of experiment')
parser.add_argument('--logits_exp',
type=str,
default='default',
metavar='N',
help='name of experiment containing logits')
parser.add_argument('--no-cuda',
action='store_true',
default=False,
help='disables CUDA training')
parser.add_argument('--seed',
type=int,
default=5021,
metavar='S',
help='random seed (default: 5021)')
parser.add_argument('--lr',
type=float,
default=0.1,
metavar='LR',
help='learning rate (default: 0.01)')
parser.add_argument('--weight_decay',
type=float,
default=5 * 1e-4,
help='weight_decay (default: 1e-5)')
parser.add_argument('--momentum',
type=float,
default=0.9,
metavar='M',
help='SGD momentum (default: 0.5)')
parser.add_argument('--step_size',
type=float,
default=30,
metavar='M',
help='SGD momentum (default: 0.5)')
parser.add_argument('--gamma',
type=float,
default=0.1,
metavar='M',
help='SGD momentum (default: 0.5)')
parser.add_argument(
'--log-interval',
type=int,
default=10,
metavar='N',
help='how many batches to wait before logging training status')
parser.add_argument(
'--stopping_criterion',
type=int,
default=30,
metavar='N',
)
parser.add_argument('--test',
action='store_true',
default=False,
help='test mode')
parser.add_argument('--load_model',
type=str,
default=None,
help='model to initialise from')
args = parser.parse_args()
print("\n==================Options=================")
pprint(vars(args), indent=4)
print("==========================================\n")
use_cuda = not args.no_cuda and torch.cuda.is_available()
# make everything deterministic, reproducible
if (args.seed is not None):
print('Seeding everything with seed {}.'.format(args.seed))
seed_everything(args.seed)
else:
print('Note : Seed is random.')
device = torch.device("cuda" if use_cuda else "cpu")
exp_dir = os.path.join('checkpoint', args.exp)
if not os.path.isdir(exp_dir):
os.makedirs(exp_dir)
kwargs = {'num_workers': 1, 'pin_memory': True} if use_cuda else {}
dataset = args.dataset
num_classes = 1000 if dataset.lower() == 'imagenet' else 365
########################################################################
######################## load data ####################
########################################################################
datadir = './checkpoint/{}'.format(args.logits_exp)
if (not args.test):
data_manyshot = torch.load('{}/results_val_manyshot.pickle'.format(
datadir)) # for experts with reject option
data_mediumshot = torch.load('{}/results_val_mediumshot.pickle'.format(
datadir)) # for experts with reject option
data_fewshot = torch.load('{}/results_val_fewshot.pickle'.format(
datadir)) # for experts with reject option
else:
data_manyshot = torch.load(
'{}/results_test_aligned_manyshot.pickle'.format(
datadir)) # for experts with reject option
data_mediumshot = torch.load(
'{}/results_test_aligned_mediumshot.pickle'.format(
datadir)) # for experts with reject option
data_fewshot = torch.load(
'{}/results_test_aligned_fewshot.pickle'.format(
datadir)) # for experts with reject option
data_general = torch.load(
'{}/results_test_aligned_general.pickle'.format(dataset.lower()))
manyshot_logits = data_manyshot['logits'].clone().detach()
mediumshot_logits = data_mediumshot['logits'].clone().detach()
fewshot_logits = data_fewshot['logits'].clone().detach()
labels = data_manyshot['labels'] if not args.test else data_general[
'labels']
manyshotClassMask, mediumshotClassMask, fewshotClassMask = data_manyshot[
'class_mask'], data_mediumshot['class_mask'], data_fewshot[
'class_mask']
# logit tuning to correct for open set sampling ratio
if (dataset.lower() == 'imagenet'):
manyshot_logits[:, -1] = manyshot_logits[:, -1] - np.log(2 / (1 + 16))
mediumshot_logits[:,
-1] = mediumshot_logits[:, -1] - np.log(2 / (1 + 16))
fewshot_logits[:, -1] = fewshot_logits[:, -1] - np.log(2 / (1 + 16))
else:
manyshot_logits[:, -1] = manyshot_logits[:, -1] - np.log(2 / (1 + 16))
mediumshot_logits[:,
-1] = mediumshot_logits[:, -1] - np.log(2 / (1 + 8))
fewshot_logits[:, -1] = fewshot_logits[:, -1] - np.log(2 / (1 + 8))
manyshot_features = manyshot_logits.data.cpu().numpy()
mediumshot_features = mediumshot_logits.data.cpu().numpy()
fewshot_features = fewshot_logits.data.cpu().numpy()
labels = labels.data.cpu().numpy()
if (not args.test):
train_loader = torch.utils.data.DataLoader(Calibration_Dataset(
orig_txt='./data/{}_LT/{}_LT_train.txt'.format(
args.dataset, args.dataset),
manyshot_features=manyshot_features,
mediumshot_features=mediumshot_features,
fewshot_features=fewshot_features,
labels=labels),
batch_size=args.batch_size,
shuffle=True,
**kwargs)
else:
test_loader = torch.utils.data.DataLoader(
Calibration_Dataset(orig_txt='./data/{}_LT/{}_LT_train.txt'.format(
args.dataset, args.dataset),
manyshot_features=manyshot_features,
mediumshot_features=mediumshot_features,
fewshot_features=fewshot_features,
labels=labels),
batch_size=args.batch_size,
shuffle=False,
**kwargs) # dont shuffle test set as usual
########################################################################
######################## initialise model and optimizer ################
########################################################################
model = CalibrateExperts(args.dataset.lower(), manyshotClassMask,
mediumshotClassMask, fewshotClassMask).cuda()
optimizer = torch.optim.SGD(model.parameters(),
lr=args.lr,
momentum=args.momentum,
weight_decay=args.weight_decay)
scheduler = optim.lr_scheduler.StepLR(optimizer,
step_size=args.step_size,
gamma=args.gamma)
print(
'Using StepLR scheduler with params, stepsize : {}, gamma : {}'.format(
args.step_size, args.gamma))
if (args.test):
pretrained_model = torch.load(args.load_model)
weights = pretrained_model['state_dict_best']['model']
weights = {
k:
weights['module.' + k] if 'module.' + k in weights else weights[k]
for k in model.state_dict()
}
model.load_state_dict(weights) # loading model weights
print('Loaded pretrained model.')
