def generate_sampler(dataset, sampler_option='random'):
"""
Returns sampler according to the wanted options
:param dataset: (MRIDataset) the dataset to sample from
:param sampler_option: (str) choice of sampler
:return: (Sampler)
"""
df = dataset.df
# To be changed for non-binary classification
count = np.zeros(2)
for idx in df.index:
label = df.loc[idx, "diagnosis"]
key = dataset.diagnosis_code[label]
count[key] += 1
weight_per_class = 1 / np.array(count)
weights = []
for idx, label in enumerate(df["diagnosis"].values):
key = dataset.diagnosis_code[label]
weights += [weight_per_class[key]] * dataset.elem_per_image
if sampler_option == 'random':
return sampler.RandomSampler(weights)
elif sampler_option == 'weighted':
return sampler.WeightedRandomSampler(weights, len(weights))
else:
raise NotImplementedError(
f"The option {sampler_option} for sampler is not implemented")
def reset(self):
"""
Two cases:
1. not hasattr(self, 'split_loader'): Resume from previous training. Create the dataset given the saved split_ix and iterator
2. wrapped: a new epoch, the split_ix and iterator have been updated in the get_minibatch_inds already.
"""
# batch_size is 0, the merge is done in DataLoader class
#print('cpu count: %d'%(multiprocessing.cpu_count()))
if self.split == 'train':
split_sample_weights = self.dataloader.sample_weights[np.array(
self.dataloader.split_ix[self.split])]
mysample_ = sampler.WeightedRandomSampler(
split_sample_weights,
len(self.dataloader.split_ix[self.split]))
mysample = np.array(self.dataloader.split_ix[self.split])[np.array(
list(mysample_))]
self.split_ix = mysample.tolist()
else:
self.split_ix = self.dataloader.split_ix[self.split]
#np.save('data/tmp/%s_ix.npy'%(self.split), np.array(self.split_ix))
self.split_loader = iter(
data.DataLoader(
dataset=self.dataloader,
batch_size=self.dataloader.batch_size,
sampler=self.split_ix[self.dataloader.iterators[self.split]:],
shuffle=False,
pin_memory=False,
num_workers=8,
collate_fn=lambda x: x))
def generate_sampler(dataset, sampler_option="random", n_bins=5):
df = dataset.df
count = np.zeros(n_bins)
values = df[dataset.label].values.astype(float)
thresholds = [
min(values) + i * (max(values) - min(values)) / n_bins
for i in range(n_bins)
]
for idx in df.index:
label = df.loc[idx, dataset.label]
key = max(np.where((label >= thresholds))[0])
count[key] += 1
weight_per_class = 1 / np.array(count)
weights = []
for idx, label in enumerate(df[dataset.label].values):
key = max(np.where((label >= thresholds))[0])
weights += [weight_per_class[key]] * dataset.elem_per_image
if sampler_option == "random":
return sampler.RandomSampler(weights)
elif sampler_option == "weighted":
return sampler.WeightedRandomSampler(weights, len(weights))
else:
raise NotImplementedError(
f"The option {sampler_option} for sampler on regression task is not implemented"
)
def get_dataloader_train(args, root, image_list):
kwargs = {'num_workers': args.num_workers, 'pin_memory': args.pin_memory}
dataset = ds.ClassificationDataset(root,
image_list,
transform=transforms.Compose([
transforms.RandomRotation(3),
transforms.RandomResizedCrop(224, scale=(0.74, 0.78), ratio=(1.0, 1.0)),
transforms.RandomHorizontalFlip(),
transforms.ToTensor(),
transforms.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225])]),
)
prob = np.zeros(args.num_classes)
for i in range(len(dataset)):
cur_class = dataset.labels[i]
prob[cur_class]+=1
prob = 1.0 / prob
reciprocal_weights = np.zeros(len(dataset))
epoch_length = args.epoch_length