########################################################################
######################## training with early stopping ##################
########################################################################
if (not args.test):
results = vars(args)
results['train_losses'], results['train_accuracies'] = [], []
best_acc, best_epoch = 0, 0
epoch = 1
while (True):
sys.stdout.flush()
train_loss, train_acc = train(args, model, device, train_loader,
optimizer, scheduler, epoch)
results['train_losses'].append(train_loss)
results['train_accuracies'].append(train_acc)
if (train_acc > best_acc):
best_acc = train_acc
best_epoch = epoch
results['best_acc'], results[
'best_epoch'] = best_acc, best_epoch
# save best model
best_model_weights = {}
best_model_weights['model'] = copy.deepcopy(model.state_dict())
model_states = {
'epoch': epoch,
'best_epoch': best_epoch,
'state_dict_best': best_model_weights,
'best_acc': best_acc,
}
torch.save(model_states, os.path.join(exp_dir,
"best_model.pt"))
elif (epoch > best_epoch + args.stopping_criterion):
print('Best model obtained. Error : ', best_acc)
plot_curves(results, exp_dir) # plot
break
savepath = os.path.join(exp_dir, 'results.pickle')
with open(savepath, 'wb') as f:
pickle.dump(results, f)
plot_curves(results, exp_dir) # plot
epoch = epoch + 1
########################################################################
######################## testing ########################
########################################################################
else:
loss, acc, preds = test(args, model, device, test_loader)
if (dataset == 'ImageNet'):
split_ranges = {
'manyshot': [0, 19550],
'medianshot': [19550, 43200],
'fewshot': [43200, 50000],
'all': [0, 50000]
} # imagenet
else:
split_ranges = {
'manyshot': [0, 13200],
'medianshot': [13200, 29400],
'fewshot': [29400, 36500],
'all': [0, 36500]
} # places
for split_name, split_range in split_ranges.items():
gt_target = torch.from_numpy(
labels[int(split_range[0]):int(split_range[1])]).cuda()
split_preds = preds[int(split_range[0]):int(split_range[1])]
correct = split_preds.eq(
gt_target.view_as(split_preds)).sum().item()
accuracy = 100 * (correct / (split_range[1] - split_range[0]))
print('{} accuracy : {:.2f}'.format(split_name, accuracy))
def evaluate(model, load_path, plot):
with open(load_path + 'trained_params_best.npz') as f:
loaded = np.load(f)
blocks_model = Model(model.cost)
params_dicts = blocks_model.get_parameter_dict()
params_names = params_dicts.keys()
for param_name in params_names:
param = params_dicts[param_name]
# '/f_6_.W' --> 'f_6_.W'
slash_index = param_name.find('/')
param_name = param_name[slash_index + 1:]
assert param.get_value().shape == loaded[param_name].shape
param.set_value(loaded[param_name])
if plot:
train_data_stream, valid_data_stream = get_streams(20)
# T x B x F
data = train_data_stream.get_epoch_iterator().next()
cg = ComputationGraph(model.cost)
f = theano.function(cg.inputs, [model.location, model.scale],
on_unused_input='ignore',
allow_input_downcast=True)
res = f(data[1], data[0])
for i in range(10):
visualize_attention(data[0][:, i, :],
res[0][:, i, :], res[1][:, i, :],
image_shape=(512, 512), prefix=str(i))
plot_curves(path=load_path,
to_be_plotted=['train_categoricalcrossentropy_apply_cost',
'valid_categoricalcrossentropy_apply_cost'],
yaxis='Cross Entropy',
titles=['train', 'valid'],
main_title='CE')
plot_curves(path=load_path,
to_be_plotted=['train_learning_rate',
'train_learning_rate'],
yaxis='lr',
titles=['train', 'train'],
main_title='lr')
plot_curves(path=load_path,
to_be_plotted=['train_total_gradient_norm',
'valid_total_gradient_norm'],
yaxis='GradientNorm',
titles=['train', 'valid'],
main_title='GradientNorm')
for grad in ['_total_gradient_norm',
'_total_gradient_norm',
'_/lstmattention.W_patch_grad_norm',
'_/lstmattention.W_state_grad_norm',
'_/lstmattention.initial_cells_grad_norm',
'_/lstmattention.initial_location_grad_norm',
'_/lstmattention/lstmattention_mlp/linear_0.W_grad_norm',
'_/lstmattention/lstmattention_mlp/linear_1.W_grad_norm',
'_/mlp/linear_0.W_grad_norm',
'_/mlp/linear_1.W_grad_norm']:
plot_curves(path=load_path,
to_be_plotted=['train' + grad,
'valid' + grad],
yaxis='GradientNorm',
titles=['train',
'valid'],
main_title=grad.replace(
"_", "").replace("/", "").replace(".", ""))
plot_curves(path=load_path,
to_be_plotted=[
'train_misclassificationrate_apply_error_rate',
'valid_misclassificationrate_apply_error_rate'],
yaxis='Error rate',
titles=['train', 'valid'],
main_title='Error')
print 'plot printed'
def main():
# # CELL 1
# '''
# Imporation des bibliothèques python générales
# '''
# import numpy as np
# import matplotlib.pyplot as plt
# import itertools
# from sklearn.datasets import make_classification
# '''
# Imporation des bibliothèques spécifiques au devoir
# '''
# import utils
# from linear_classifier import LinearClassifier
# from two_layer_classifier import TwoLayerClassifier
# %matplotlib inline
# plt.rcParams['figure.figsize'] = (14.0, 8.0) # set default size of plots
# %load_ext autoreload
# %autoreload 2
# CELL 2
# Générer des données
X_, y_ = make_classification(1000,
n_features=2,
n_redundant=0,
n_informative=2,
n_clusters_per_class=1,
n_classes=3,
random_state=6)
# Centrer et réduire les données (moyenne = 0, écart-type = 1)
mean = np.mean(X_, axis=0)
std = np.std(X_, axis=0)
X_ = (X_ - mean) / std
# Afficher
plt.figure(figsize=(8, 6))
plt.scatter(X_[:, 0], X_[:, 1], c=y_, edgecolors='k', cmap=plt.cm.Paired)
plt.show(block=False)
# CELL 3
num_val = 200
num_test = 200
num_train = 600
np.random.seed(1)
idx = np.random.permutation(len(X_))
train_idx = idx[:num_train]
val_idx = idx[num_train:num_train + num_val]
test_idx = idx[-num_test:]
X_train = X_[train_idx]
y_train = y_[train_idx]
X_val = X_[val_idx]
y_val = y_[val_idx]
X_test = X_[test_idx]
y_test = y_[test_idx]
# Afficher
plt.figure(figsize=(8, 6))
plt.scatter(X_train[:, 0],
X_train[:, 1],
c=y_train,
edgecolors='k',
cmap=plt.cm.Paired)
plt.title('Data train')
plt.show(block=False)
plt.figure(figsize=(8, 6))
plt.scatter(X_val[:, 0],
X_val[:, 1],
c=y_val,
edgecolors='k',
cmap=plt.cm.Paired)
plt.title('Data Validation')
plt.show(block=False)
plt.figure(figsize=(8, 6))
plt.scatter(X_test[:, 0],
X_test[:, 1],
c=y_test,
edgecolors='k',
cmap=plt.cm.Paired)
plt.title('Data test')
plt.show(block=False)
# CELL 4
accu = utils.test_sklearn_svm(X_train, y_train, X_test, y_test)
print('Test accuracy: {:.3f}'.format(accu))
if accu < 0.7:
print(
'ERREUR: L\'accuracy est trop faible. Il y a un problème avec les données. Vous pouvez essayer de refaire le mélange (case ci-haut).'
)
# CELL 5
# En premier, vérifier la prédiction du modèle, la "forward pass"
# 1. Générer le modèle avec des poids W aléatoires
model = LinearClassifier(X_train,
y_train,
X_val,
y_val,
num_classes=3,
bias=True)
# 2. Appeler la fonction qui calcule l'accuracy et la loss moyenne pour l'ensemble des données d'entraînement
_, loss = model.global_accuracy_and_cross_entropy_loss(X_train, y_train)
# 3. Comparer au résultat attendu
loss_attendu = -np.log(
1.0 / 3.0) # résultat aléatoire attendu soit -log(1/nb_classes)
print('Sortie: {} Attendu: {}'.format(loss, loss_attendu))
if abs(loss - loss_attendu) > 0.05:
print('ERREUR: la sortie de la fonction est incorrecte.')
else:
print('SUCCÈS')
# CELL 6
# Vérification: Vous devez pouvoir faire du surapprentissage sur quelques échantillons.
# Si l'accuracy reste faible, votre implémentation a un bogue.
n_check = 5
X_check = X_train[:n_check]
y_check = y_train[:n_check]
model = LinearClassifier(X_check,
y_check,
X_val,
y_val,
num_classes=3,
bias=True)
loss_train_curve, loss_val_curve, accu_train_curve, accu_val_curve = model.train(
num_epochs=10, lr=1.0, l2_reg=0.0)
accu_train_finale = accu_train_curve[-1]
print('Accuracy d\'entraînement, devrait être 1.0: {:.3f}'.format(
accu_train_finale))
if accu_train_finale < 0.9999:
print('ATTENTION: L\'accuracy n\'est pas 100%.')
utils.plot_curves(loss_train_curve, loss_val_curve, accu_train_curve,
accu_val_curve)
else:
print('SUCCÈS')
# CELL 7
# Prenons encore un petit échantillon et testons différentes valeurs de l2_reg
n_check = 5
X_check = X_train[:n_check]
y_check = y_train[:n_check]
model = LinearClassifier(X_check,
y_check,
X_val,
y_val,
num_classes=3,
bias=True)
for l2_r in np.arange(0, 1, 0.05):
loss_train_curve, loss_val_curve, accu_train_curve, accu_val_curve = model.train(
num_epochs=10, lr=1.0, l2_reg=l2_r)
print(
'l2_reg= {:.4f} >> Loss/accuracy d\'entraînement : {:.3f} {:.3f}'.
format(l2_r, loss_train_curve[-1], accu_train_curve[-1]))
# CELL 8
# On instancie et entraîne notre modèle; cette fois-ci avec les données complètes.
model = LinearClassifier(X_train,
y_train,
X_val,
y_val,
num_classes=3,
bias=True)
loss_train_curve, loss_val_curve, accu_train_curve, accu_val_curve = model.train(
lr=0.001, num_epochs=25, l2_reg=0.01)
# Illustration de la loss et de l'accuracy (le % de biens classés) à chaque itération
utils.plot_curves(loss_train_curve, loss_val_curve, accu_train_curve,
accu_val_curve)
print('[Training] Loss: {:.3f} Accuracy: {:.3f}'.format(
loss_train_curve[-1], accu_train_curve[-1]))
print('[Validation] Loss: {:.3f} Accuracy: {:.3f}'.format(
loss_val_curve[-1], accu_val_curve[-1]))
# CELL 9
lr_choices = [1e-2, 1e-1, 1.0, 10.0]
reg_choices = [1e-1, 1e-2, 1e-3, 1e-4, 1e-5, 1e-6]
lr_decay = 0.995 # learning rate is multiplied by this factor after each step
best_accu = -1
best_params = None
best_model = None
best_curves = None
for lr, reg in itertools.product(lr_choices, reg_choices):
params = (lr, reg)
curves = model.train(num_epochs=25,
lr=lr,
l2_reg=reg,
lr_decay=lr_decay)
loss_train_curve, loss_val_curve, accu_train_curve, accu_val_curve = curves
val_accu = accu_val_curve[-1]
if val_accu > best_accu:
print('Best val accuracy: {:.3f} | lr: {:.0e} | l2_reg: {:.0e}'.
format(val_accu, lr, reg))
best_accu = val_accu
best_params = params
best_model = model
best_curves = curves
model = best_model
utils.plot_curves(*best_curves)
# CELL 10
# On ré-entraîne le modèle avec les meilleurs hyper-paramètres
lr, reg = best_params
model.train(num_epochs=25, lr=lr, l2_reg=reg, lr_decay=lr_decay)
pred = model.predict(X_test)
accu = (pred == y_test).mean()
print('Test accuracy: {:.3f}'.format(accu))
# CELL 11
h = 0.01 # contrôle la résolution de la grille
x_min, x_max = X_[:,
0].min() - .5, X_[:,
0].max() + .5 # Limites de la grille
y_min, y_max = X_[:, 1].min() - .5, X_[:, 1].max() + .5
xx, yy = np.meshgrid(np.arange(x_min, x_max, h),
np.arange(y_min, y_max, h)) # Créer la grille
X_predict = np.c_[xx.ravel(),
yy.ravel()] # Convertir la grille en une liste de points
Z = model.predict(X_predict) # Classifier chaque point de la grille
Z = Z.reshape(xx.shape) # Remettre en 2D
plt.figure(figsize=(14, 8))
plt.pcolormesh(
xx, yy, Z,
cmap=plt.cm.Paired) # Colorier les cases selon les prédictions
X_plot, y_plot = X_train, y_train
X_plot, y_plot = X_train, y_train
plt.scatter(X_plot[:, 0],
X_plot[:, 1],
c=y_plot,
edgecolors='k',
cmap=plt.cm.Paired) # Tracer les données
plt.xlim(xx.min(), xx.max())
plt.ylim(yy.min(), yy.max())
plt.title('Frontières de décision')
plt.show(block=False)
# CELL 12
#Choisissez le type de données que vous voulez
# NOTE IMPORTANTE: on vous encourage à tester différentes bases de données. Ceci dit,
# votre solution sera testée avec Ncircles (N=4). Vous devez donc tester cette option.
dataset_type = 'Ncircles'
if dataset_type == 'moons':
X_, y_ = sklearn.datasets.make_moons(n_samples=200, noise=0.5)
num_classes = 2
elif dataset_type == 'gaussian_quantiles':
X_, y_ = sklearn.datasets.make_gaussian_quantiles(n_samples=200,
n_classes=2)
num_classes = 2
elif dataset_type == '4blobs':
d = 4
c1a = np.random.randn(50, 2)
c1b = np.random.randn(50, 2) + (d, d)
c2a = np.random.randn(50, 2) + (0, d)
c2b = np.random.randn(50, 2) + (d, 0)
X_ = np.concatenate([c1a, c1b, c2a, c2b], axis=0)
y_ = np.array([0] * 100 + [1] * 100)
num_classes = 2
elif dataset_type == '2circles':
X_, y_ = sklearn.datasets.make_circles(n_samples=200)
num_classes = 2
elif dataset_type == 'Ncircles':
samples_per_class = 100
num_classes = 4
angles = np.linspace(0, 2 * np.pi, samples_per_class)
radius = 1.0 + np.arange(num_classes) * 0.3
px = np.cos(angles[:, None]) * radius[None, :] # (100, 3)
py = np.sin(angles[:, None]) * radius[None, :] # (100, 3)
X_ = np.stack([px, py], axis=-1).reshape(
(samples_per_class * num_classes, 2))
X_ += np.random.randn(len(X_[:, 0]), 2) / 8
y_ = np.array(list(range(num_classes)) * samples_per_class)
else:
print('Invalid dataset type')
# CELL 13
plt.figure()
plt.scatter(X_[:, 0], X_[:, 1], c=y_, cmap=plt.cm.Paired)
plt.title('Données complètes')
plt.show(block=False)
# CELL 14
train_proportion = 0.5
val_proportion = 0.2
num_train = int(len(X_) * train_proportion)
num_val = int(len(X_) * val_proportion)
np.random.seed(0)
idx = np.random.permutation(len(X_))
train_idx = idx[:num_train]
val_idx = idx[num_train:num_train + num_val]
test_idx = idx[num_train + num_val:]
X_train = X_[train_idx]
y_train = y_[train_idx]
X_val = X_[val_idx]
y_val = y_[val_idx]
X_test = X_[test_idx]
y_test = y_[test_idx]
# CELL 15
# Affichons maintenant les données d'entraînement, de validation et de test.
plt.figure()
plt.scatter(X_train[:, 0], X_train[:, 1], c=y_train, cmap=plt.cm.Paired)
plt.title('Train')
plt.show(block=False)
plt.figure()
plt.scatter(X_val[:, 0], X_val[:, 1], c=y_val, cmap=plt.cm.Paired)
plt.title('Validation')
plt.show(block=False)
plt.figure()
plt.scatter(X_test[:, 0], X_test[:, 1], c=y_test, cmap=plt.cm.Paired)
plt.title('Test')
plt.show(block=False)
# CELL 16
num_hidden_neurons = 10
model = TwoLayerClassifier(X_train,
y_train,
X_val,
y_val,
num_features=2,
num_hidden_neurons=num_hidden_neurons,
num_classes=num_classes)
# CELL 17
# Vérifier que la sortie du réseau initialisé au hasard donne bien une prédiction égale pour chaque classe
num_hidden_neurons = 10
model = TwoLayerClassifier(X_train,
y_train,
X_val,
y_val,
num_features=2,
num_hidden_neurons=num_hidden_neurons,
num_classes=num_classes)
# 2. Appeler la fonction qui calcule l'accuracy et la loss moyenne pour l'ensemble des données d'entraînement
_, loss = model.global_accuracy_and_cross_entropy_loss(X_train, y_train, 0)
# 3. Comparer au résultat attendu
loss_attendu = -np.log(
1.0 /
num_classes) # résultat aléatoire attendu soit -log(1/nb_classes)
print('Sortie: {} Attendu: {}'.format(loss, loss_attendu))
if abs(loss - loss_attendu) > 0.05:
print('ERREUR: la sortie de la fonction est incorrecte.')