for i in range(len(dataset)):
label = dataset.labels[i]
reciprocal_weights[i] = prob[label]
weights = torch.from_numpy(reciprocal_weights)
weighted_sampler = sampler.WeightedRandomSampler(weights , epoch_length)
loader = DataLoader(dataset, batch_size=args.batch_size,
sampler=weighted_sampler, **kwargs)
return loader
def generate_sampler(dataset, sampler_option="random", n_bins=5):
df = dataset.df
n_labels = df[dataset.label].nunique()
count = np.zeros(n_labels)
for idx in df.index:
label = df.loc[idx, dataset.label]
key = dataset.label_fn(label)
count[key] += 1
weight_per_class = 1 / np.array(count)
weights = []
for idx, label in enumerate(df[dataset.label].values):
key = dataset.label_fn(label)
weights += [weight_per_class[key]] * dataset.elem_per_image
if sampler_option == "random":
return sampler.RandomSampler(weights)
elif sampler_option == "weighted":
return sampler.WeightedRandomSampler(weights, len(weights))
else:
raise NotImplementedError(
f"The option {sampler_option} for sampler on classification task is not implemented"
)
def get_train_loaders(path, device, batch_size, workers, class_count):
def to_device(x, y):
return x.to(device), y.to(device, dtype=torch.int64)
train_dataset = extend_dataset(
PickledDataset(path + '/train_gray.p',
transform=get_train_transforms()))
valid_dataset = PickledDataset(path + '/valid_gray.p',
transform=get_test_transforms())
# Use weighted sampler
class_sample_count = np.bincount(train_dataset.labels)
weights = 1 / np.array(
[class_sample_count[y] for y in train_dataset.labels])
samp = sampler.WeightedRandomSampler(weights, 43 * class_count)
train_loader = WrappedDataLoader(
DataLoader(train_dataset,
batch_size=batch_size,
sampler=samp,
num_workers=workers), to_device)
valid_loader = WrappedDataLoader(
DataLoader(valid_dataset,
batch_size=batch_size,
shuffle=False,
num_workers=workers), to_device)
return train_loader, valid_loader
def make_loader(self, batch_size=16, num_workers=0, shuffle=False,
pin_memory=False):
"""
Example:
>>> torch.random.manual_seed(0)
>>> dset = coco_api.CocoDataset(coco_api.demo_coco_data())
>>> self = YoloCocoDataset(dset, train=1)
>>> loader = self.make_loader(batch_size=1)
>>> train_iter = iter(loader)
>>> # training batches should have multiple shapes
>>> shapes = set()
>>> for batch in train_iter:
>>> shapes.add(batch[0].shape[-1])
>>> if len(shapes) > 1:
>>> break
>>> #assert len(shapes) > 1
>>> vali_loader = iter(loaders['vali'])
>>> vali_iter = iter(loaders['vali'])
>>> # vali batches should have one shape
>>> shapes = set()
>>> for batch, _ in zip(vali_iter, [1, 2, 3, 4]):
>>> shapes.add(batch[0].shape[-1])
>>> assert len(shapes) == 1
"""
assert len(self) > 0, 'must have some data'
if shuffle:
if True:
# If the data is not balanced we need to balance it
index_to_weight = self._training_sample_weights()
num_samples = len(self)
index_to_weight = index_to_weight[:num_samples]
sampler = torch_sampler.WeightedRandomSampler(index_to_weight,
num_samples,
replacement=True)
sampler.data_source = self # hack for use with multiscale
else:
sampler = torch_sampler.RandomSampler(self)
resample_freq = 10
else:
sampler = torch_sampler.SequentialSampler(self)
resample_freq = None
# use custom sampler that does multiscale training
batch_sampler = multiscale_batch_sampler.MultiScaleBatchSampler(
sampler, batch_size=batch_size, resample_freq=resample_freq,
)
# torch.utils.data.sampler.WeightedRandomSampler
loader = torch_data.DataLoader(self, batch_sampler=batch_sampler,
collate_fn=nh.data.collate.padded_collate,
num_workers=num_workers,
pin_memory=pin_memory)
if loader.batch_size != batch_size:
try:
loader.batch_size = batch_size
except Exception:
pass
return loader
def sampler_c(dataset):
from torch.utils.data import sampler
train_targets = dataset.classes_for_all_imgs()
# 配置类别采样比例
weights1 = torch.tensor([100, 0.01], dtype=torch.float)
weights2 = torch.tensor([0.01, 100], dtype=torch.float)
print(weights2)
# 为每一个样本采得 采样权重
samples_weights1 = weights1[train_targets]
samples_weights2 = weights2[train_targets]
# 采样器 replacement=True-放回采样
sampler1 = sampler.WeightedRandomSampler(weights=samples_weights1,
num_samples=3 * len(dataset),
replacement=True)
sampler2 = sampler.WeightedRandomSampler(weights=samples_weights2,
num_samples=len(dataset),
replacement=False)
return sampler1, sampler2
def balanced_sampler(train_labels):
'''create a training dataloader for unbalanced class counts'''
# For an unbalanced dataset create a weighted sampler
class_counts, train_samples_weights = make_weights_for_balanced_classes(
train_labels)
# Make a sampler to undersample classes with the highest counts
return sampler.WeightedRandomSampler(train_samples_weights,
len(train_samples_weights),
replacement=True)
def sampler_c(dataset):
from torch.utils.data import sampler
train_targets = dataset.classes_for_all_imgs()
# 配置类别采样比例 4:1
class_sample_couts = [4, 1]
weights = torch.tensor(class_sample_couts, dtype=torch.float)
# 为每一个样本采得 采样权重
samples_weights = weights[train_targets]
# 采样器 replacement=True-放回采样
sampler = sampler.WeightedRandomSampler(weights=samples_weights,
num_samples=len(dataset),
replacement=True)
return sampler
def uniform_sampler(dataset):
nclasses = len(dataset.imgs)
imgs_per_class = [0] * len(dataset.classes)
for _, cl in dataset.imgs:
imgs_per_class[cl] += 1
weight_per_img = [0] * nclasses
for idx, (_, cl) in enumerate(dataset.imgs):
weight_per_img[idx] = nclasses / imgs_per_class[cl]
return sampler.WeightedRandomSampler(torch.DoubleTensor(weight_per_img),
nclasses)
def sample_inference(self, token_seqs):
softmax = nn.Softmax()
batch_size = len(token_seqs)
seq_len = len(token_seqs[0])
encoder_hidden = Variable(self.encoder.initHidden(batch_size)).double()
encoder_output = Variable(self.encoder.initHidden(batch_size)).double()
if use_cuda:
encoder_hidden = encoder_hidden.cuda()
encoder_output = encoder_output.cuda()
hidden = (encoder_output, encoder_hidden)
for i in np.arange(seq_len - 1, 0, -1):
token_batch = np.array(self.embeddings[token_seqs[:, i]])
encoder_input = Variable(torch.from_numpy(token_batch)).view(
1, batch_size, -1).double()
encoder_input = encoder_input.cuda() if use_cuda else encoder_input
hidden = self.encoder(encoder_input, hidden)
encoder_output, encoder_hidden = hidden
token_batch = np.array(self.embeddings[[SOS_TOKEN] * batch_size])
decoder_output = Variable(self.decoder.initHidden(batch_size)).double()
if use_cuda:
decoder_output = decoder_output.cuda()
hidden = (decoder_output, encoder_hidden)
pred_seqs = None
for i in range(250):
decoder_input = Variable(torch.from_numpy(token_batch)).double()
decoder_input = decoder_input.cuda() if use_cuda else decoder_input
decoder_input = decoder_input.squeeze().view(1, batch_size, -1)
decoder_output, hidden = self.decoder(decoder_input, hidden)
output = softmax(decoder_output).data.cpu()
output = output.numpy()
output = output.tolist()
out_iter = sampler.WeightedRandomSampler(output, len(output))
for idx in out_iter:
ni = np.array([[idx]])
break
if pred_seqs is None:
pred_seqs = ni
else:
pred_seqs = np.concatenate((pred_seqs, ni), axis=1)
token_batch = np.array(self.embeddings[ni])
return pred_seqs.tolist()
def train(self, path, verbose=True):
self.data = SplitData(path, self.index)
self.index = self.data.index_dict # new index from non-pretrained version
train_set = self.data('train', random_crop_size=self.random_crop_size)
if self.sample_amount:
self.sampler = sampler.WeightedRandomSampler(torch.ones(len(train_set)), self.sample_amount)
self.train_loader = DataLoader(train_set, batch_size=self.batchsize[0], sampler=self.sampler,
num_workers=self.numloader)
self.val_loader = DataLoader(self.data('val'), batch_size=self.batchsize[1], num_workers=self.numloader)
start_time = time.time()
for epoch in range(self.epochs):
self.current_epoch = epoch
epoch_time = time.time()
train_loss = self.model_iter(self.train_loader)
self.output_list = torch.empty([0]).to(device) # reset
val_loss = self.model_iter(self.val_loader)
epoch_time = time.time() - epoch_time
# codes below are for printing
if (epoch + 1) % 1 == 0 and verbose:
print("Epoch {} finished, current validation loss is {:1.5f}, current train loss is {:1.5f}".format(
epoch + 1,
val_loss, train_loss, timeformat(epoch_time)))
print('It takes {} from beginning'.format(timeformat(time.time() - start_time)))
# codes below are for sustainability
if val_loss < self.minimum_val_loss:
self.minimum_val_loss = val_loss
save_model(self.model, epoch + 1, train_loss, val_loss, self.index,
self.optimizer.param_groups[0]['lr'], time.strftime('%dd-%Hh-%Mm', time.localtime(start_time)))
# codes below are for visualization
loss_dict = {'{}_loss'.format(self.model_name): {'train': train_loss, 'validation': val_loss}}
visualize(loss_dict, epoch, mode='scalar_dict')
img_dict = {'{} results'.format(self.model_name): self.output_list}
if self.model_name == 'all':
nrow = 10
elif self.model_name == 'spn':
nrow = 8
else:
nrow = 3
visualize(img_dict, epoch, mode='image', nrow=nrow)
self.test_unknown('./test')
def test_wegith_sampler():
from torch.utils.data import sampler
weight = list([
1,
] * 30)
weight[:10] = list([
3,
] * 10)
weight_sampler = sampler.WeightedRandomSampler(weight,
num_samples=len(weight))
batch_sampler = sampler.BatchSampler(weight_sampler,
batch_size=4,
drop_last=False)
for indices in batch_sampler:
print(indices)
def init_dataloader(self, dset):
class_sample_count = [len(c) for c in dset.classes]
weights = 1 / torch.Tensor(class_sample_count)
weights[~((weights + 1) != weights)] = 0
weight_per_sample = [0] * len(dset)
for i in range(len(dset)):
c, cind = dset.index_to_sample_d[i]
weight_per_sample[i] = weights[c]
self.trainsampler = sampler.WeightedRandomSampler(
weight_per_sample, len(dset))
self.trainloader = DataLoader(dset,
batch_size=self.opt.bSz,
pin_memory=True,
num_workers=self.opt.n_workers,
sampler=self.trainsampler,
drop_last=True)
def generate_sampler(dataset, sampler_option='random', step=1):
"""
Returns sampler according to the wanted options
:param dataset: (MRIDataset) the dataset to sample from
:param sampler_option: (str) choice of sampler
:param step: (int) step to discretize ages and give a weight per class
:return: (Sampler)
"""
df = dataset.df
min_age = np.min(df.age)
max_age = np.max(df.age)
if (max_age - min_age) % step == 0:
max_age += step
bins = np.arange(min_age, max_age, step)
count = np.zeros(len(bins))
for idx in df.index:
age = df.loc[idx, "age"]
key = np.argmax(np.logical_and(age - step < bins,
age >= bins)).astype(int)