else:
print('SUCCÈS')
# CELL 18
# Vérifier que le fait d'augmenter la régularisation L2 augmente également la loss
for l2_r in np.arange(0, 2, 0.1):
_, loss = model.global_accuracy_and_cross_entropy_loss(
X_train, y_train, l2_r)
print(
'l2_reg= {:.4f} >> Loss/accuracy d\'entraînement : {:.3f}'.format(
l2_r, loss))
# CELL 19
# Vérification: Vous devez pouvoir faire du surapprentissage sur quelques échantillons.
# Si l'accuracy reste faible, votre implémentation a un bogue.
n_check = 5
X_check = X_train[:n_check]
y_check = y_train[:n_check]
model = TwoLayerClassifier(X_check,
y_check,
X_val,
y_val,
num_features=2,
num_hidden_neurons=num_hidden_neurons,
num_classes=num_classes)
loss_train_curve, loss_val_curve, accu_train_curve, accu_val_curve = model.train(
num_epochs=200, lr=0.01, l2_reg=0.0)
print('Accuracy d\'entraînement, devrait être 1.0: {:.3f}'.format(
accu_train_curve[-1]))
if accu_train_curve[-1] < 0.98:
print('ATTENTION: L\'accuracy n\'est pas 100%.')
utils.plot_curves(loss_train_curve, loss_val_curve, accu_train_curve,
accu_val_curve)
else:
print('SUCCÈS')
# CELL 20
# Vérifier que le fait d'entraîner avec une régularisation L2 croissante augmente la loss et, éventuellement, diminue l'accuracy
for l2_r in np.arange(0, 1, 0.1):
loss_train_curve, loss_val_curve, accu_train_curve, accu_val_curve = model.train(
num_epochs=200, lr=0.01, l2_reg=l2_r)
print(
'l2_reg= {:.4f} >> Loss/accuracy d\'entraînement : {:.3f} {:.3f}'.
format(l2_r, loss_train_curve[-1], accu_train_curve[-1]))
# CELL 21
# On instancie notre modèle; cette fois-ci avec les données complètes.
num_hidden_neurons = 20
model = TwoLayerClassifier(X_train,
y_train,
X_val,
y_val,
num_features=2,
num_hidden_neurons=num_hidden_neurons,
num_classes=num_classes,
activation='relu')
# CELL 22
loss_train_curve, loss_val_curve, accu_train_curve, accu_val_curve = model.train(
num_epochs=200, lr=1e-2, l2_reg=0.0, momentum=0.5)
# Illustration de la loss et de l'accuracy (le % de biens classés) à chaque itération
utils.plot_curves(loss_train_curve, loss_val_curve, accu_train_curve,
accu_val_curve)
print('[Training] Loss: {:.3f} Accuracy: {:.3f}'.format(
loss_train_curve[-1], accu_train_curve[-1]))
print('[Validation] Loss: {:.3f} Accuracy: {:.3f}'.format(
loss_val_curve[-1], accu_val_curve[-1]))
# CELL 23
# Find the best hyperparameters lr and l2_reg
lr_choices = [1e-4, 1e-3, 1e-2]
reg_choices = [1e-1, 1e-2, 1e-3, 1e-4, 0]
lr_decay = 1.0 # 0.995 # learning rate is multiplied by this factor after each step
best_accu = -1
best_params = None
best_model = None
best_curves = None
for lr, reg in itertools.product(lr_choices, reg_choices):
params = (lr, reg)
curves = model.train(num_epochs=50,
lr=lr,
l2_reg=reg,
lr_decay=lr_decay,
momentum=0.5)
loss_train_curve, loss_val_curve, accu_train_curve, accu_val_curve = curves
val_accu = accu_val_curve[-1]
if val_accu > best_accu:
print('Best val accuracy: {:.3f} | lr: {:.0e} | l2_reg: {:.0e}'.
format(val_accu, lr, reg))
best_accu = val_accu
best_params = params
best_model = model
best_curves = curves
else:
print('accuracy: {:.3f} | lr: {:.0e} | l2_reg: {:.0e}'.format(
val_accu, lr, reg))
model = best_model
utils.plot_curves(*best_curves)
# CELL 24
# On ré-entraîne le modèle avec les meilleurs hyper-paramètres
lr, reg = best_params
print(best_params)
curves = model.train(num_epochs=200, lr=lr, l2_reg=reg, momentum=0.5)
loss_train_curve, loss_val_curve, accu_train_curve, accu_val_curve = curves
pred = model.predict(X_test)
accu = (pred == y_test).mean()
print('Test accuracy: {:.3f}'.format(accu))
utils.plot_curves(*curves)
# CELL 25
# Visualisation des résultats
h = 0.05 # contrôle la résolution de la grille
x_min, x_max = X_[:,
0].min() - .5, X_[:,
0].max() + .5 # Limites de la grille
y_min, y_max = X_[:, 1].min() - .5, X_[:, 1].max() + .5
xx, yy = np.meshgrid(np.arange(x_min, x_max, h),
np.arange(y_min, y_max, h)) # Créer la grille
X_predict = np.c_[xx.ravel(),
yy.ravel()] # Convertir la grille en une liste de points
Z = model.predict(X_predict) # Classifier chaque point de la grille
Z = Z.reshape(xx.shape) # Remettre en 2D
plt.figure(figsize=(14, 8))
plt.pcolormesh(
xx, yy, Z,
cmap=plt.cm.Paired) # Colorier les cases selon les prédictions
X_plot, y_plot = X_, y_
plt.scatter(X_plot[:, 0],
X_plot[:, 1],
c=y_plot,
edgecolors='k',
cmap=plt.cm.Paired) # Tracer les données
plt.xlim(xx.min(), xx.max())
plt.ylim(yy.min(), yy.max())
plt.xticks(())
plt.yticks(())
plt.title('Frontières de décision')
plt.show()
def train_model_1(model,
n_epoch,
labelsdict,
criterion,
optimizer,
device,
trainloader,
validloader,
train_data,
model_name,
model_path,
model_path_best,
loss_graph,
accuracy_graph,
start_epoch=0,
valid_loss=1000):
"""
Commence training of model
model: model used
n_epoch: number of epoch used for training
labelsdict: dictionary containing class names which correnspond to their respective indexes
optimizer: choice of optimizer use for training
device: 'cuda' or 'cpu' (speed up training)
trainloader: input training data split in batches
validloader: input validation data split in batches
train_data: input training data
model_name: name of model indicated
model_path: path where model checkpoint is saved at every epoch
model_path_best: path where model yields best training result is saved (lowest val acc)
loss_graph: path of graph indicating training and validation losses of model is saved
accuracy_graph: path of graph indicating training and validation accuracies of model is saved
start_epoch: indicate start epoch.(where start epoch != 0 when model is not trained from scratch but loaded and retrained)
valid_acc: indicate value of best validation accuracy during point of training
"""
print(
f'Training custom CNN Model to distinguish normal and infected lungs')
print(f'total epochs: {n_epoch}')
if start_epoch != 0:
print(f'Retraining model continuing from epoch {start_epoch+1}')
n_in = next(model.fc2.modules()).in_features
model.to(device)
start = time.time()
epochs = n_epoch
steps = 0
running_loss = 0
running_acc = 0
print_every = len(trainloader)
train_loss = []
val_loss = []
train_acc = []
val_acc = []
val_loss_max = valid_loss
Singapore = pytz.timezone('Asia/Singapore')
for e in range(start_epoch, epochs):
# Make sure training is on
model.train()
for images, labels, path in trainloader: # for each batch
images, labels = images.to(device), labels.to(device)
steps += 1
optimizer.zero_grad()
output = model.forward(images)
# getting loss
loss = criterion(output, labels)
loss.backward()
optimizer.step()
# getting accuracy
ps = torch.exp(output)
equality = (labels == ps.max(dim=1)[1])
running_acc += equality.type(torch.FloatTensor).mean()
running_loss += loss.item()