count[key] += 1
# weight_per_class = (1 / np.array(count)) if count.any() != 0 else 0.
weight_per_class = np.zeros_like(count).astype(float)
np.divide(1., count, out=weight_per_class, where=count != 0)
weights = [0] * len(df)
for idx, age in enumerate(df.age.values):
key = np.argmax(np.logical_and(age - 5 <= bins,
age > bins)).astype(int)
weights[idx] = weight_per_class[key]
weights = torch.FloatTensor(weights)
if sampler_option == 'random':
s = sampler.RandomSampler(dataset, replacement=False)
elif sampler_option == 'weighted':
s = sampler.WeightedRandomSampler(weights, len(weights))
else:
raise NotImplementedError(
"The option %s for sampler is not implemented" % sampler_option)
return s
def get_dataloader(dataset,
balance_data,
batch_size,
num_workers,
shuffle=True):
if balance_data:
weights = dataset.get_data_weights(balance_data)
sampler_ = sampler.WeightedRandomSampler(weights, len(weights))
elif shuffle:
sampler_ = sampler.RandomSampler(dataset)
else:
sampler_ = None
dataloader = torch.utils.data.DataLoader(dataset,
batch_size=batch_size,
sampler=sampler_,
num_workers=num_workers)
return dataloader
def ClassificationDatasetTest():
root = '/media/shehabk/E_DRIVE/processed_db/expw/cropped_images/cropped_alligned_orig_256'
image_list = '/media/shehabk/E_DRIVE/processed_db/expw/partition/seven_neutral_alligned_orig/train.txt'
dataset = ClassificationDataset(
root,
image_list,
transform=transforms.Compose([
transforms.RandomRotation(3),
transforms.Resize((118, 100)),
transforms.RandomCrop((112, 96)),
# transforms.RandomResizedCrop(224, scale=(0.74, 0.78),
# ratio=(1.0, 1.0)),
transforms.RandomHorizontalFlip(),
transforms.ToTensor(),
transforms.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225])
]))
# Balancing the classes !!!!!!
prob = np.zeros(3)
for i in range(len(dataset)):
cur_class = dataset[i][1]
prob[cur_class] += 1
prob = 1.0 / prob
reciprocal_weights = np.zeros(len(dataset))
epoch_length = 2000
for i in range(len(dataset)):
_, label = dataset[i]
reciprocal_weights[i] = prob[label]
weights = torch.from_numpy(reciprocal_weights)
weighted_sampler = sampler.WeightedRandomSampler(weights, epoch_length)
loader = DataLoader(dataset, batch_size=10, sampler=weighted_sampler)
# loader = DataLoader(dataset, batch_size=5, shuffle=True)
for i_batch, data in enumerate(loader):
images, labels = data
print(labels)
out = utils.make_grid(images, nrow=1)
imshow(out)
# vs.imshow(out , mean = [0.524462] , std = [0.285962])
# vs.imshow(out, mean=[0.524462, 0.524462, 0.524462], std=[0.285962, 0.285962, 0.285962])
break
def train_dataloader(self):
if self.hparams.weight_sample:
spl = sampler.WeightedRandomSampler(
self.train_ds.target_weights, int(len(self.train_ds) / self.hparams.epoch_cut), replacement=True
)
return DataLoader(
self.train_ds,
batch_size=self.hparams.batch_size,
sampler=spl,
num_workers=self.hparams.num_workers,
pin_memory=True,
)
else:
return DataLoader(
self.train_ds,
batch_size=self.hparams.batch_size,
shuffle=true,
num_workers=self.hparams.num_workers,
pin_memory=True,
)
def load_RM_data(path,
batch_size,
length,
use_embedding,
balanced_sampler=False):
train = RMdata(path,
use_embedding=use_embedding,
length=length,
mode='train')
valid = RMdata(path,
use_embedding=use_embedding,
length=length,
mode='valid')
if not balanced_sampler:
train_loader = DataLoader(dataset=train,
batch_size=batch_size,
shuffle=True)
else:
weights_train = make_weights_for_balanced_classes(train)
# weights_valid = make_weights_for_balanced_classes(valid)
weights_train = torch.cuda.DoubleTensor(weights_train)
# weights_valid = torch.cuda.DoubleTensor(weights_valid)
sampler_train = sampler.WeightedRandomSampler(weights_train,
len(weights_train))
# sampler_valid = sampler.WeightedRandomSampler(weights_valid, len(weights_valid))
train_loader = DataLoader(dataset=train,
batch_size=batch_size,
sampler=sampler_train)
# valid_loader = DataLoader(dataset=valid,batch_size=batch_size,sampler=sampler_valid)
valid_loader = DataLoader(dataset=valid,
batch_size=batch_size,
shuffle=True)
return train_loader, valid_loader
def dataloader(x_mal, x_ben):
y_mal = np.ones(x_mal.shape[0])
y_ben = np.zeros(x_ben.shape[0])
x = np.concatenate([x_mal, x_ben])
y = np.concatenate([y_mal, y_ben])
class_sample_count = np.array(
[len(np.where(y == t)[0]) for t in np.unique(y)])
weight = 1. / class_sample_count
samples_weight = []
for t in range(len(y) - 1):
samples_weight.append(weight[int(y[t])])
Sampler = sampler.WeightedRandomSampler(samples_weight,
len(samples_weight))
data = TensorDataset(torch.from_numpy(x), torch.from_numpy(y))
data_loader = DataLoader(data,
batch_size=batch_size,
sampler=Sampler,
drop_last=True)
return data_loader
# if __name__ == "__main__":
def make_train_valid_loaders(self,
distributed=False
) -> Tuple[DataLoader, DataLoader]:
train_dataset, valid_dataset = self.make_train_valid_datasets()
train_weights = torch.DoubleTensor(
[1.0] * len(train_dataset)) # uniform sampling
train_sampler = sampler.WeightedRandomSampler(
weights=train_weights,
num_samples=self._data_params['batch_size'] *
self._data_params['steps_per_epoch'],
)
train_loader = self._make_loader(train_dataset,
train_sampler,
mode='train',
distributed=distributed)
valid_loader = self._make_loader(
valid_dataset,
sampler.SequentialSampler(valid_dataset),
mode='valid',
distributed=distributed,
)
return train_loader, valid_loader
def get_dataloader_obj(data_dir,
data_transforms,
weights,
num_samples,
is_slr=False,
data_types=['train', 'test', 'val'],
bs=4):
try:
slr = sampler.WeightedRandomSampler(weights, num_samples)
image_datasets = {
x: datasets.ImageFolder(os.path.join(data_dir, x),
data_transforms[x])
for x in data_types
}
dataloaders = {
x: DataLoader(image_datasets[x],
batch_size=bs,
shuffle=True,
num_workers=bs)
for x in data_types
}
if is_slr:
dataloaders = {
x: DataLoader(image_datasets[x],
batch_size=bs,
sampler=slr,
num_workers=bs)
for x in data_types
}
dsizes = {x: len(image_datasets[x]) for x in data_types}
class_names = image_datasets['train'].classes
dev = device("cuda:0" if cuda.is_available() else "cpu")
return dataloaders, dsizes, class_names, dev
except Exception as e:
print(traceback.format_exc())
raise e
def main(train_root, train_csv, train_split, val_root, val_csv, val_split,
epochs, aug, model_name, batch_size, num_workers, val_samples,
early_stopping_patience, n_classes, weighted_loss, balanced_loader,
_run):
assert (model_name
in ('inceptionv4', 'resnet152', 'densenet161', 'senet154'))
AUGMENTED_IMAGES_DIR = os.path.join(fs_observer.dir, 'images')
CHECKPOINTS_DIR = os.path.join(fs_observer.dir, 'checkpoints')
BEST_MODEL_PATH = os.path.join(CHECKPOINTS_DIR, 'model_best.pth')
LAST_MODEL_PATH = os.path.join(CHECKPOINTS_DIR, 'model_last.pth')
for directory in (AUGMENTED_IMAGES_DIR, CHECKPOINTS_DIR):
os.makedirs(directory)
device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
if model_name == 'inceptionv4':
model = ptm.inceptionv4(num_classes=1000, pretrained='imagenet')
model.last_linear = nn.Linear(model.last_linear.in_features, n_classes)