# At the end of every epoch...
if steps % print_every == 0:
# Eval mode for predictions
model.eval()
# Turn off gradients for validation
with torch.no_grad():
test_loss, accuracy = validation(model, validloader,
criterion, device)
# log results at every epoch
print(
"Epoch: {}/{} - ".format(e + 1, epochs),
"Time: {} ".format(datetime.now(Singapore)),
"Training Loss: {:.3f} - ".format(running_loss /
len(trainloader)),
"Validation Loss: {:.3f} - ".format(test_loss /
len(validloader)),
"Training Accuracy: {:.3f} - ".format(running_acc /
len(trainloader)),
"Validation Accuracy: {:.3f}".format(accuracy /
len(validloader)))
# saving results into a list for plotting
train_loss.append(running_loss / print_every)
val_loss.append(test_loss / len(validloader))
train_acc.append(running_acc / len(trainloader))
val_acc.append(accuracy / len(validloader))
valid_loss = test_loss / len(validloader)
# saving checkpoint
model.n_in = n_in
model.n_out = len(labelsdict)
model.labelsdict = labelsdict
model.optimizer = optimizer
model.optimizer_state_dict = optimizer.state_dict()
model.model_name = model_name
model.loss = criterion
model.val_loss = valid_loss
loss_acc = []
loss_acc.append(train_loss)
loss_acc.append(val_loss)
loss_acc.append(train_acc)
loss_acc.append(val_acc)
model.loss_acc = loss_acc
model.start_epoch = start_epoch
model.epoch = e + 1
path = model_path
path_best = model_path_best
# saving checkpoint model at every epoch
save_checkpoint(model, path)
# saving best model during training, best indicated by highest validation accuracy obtained
if valid_loss <= val_loss_max:
print(
'Validation loss decreased ({:.6f} --> {:.6f}). Saving model ...'
.format(val_loss_max, valid_loss))
# update threshold
val_loss_max = valid_loss
save_checkpoint(model, path_best)
# reset training loss and accuracy after validation, which is used again for subsequent training epoch
running_loss = 0
running_acc = 0
print('model:', model_name, '- epochs:', n_epoch)
print(f"Run time: {(time.time() - start)/60:.3f} min")
# plotting the graph on training and validation loss for model
plot_curves(start_epoch, model.epoch, loss_acc, model_name, loss_graph,
accuracy_graph)
return model
def main(premise_hidden_size,
hypo_hidden_size,
linear_hidden_size,
interaction_type,
device,
kind,
num_layers=1,
bidirectional=True,
kernel_size=3,
lr=1e-4,
test=False,
model_dir='models'):
valid_types = ('cat', 'element_wise_mult')
if interaction_type not in valid_types:
raise ValueError('interaction_type can only be: ', valid_types)
# data
batch_size = 32
save_freq = 500
max_epochs = 40
train_loader, val_loader = data.get_loaders(batch_size, test=test)
# model
embed_size = 300
ind2vec = data.get_table_lookup()
if kind == 'rnn':
model = models.SNLI_Model(ind2vec,
embed_size,
premise_hidden_size,
hypo_hidden_size,
linear_hidden_size,
interaction_type,
device,
kind='rnn',
num_layers=num_layers,
bidirectional=bidirectional)
else:
model = models.SNLI_Model(ind2vec,
embed_size,
premise_hidden_size,
hypo_hidden_size,
linear_hidden_size,
interaction_type,
device,
kind='cnn',
kernel_size=kernel_size)
model = model.to(device)
optimizer = torch.optim.Adam(
[param for param in model.parameters() if param.requires_grad], lr=lr)
loss_fn = torch.nn.CrossEntropyLoss()
model_name = f'{kind}_model_{premise_hidden_size}_{interaction_type}'
model_dir = os.path.join(model_dir, model_name)
train_helper = train_helpers.TrainHelper(device, model, loss_fn, optimizer,
models.batch_params_key,
model_dir, test)
train_loss, val_loss, train_acc, val_acc = train_helper.train_loop(
train_loader, val_loader, max_epochs=max_epochs, save_freq=save_freq)
if 'cpu' in device:
os.makedirs('figures', exist_ok=True)
path = f'figures/{model_name}'
utils.plot_curves(train_loss, val_loss, train_acc, val_acc, path)
utils.save_pkl_data(train_loss, 'train_loss.p', data_dir=model_dir)
utils.save_pkl_data(val_loss, 'val_loss.p', data_dir=model_dir)
utils.save_pkl_data(train_acc, 'train_acc.p', data_dir=model_dir)
utils.save_pkl_data(val_acc, 'val_acc.p', data_dir=model_dir)
def main():
########################################################################
######################## training parameters ###########################
########################################################################
parser = argparse.ArgumentParser()
parser.add_argument('--dataset',
type=str,
default='ImageNet',
metavar='N',
help='dataset to run experiments on')
parser.add_argument(
'--batch_size',
type=int,
default=256,
metavar='N',
help=
'input batch size for training (default: 256; note that batch_size 64 gives worse performance for imagenet, so don\'t change this. )'
)
parser.add_argument('--exp',
type=str,
default='default',
metavar='N',
help='name of experiment')
parser.add_argument('--epochs',
type=int,
default=30,
metavar='N',
help='number of epochs to train (default: 10)')
parser.add_argument('--lr',
type=float,
default=0.2,
metavar='LR',
help='learning rate (default: 0.01)')
parser.add_argument('--weight_decay',
type=float,
default=5 * 1e-4,
help='weight_decay (default: 1e-5)')
parser.add_argument('--momentum',
type=float,
default=0.9,
metavar='M',
help='SGD momentum (default: 0.5)')
parser.add_argument('--step_size',
type=float,
default=10,
metavar='M',
help='SGD momentum (default: 0.5)')
parser.add_argument('--gamma',
type=float,
default=0.1,
metavar='M',
help='SGD momentum (default: 0.5)')
parser.add_argument('--load_model',
type=str,
default=None,
help='model to initialise from')
parser.add_argument('--caffe',
action='store_true',
default=False,
help='caffe pretrained model')
parser.add_argument('--test',
action='store_true',
default=False,
help='run in test mode')
parser.add_argument(
'--ensemble_inference',
action='store_true',
default=True,
help='run in ensemble inference mode'
) # testing is always in ensemble inference mode anyways !