aug['size'] = 299
aug['mean'] = model.mean
aug['std'] = model.std
elif model_name == 'resnet152':
model = models.resnet152(pretrained=True)
model.fc = nn.Linear(model.fc.in_features, n_classes)
aug['size'] = 224
aug['mean'] = [0.485, 0.456, 0.406]
aug['std'] = [0.229, 0.224, 0.225]
elif model_name == 'densenet161':
model = models.densenet161(pretrained=True)
model.classifier = nn.Linear(model.classifier.in_features, n_classes)
aug['size'] = 224
aug['mean'] = [0.485, 0.456, 0.406]
aug['std'] = [0.229, 0.224, 0.225]
elif model_name == 'senet154':
model = ptm.senet154(num_classes=1000, pretrained='imagenet')
model.last_linear = nn.Linear(model.last_linear.in_features, n_classes)
aug['size'] = model.input_size[1]
aug['mean'] = model.mean
aug['std'] = model.std
model.to(device)
augs = Augmentations(**aug)
model.aug_params = aug
train_ds = CSVDatasetWithName(train_root,
train_csv,
'image',
'label',
transform=augs.tf_transform,
add_extension='.jpg',
split=train_split)
val_ds = CSVDatasetWithName(val_root,
val_csv,
'image',
'label',
transform=augs.tf_transform,
add_extension='.jpg',
split=val_split)
datasets = {'train': train_ds, 'val': val_ds}
if balanced_loader:
data_sampler = sampler.WeightedRandomSampler(train_ds.sampler_weights,
len(train_ds))
shuffle = False
else:
data_sampler = None
shuffle = True
dataloaders = {
'train':
DataLoader(datasets['train'],
batch_size=batch_size,
shuffle=shuffle,
num_workers=num_workers,
sampler=data_sampler,
worker_init_fn=set_seeds),
'val':
DataLoader(datasets['val'],
batch_size=batch_size,
shuffle=False,
num_workers=num_workers,
worker_init_fn=set_seeds),
}
if weighted_loss:
criterion = nn.CrossEntropyLoss(
weight=torch.Tensor(datasets['train'].class_weights_list).cuda())
else:
criterion = nn.CrossEntropyLoss()
optimizer = optim.SGD(model.parameters(),
lr=0.001,
momentum=0.9,
weight_decay=0.001)
scheduler = optim.lr_scheduler.ReduceLROnPlateau(optimizer,
factor=0.1,
min_lr=1e-5,
patience=10)
metrics = {
'train': pd.DataFrame(columns=['epoch', 'loss', 'acc']),
'val': pd.DataFrame(columns=['epoch', 'loss', 'acc'])
}
best_val_loss = 1000.0
epochs_without_improvement = 0
batches_per_epoch = None
for epoch in range(epochs):
print('train epoch {}/{}'.format(epoch + 1, epochs))
epoch_train_result = train_epoch(device, model, dataloaders, criterion,
optimizer, 'train', batches_per_epoch)
metrics['train'] = metrics['train'].append(
{
**epoch_train_result, 'epoch': epoch
}, ignore_index=True)
print('train', epoch_train_result)
epoch_val_result = train_epoch(device, model, dataloaders, criterion,
optimizer, 'val', batches_per_epoch)
metrics['val'] = metrics['val'].append(
{
**epoch_val_result, 'epoch': epoch
}, ignore_index=True)
print('val', epoch_val_result)
scheduler.step(epoch_val_result['loss'])
if epoch_val_result['loss'] < best_val_loss:
best_val_loss = epoch_val_result['loss']
epochs_without_improvement = 0
torch.save(model, BEST_MODEL_PATH)
print('Best loss at epoch {}'.format(epoch))
else:
epochs_without_improvement += 1
print('-' * 40)
if epochs_without_improvement > early_stopping_patience:
torch.save(model, LAST_MODEL_PATH)
break
if epoch == (epochs - 1):
torch.save(model, LAST_MODEL_PATH)
for phase in ['train', 'val']:
metrics[phase].epoch = metrics[phase].epoch.astype(int)
metrics[phase].to_csv(os.path.join(fs_observer.dir, phase + '.csv'),
index=False)
print('Best validation loss: {}'.format(best_val_loss))
# TODO: return more metrics
return {'max_val_acc': metrics['val']['acc'].max()}
def get_dataloader_train(args, root, image_list):