parser.add_argument('--no-cuda',
action='store_true',
default=False,
help='disables CUDA training')
parser.add_argument('--seed',
type=int,
default=5021,
metavar='S',
help='random seed (default: 5021)')
parser.add_argument(
'--log-interval',
type=int,
default=10,
metavar='N',
help='how many batches to wait before logging training status')
parser.add_argument(
'--stopping_criterion',
type=int,
default=15,
metavar='N',
)
parser.add_argument(
'--low_threshold',
type=int,
default=0,
metavar='N',
)
parser.add_argument(
'--high_threshold',
type=int,
default=100000,
metavar='N',
)
parser.add_argument(
'--open_ratio',
type=int,
default=1,
help='ratio of closed_set to open_set data',
)
parser.add_argument(
'--picker',
type=str,
default='generalist',
help=
'dataloader or model picker - experts | generalist : experts uses manyshot, medianshot, fewshot partitioning; \
generalist uses the generalist model',
)
parser.add_argument(
'--num_learnable',
type=int,
default='-1',
help=
'number of learnable layers : -1 ( all ) | 1 ( only classifier ) | 2 ( classifier and last fc ) | 3 - 6 ( classifier, fc + $ind - 2$ resnet super-blocks ) '
)
parser.add_argument('--scheduler',
type=str,
default='stepLR',
help=' stepLR | cosine lr scheduler')
parser.add_argument('--max_epochs',
type=int,
default=None,
help='max number of epochs, for cosine lr scheduler')
args = parser.parse_args()
print("\n==================Options=================")
pprint(vars(args), indent=4)
print("==========================================\n")
use_cuda = not args.no_cuda and torch.cuda.is_available()
# make everything deterministic
if (args.seed is not None):
print('Seeding everything with seed {}.'.format(args.seed))
seed_everything(args.seed)
else:
print('Note : Seed is random.')
device = torch.device("cuda" if use_cuda else "cpu")
exp_dir = os.path.join('checkpoint', args.exp)
if not os.path.isdir(exp_dir):
os.makedirs(exp_dir)
kwargs = {'num_workers': 1, 'pin_memory': True} if use_cuda else {}
# batch size settings : note that these are important for memory and performance reasons
if (args.dataset.lower() == 'imagenet' and args.test):
args.batch_size = 64
elif (args.dataset.lower() == 'imagenet' and not (args.test)):
args.batch_size = 256
elif (args.dataset.lower() == 'places' and not (args.test)):
args.batch_size = 32
elif (args.dataset.lower() == 'places' and args.test):
args.batch_size = 8
########################################################################
######################## load data and pre-trained models ##############
########################################################################
print('Loading train loader.')
train_loader = torch.utils.data.DataLoader(Threshold_Dataset(
root=data_root[args.dataset],
orig_txt='./data/{}_LT/{}_LT_train.txt'.format(args.dataset,
args.dataset),
txt='./data/{}_LT/{}_LT_train.txt'.format(args.dataset, args.dataset),
low_threshold=args.low_threshold,
high_threshold=args.high_threshold,
open_ratio=args.open_ratio,
transform=data_transforms['train'],
picker=args.picker),
batch_size=args.batch_size,
shuffle=True,
**kwargs)
print('Loading val loader.')
val_loader = torch.utils.data.DataLoader(Threshold_Dataset(
root=data_root[args.dataset],
orig_txt='./data/{}_LT/{}_LT_train.txt'.format(args.dataset,
args.dataset),
txt='./data/{}_LT/{}_LT_val.txt'.format(args.dataset, args.dataset),
low_threshold=args.low_threshold,
high_threshold=args.high_threshold,
open_ratio=1,
transform=data_transforms['val'],
picker=args.picker),
batch_size=args.batch_size,
shuffle=True,
**kwargs)
num_classes = train_loader.dataset.num_classes + 1 - int(
args.picker == 'generalist'
) # add 1 for the open/dustbin class if not generalist model
if (args.dataset.lower() == 'imagenet'):
feature_extractor = create_model_resnet10().to(
device) # use this for imagenet
args.lr = 1e-1
else:
feature_extractor = create_model_resnet152(caffe=True).to(
device
) # use this for places. pass caffe=true to load pretrained imagenet model
args.lr = 1e-2
print('Learning rate : {:.4f}'.format(args.lr))
classifier = DotProduct_Classifier(num_classes=num_classes,
feat_dim=512).to(device)
optimizer = torch.optim.SGD(chain(feature_extractor.parameters(),
classifier.parameters()),
lr=args.lr,
momentum=args.momentum,
weight_decay=args.weight_decay)
if (args.scheduler == 'stepLR'):
scheduler = optim.lr_scheduler.StepLR(optimizer,
step_size=args.step_size,
gamma=args.gamma)
print('Using StepLR scheduler with params, stepsize : {}, gamma : {}'.
format(args.step_size, args.gamma))
elif (args.scheduler == 'cosine'):
scheduler = optim.lr_scheduler.CosineAnnealingLR(optimizer,
T_max=args.max_epochs)
print(
'Using CosineAnnealingLR scheduler with params, T_max : {}'.format(
args.max_epochs))
else:
raise Exception('Invalid scheduler argument.')
# load pretrained model
if (args.load_model is not None):
if (not args.caffe):
pretrained_model = torch.load(args.load_model)
weights_feat = pretrained_model['state_dict_best']['feat_model']
weights_feat = {
k: weights_feat['module.' + k] if 'module.' +
k in weights_feat else weights_feat[k]
for k in feature_extractor.state_dict()
}
feature_extractor.load_state_dict(
weights_feat) # loading feature extractor weights
weights_class = pretrained_model['state_dict_best']['classifier']
weights_class = {
k: weights_class['module.' + k] if 'module.' +
k in weights_class else weights_class[k]
for k in classifier.state_dict()
}
if (classifier.state_dict()['fc.weight'].shape ==
weights_class['fc.weight'].shape):
classifier.load_state_dict(
weights_class
) # loading classifier weights if classifiers match
else:
print(
'Classifiers of pretrained model and current model are different with dimensions : ',
classifier.state_dict()['fc.weight'].shape,
weights_class['fc.weight'].shape)
print(
'Loaded pretrained model on entire dataset from epoch : {:d} with acc : {:.4f}'
.format(pretrained_model['best_epoch'],
pretrained_model['best_acc']))
else:
weights_feat = torch.load(args.load_model)
weights_feat = {
k: weights_feat[k]
if k in weights_feat else feature_extractor.state_dict()[k]
for k in feature_extractor.state_dict()
}
feature_extractor.load_state_dict(
weights_feat) # loading feature extractor weights
print('Loaded imagenet pretrained model from Caffe.')
########################################################################
######################## set learnable layers ##########################
########################################################################
if (args.num_learnable == -1):
print('Learning feature extractor and classifier.')
elif (args.num_learnable >= 1 and args.num_learnable <= 6):
if (args.num_learnable == 1):
set_weights('feature_extractor', feature_extractor, False)
set_weights('classifier', classifier, True)
elif (args.num_learnable == 2):
print('Setting feature extractor weights.')
for ind, (name,
layer) in enumerate(feature_extractor.named_children()):
if (ind == 9):
set_weights(name, layer, True)
else:
set_weights(name, layer, False)
set_weights('classifier', classifier, True)
else:
print('Setting feature extractor weights.')
for ind, (name,
layer) in enumerate(feature_extractor.named_children()):
if (ind >= 10 - args.num_learnable):
set_weights(name, layer, True)
else:
set_weights(name, layer, False)
set_weights('classifier', classifier, True)
else:
raise Exception('Invalid num_learnable layers : {}'.format(
args.num_learnable))
########################################################################
######################## training with early stopping ##################
########################################################################
if (not args.test):
results = vars(args)
results['train_losses'] = []
results['train_accuracies'] = []
results['test_losses'] = []
results['test_accuracies'] = []
best_acc, best_epoch = -0.1, 0
epoch = 1
while (True):
sys.stdout.flush()
train_loss, train_err = train(args, feature_extractor, classifier,
device, train_loader, optimizer,
scheduler, epoch)
test_loss, test_err = test(args, feature_extractor, classifier,
device, val_loader)
results['train_losses'].append(train_loss)
results['test_losses'].append(test_loss)
results['train_accuracies'].append(train_err)
results['test_accuracies'].append(test_err)
if (test_err > best_acc):
best_acc = test_err
best_epoch = epoch
results['best_acc'], results[
'best_epoch'] = best_acc, best_epoch
# save best model
best_model_weights = {}
best_model_weights['feat_model'] = copy.deepcopy(
feature_extractor.state_dict())
best_model_weights['classifier'] = copy.deepcopy(
classifier.state_dict())
model_states = {
'epoch': epoch,
'best_epoch': best_epoch,
'state_dict_best': best_model_weights,
'best_acc': best_acc,
}
torch.save(model_states, os.path.join(exp_dir,
"best_model.pt"))
elif (epoch > best_epoch + args.stopping_criterion):
print('Best model obtained. Error : ', best_acc)
plot_curves(results, exp_dir)
break
elif (args.scheduler == 'cosine' and epoch == args.max_epochs):
print('Best model obtained. Error : ', best_acc)
plot_curves(results, exp_dir)
break
savepath = os.path.join(exp_dir, 'results.pickle')
with open(savepath, 'wb') as f:
pickle.dump(results, f)
plot_curves(results, exp_dir)
epoch = epoch + 1
import argparse
from dataloader import load_data
from utils import plot_curves
from classifiers.LinearSVM import LinearSVM
from classifiers.RbfSVM import RbfSVM
if __name__ == "__main__":
parser = argparse.ArgumentParser(description="Choose model")
parser.add_argument("--type",
type=str,
default="Kernel",
help="Linear/Kernel")
parser.add_argument("--norm", type=int, default=1, help="Normalize or not")
args = parser.parse_args()
data = load_data(args.norm)
if args.type == 'Linear':
svm = LinearSVM(data)
else:
svm = RbfSVM(data)
loss_train_list, loss_test, acc_test = svm.run()
plot_curves(loss_train_list)
def run(split_file, pose_data_root, configs, save_model_to=None):
epochs = configs.max_epochs
log_interval = configs.log_interval
num_samples = configs.num_samples
hidden_size = configs.hidden_size
drop_p = configs.drop_p
num_stages = configs.num_stages
# setup dataset
train_dataset = Sign_Dataset(index_file_path=split_file,
split=['train', 'val'],
pose_root=pose_data_root,
img_transforms=None,
video_transforms=None,
num_samples=num_samples)
train_data_loader = torch.utils.data.DataLoader(
dataset=train_dataset, batch_size=configs.batch_size, shuffle=True)
val_dataset = Sign_Dataset(index_file_path=split_file,
split='test',
pose_root=pose_data_root,
img_transforms=None,
video_transforms=None,
num_samples=num_samples,
sample_strategy='k_copies')
val_data_loader = torch.utils.data.DataLoader(
dataset=val_dataset, batch_size=configs.batch_size, shuffle=True)
logging.info('\n'.join(
['Class labels are: '] +
[(str(i) + ' - ' + label)
for i, label in enumerate(train_dataset.label_encoder.classes_)]))
# setup the model
model = GCN_muti_att(input_feature=num_samples * 2,
hidden_feature=num_samples * 2,
num_class=len(train_dataset.label_encoder.classes_),
p_dropout=drop_p,
num_stage=num_stages).cuda()
# setup training parameters, learning rate, optimizer, scheduler
lr = configs.init_lr
# optimizer = optim.SGD(vgg_gru.parameters(), lr=lr, momentum=0.00001)
optimizer = optim.Adam(model.parameters(),
lr=lr,
eps=configs.adam_eps,
weight_decay=configs.adam_weight_decay)
# record training process
epoch_train_losses = []
epoch_train_scores = []
epoch_val_losses = []
epoch_val_scores = []
best_test_acc = 0
# start training
for epoch in range(int(epochs)):
# train, test model
print('start training.')
train_losses, train_scores, train_gts, train_preds = train(
log_interval, model, train_data_loader, optimizer, epoch)
print('start testing.')
val_loss, val_score, val_gts, val_preds, incorrect_samples = validation(
model, val_data_loader, epoch, save_to=save_model_to)
# print('start testing.')
# val_loss, val_score, val_gts, val_preds, incorrect_samples = validation(model,
# val_data_loader, epoch,
# save_to=save_model_to)
logging.info(
'========================\nEpoch: {} Average loss: {:.4f}'.format(
epoch, val_loss))
logging.info('Top-1 acc: {:.4f}'.format(100 * val_score[0]))
logging.info('Top-3 acc: {:.4f}'.format(100 * val_score[1]))
logging.info('Top-5 acc: {:.4f}'.format(100 * val_score[2]))
logging.info('Top-10 acc: {:.4f}'.format(100 * val_score[3]))
logging.info('Top-30 acc: {:.4f}'.format(100 * val_score[4]))
logging.debug('mislabelled val. instances: ' + str(incorrect_samples))
# save results
epoch_train_losses.append(train_losses)
epoch_train_scores.append(train_scores)
epoch_val_losses.append(val_loss)
epoch_val_scores.append(val_score[0])
# save all train test results
np.save('output/epoch_training_losses.npy',
np.array(epoch_train_losses))
np.save('output/epoch_training_scores.npy',
np.array(epoch_train_scores))
np.save('output/epoch_test_loss.npy', np.array(epoch_val_losses))
np.save('output/epoch_test_score.npy', np.array(epoch_val_scores))
if val_score[0] > best_test_acc:
best_test_acc = val_score[0]
best_epoch_num = epoch
torch.save(
model.state_dict(),
os.path.join(
'checkpoints', subset,
'gcn_epoch={}_val_acc={}.pth'.format(
best_epoch_num, best_test_acc)))
utils.plot_curves()
class_names = train_dataset.label_encoder.classes_
utils.plot_confusion_matrix(train_gts,
train_preds,
classes=class_names,
normalize=False,
save_to='output/train-conf-mat')
utils.plot_confusion_matrix(val_gts,
val_preds,
classes=class_names,
normalize=False,
save_to='output/val-conf-mat')
def main(args):
config = cfg.get_default()
cfg.set_params(config, args.config_path, args.set)
cfg.freeze(config, True)
print('- Configuration:')
print(config)
if config.dataset == 'FluidIceShake':
n_groups = 2
n_particles = 348
elif config.dataset == 'RigidFall':
n_groups = 3
n_particles = 192
elif config.dataset == 'MassRope':
n_groups = 2
n_particles = 95
else:
raise ValueError('Unsupported environment')
train_loader = get_dataloader(config, 'train')
valid_loader = get_dataloader(config, 'valid')
# build model
model = PointSetNet(
config.n_frames,
config.pred_hidden,
n_particles,
n_groups,
config.batchnorm,
single_out=config.single_out,
recur_pred=config.recur_pred,
use_temp_encoder=config.use_temp_encoder,
conv_temp_encoder=config.conv_temp_encoder,
temp_embedding_size=config.temp_embedding_size).to(_DEVICE)
print('- Model architecture:')
print(model)
if config.load_path != '':
print('- Loading model from {}'.format(config.load_path))
model.load_state_dict(torch.load(config.load_path))
# build optimizer
optimizer = torch.optim.Adam(model.parameters(), lr=config.lr)
if not config.debug:
print('- Training start')
stats = {
'epoch': [],
'valid_losses': [],
'train_losses': [],
'train_pos_losses': [],
'train_group_losses': [],
'valid_pos_losses': [],
'valid_group_losses': [],
}
best_valid_loss = np.Inf
for epoch in range(config.n_epochs):
# training
print('- Training epoch {:d}'.format(epoch))
epoch_train_losses = []
epoch_train_pos_losses = []
epoch_train_grp_losses = []
pbar = tqdm(train_loader)
did_vis = False
for images, positions, groups in pbar:
(model, optimizer, train_loss,
train_pos_loss, train_grp_loss) = step(
config, model, optimizer, images, positions, groups, True)
epoch_train_losses.append(train_loss)
epoch_train_pos_losses.append(train_pos_loss)
epoch_train_grp_losses.append(train_grp_loss)
pbar.set_description('Train loss {:f}'.format(train_loss))
# visualize training results
if not did_vis \
and config.vis and (epoch + 1) % config.vis_every == 0:
pbar.set_description('Generating video')
visualize(config, model, epoch, n_particles,
images, positions, groups, True)
did_vis = True
train_loss = np.average(epoch_train_losses)
train_pos_loss = np.average(epoch_train_pos_losses)
train_grp_loss = np.average(epoch_train_grp_losses)
print(('- Finish training epoch {:d}, training loss {:f},'
' pos loss {:f}, group loss {:f}').format(
epoch, train_loss, train_pos_loss, train_grp_loss))
# validation
print('- Evaluating epoch {:d}'.format(epoch))
epoch_valid_losses = []
epoch_valid_pos_losses = []
epoch_valid_grp_losses = []
pbar = tqdm(valid_loader)
did_vis = False
for images, positions, groups in pbar:
with torch.no_grad():
(model, _, valid_loss,
valid_pos_loss, valid_grp_loss) = step(
config, model, optimizer,
images, positions, groups, False)
epoch_valid_losses.append(valid_loss)
epoch_valid_pos_losses.append(valid_pos_loss)
epoch_valid_grp_losses.append(valid_grp_loss)
pbar.set_description('Valid loss {:f}'.format(valid_loss))
# visualize validation results
if not did_vis \
and config.vis and (epoch + 1) % config.vis_every == 0:
pbar.set_description('Generating video')
visualize(config, model, epoch, n_particles,
images, positions, groups, False)
did_vis = True
valid_loss = np.average(epoch_valid_losses)
valid_pos_loss = np.average(epoch_valid_pos_losses)
valid_grp_loss = np.average(epoch_valid_grp_losses)
print('- Finish eval epoch {:d}, validation loss {:f}'.format(
epoch, valid_loss))
if valid_loss < best_valid_loss:
print('- Best model')
best_valid_loss = valid_loss
torch.save(model.state_dict(),
os.path.join(config.run_dir, 'checkpoint_best.pth'))
torch.save(model.state_dict(),
os.path.join(config.run_dir, 'checkpoint_latest.pth'))
print()
stats['epoch'].append(epoch)
stats['train_losses'].append(train_loss)
stats['valid_losses'].append(valid_loss)
stats['train_pos_losses'].append(train_pos_loss)
stats['train_group_losses'].append(train_grp_loss)
stats['valid_pos_losses'].append(valid_pos_loss)
stats['valid_group_losses'].append(valid_grp_loss)
with open(os.path.join(config.run_dir, 'stats.json'), 'w') as fout:
json.dump(stats, fout)
# Plot loss curves
plot_dir = os.path.join(config.run_dir, 'curves')
if not os.path.isdir(plot_dir):
os.makedirs(plot_dir)
utils.plot_curves(
x=stats['epoch'],
ys=[stats['train_losses'], stats['valid_losses']],
save_path=os.path.join(plot_dir, 'loss.png'),
curve_labels=['train', 'valid'],
x_label='epoch',
y_label='total_loss',
title='Total loss')
utils.plot_curves(
x=stats['epoch'],
ys=[stats['train_pos_losses'], stats['valid_pos_losses']],
save_path=os.path.join(plot_dir, 'loss_pos.png'),
curve_labels=['train', 'valid'],
x_label='epoch',
y_label='pos_loss',
title='Position loss')
utils.plot_curves(
x=stats['epoch'],
ys=[stats['train_group_losses'], stats['valid_group_losses']],
save_path=os.path.join(plot_dir, 'loss_grp.png'),
curve_labels=['train', 'valid'],
x_label='epoch',
y_label='grp_loss',
title='Grouping loss')
else: # Debug on a single batch
images, positions, groups = next(iter(train_loader))
images = images[:5, :15, ...]
positions = positions[:5, :15, ...]
groups = groups[:5, ...]
for epoch in range(config.n_epochs):
(model, optimizer, train_loss,
train_pos_loss, train_grp_loss) = step(
config, model, optimizer, images, positions, groups, True)
print(train_loss, train_pos_loss, train_grp_loss)
train_f1s = []
test_losses = []
test_accs = []
test_f1s = []
print("Training...")
for epoch in range(1, epochs + 1):
train_loss, train_acc, train_f1, test_loss, test_acc, test_f1 = train(
model, device, ld_train, ld_test, optimizer, epoch, weights)
train_losses.append(train_loss)
train_accs.append(train_acc)
train_f1s.append(train_f1)
test_losses.append(test_loss)
test_accs.append(test_acc)
test_f1s.append(test_f1)
scheduler.step()
# save best checkpoint based on test F1 score
if epoch == 1:
best_test_score = test_f1
if save_dir:
if test_f1 >= best_test_score:
torch.save(model.state_dict(), save_dir)
best_test_score = test_f1
# plot learning curves
plot_curves(train_losses, test_losses, "Loss curves")
plot_curves(train_accs, test_accs, "Accuracy curves")
plot_curves(train_f1s, test_f1s, "F1 curves")
print("Calculating Initial Loss for the Fine Tuning")
val_curve = [
utils.test(dnet, cost, trainloader, validationloader, **training_params)
]
print("Fine Tuning the NN")
for epoch in range(1, args.epochs + 1):
utils.train(dnet, cost, optimizer, trainloader, **training_params)
losses = utils.test(dnet, cost, trainloader, validationloader,
**training_params)
val_curve.append(losses)
print("Done")
autoencoder_fig = utils.plot_curves(val_curveAE,
title='Autoencoder Loss Curves')
fine_tune_fig = utils.plot_curves(val_curve, title='Fine Tuning Loss Curves')
dnet.eval()
dnet.cpu()
if args.name:
fine_tune_fig.savefig("{}_val_curve_fine_tune.png".format(args.name))
autoencoder_fig.savefig("{}_val_curveAE.png".format(args.name))
trainset.save_scaler("{}_standardizer.npz".format(args.name))
th.save(dnet.state_dict(), "{}_fine_tuned_net.pth".format(args.name))
else:
fine_tune_fig.savefig("{}_val_curve_fine_tune.png".format(args.name))
autoencoder_fig.savefig("{}_val_curveAE.png".format(args.name))
trainset.save_scaler("data_standardizer.npz")
th.save(dnet.state_dict(), "{}_fine_tuned_net.pth".format(args.name))
)
print(
f'Val loss: {np.round(valid_loss,6)} \t Val acc: {np.round(valid_acc,4)} \t Val acc pp: {np.round(valid_acc_pp,4)}\n'
)
bvl = np.round(best_valid_loss, 6)
bvl_acc = np.round(val_accuracies[val_losses.index(best_valid_loss)], 4)
if params.post_process:
bvl_acc_pp = np.round(val_accuracies_pp[val_losses.index(best_valid_loss)],
4)
bacc = np.round(np.max(val_accuracies), 4)
print(
f'End of training: best val loss = {bvl} | associated val_acc = {bvl_acc}, val_acc_pp = {bvl_acc_pp} | best val acc = {bacc}\n'
)
plot_curves(train_losses, train_accuracies, val_losses, val_accuracies, params)
if params.post_process:
plot_curves(train_losses, train_accuracies_pp, val_losses,
val_accuracies_pp, params)
### TESTING
params = open_config_file(args.config)
print('Beginning testing...')
test_loader = torch.utils.data.DataLoader(test_dataset,
batch_size=1,
shuffle=False)
# load best weights from training (based on params.tracking value)
best_model = create_model(params)
best_model.load_state_dict(torch.load('best_model.pt'))
best_model = best_model.cuda()
def main():
train_loss_history, train_acc_history, valid_loss_history, valid_acc_history = run()
plot_curves(train_loss_history, train_acc_history, valid_loss_history, valid_acc_history)