# kwargs = {'num_workers': 4, 'pin_memory': True} if args.cuda else {}
kwargs = {'num_workers': args.num_workers, 'pin_memory': args.pin_memory}
if (args.architecture in ['resnet_i48_18']):
dataset = ds.ClassificationDataset(
root,
image_list,
transform=transforms.Compose([
transforms.Resize(60),
transforms.RandomRotation(3),
transforms.RandomCrop(48),
# transforms.RandomResizedCrop(48, scale = (0.72,0.76) , ratio = (1.0,1.0)),
transforms.RandomHorizontalFlip(),
transforms.ToTensor(),
transforms.Normalize((0.5, ), (0.28, ))
]),
is_grey=False)
elif args.architecture in ['resnet_i24_34']:
dataset = ds.ClassificationDataset(
root,
image_list,
transform=transforms.Compose([
transforms.Resize(28),
transforms.RandomRotation(3),
transforms.RandomCrop(24),
# transforms.RandomResizedCrop(48, scale = (0.72,0.76) , ratio = (1.0,1.0)),
transforms.RandomHorizontalFlip(),
transforms.ToTensor(),
transforms.Normalize([0.485, 0.456, 0.406],
[0.229, 0.224, 0.225])
]),
is_grey=False)
else:
dataset = ds.ClassificationDataset(
root,
image_list,
transform=transforms.Compose([
transforms.Resize(256),
transforms.RandomRotation(3),
# transforms.RandomCrop(224),
transforms.RandomResizedCrop(224,
scale=(0.74, 0.85),
ratio=(1.0, 1.0)),
transforms.RandomHorizontalFlip(),
transforms.ToTensor(),
transforms.Normalize([0.485, 0.456, 0.406],
[0.229, 0.224, 0.225])
]),
)
# Balancing the classes !!!!!!
prob = np.zeros(args.num_classes)
for i in range(len(dataset)):
cur_class = dataset.labels[i]
prob[cur_class] += 1
prob = 1.0 / prob
reciprocal_weights = np.zeros(len(dataset))
epoch_length = args.epoch_length
for i in range(len(dataset)):
label = dataset.labels[i]
reciprocal_weights[i] = prob[label]
weights = torch.from_numpy(reciprocal_weights)
weighted_sampler = sampler.WeightedRandomSampler(weights, epoch_length)
loader = DataLoader(dataset,
batch_size=args.batch_size,
sampler=weighted_sampler,
**kwargs)
# loader = DataLoader(dataset, batch_size=args.batch_size, shuffle=True)
return loader
}
else:
dsets = {
x: MyImageFolder(root=args.data_root,
idx_file=idx_files[x],
transform=data_transforms[x])
for x in data_splits
}
shuffle_options = {'train': True, 'val': False, 'test': False}
if args.weighted_sample:
sample_weight = dsets['train'].get_sample_weights()
samplers = {
'train':
sampler.WeightedRandomSampler(weights=sample_weight,
num_samples=len(dsets['train'])),
'val':
None,
'test':
None
}
else: # RandomSampler in train phase, SequentialSampler in val and test phase.
samplers = {'train': None, 'val': None, 'test': None}
dset_loaders = {
x: torch.utils.data.DataLoader(
dsets[x],
batch_size=args.batch_size,
shuffle=shuffle_options[x],
sampler=samplers[
x], # If specified, the 'shuffle' argument is ignored
def train(arguments):
# Parse input arguments
json_filename = arguments.config
network_debug = arguments.debug
# Load options
json_opts = json_file_to_pyobj(json_filename)
train_opts = json_opts.training
# Architecture type
arch_type = train_opts.arch_type
# Setup Dataset and Augmentation
ds_class = get_dataset(arch_type)
ds_path = get_dataset_path(arch_type, json_opts.data_path)
ds_transform = get_dataset_transformation(arch_type,
opts=json_opts.augmentation)
# Setup the NN Model
model = get_model(json_opts.model)
if network_debug:
print('# of pars: ', model.get_number_parameters())
print('fp time: {0:.3f} sec\tbp time: {1:.3f} sec per sample'.format(
*model.get_fp_bp_time()))
exit()
# Setup Data Loader
num_workers = train_opts.num_workers if hasattr(train_opts,
'num_workers') else 16
train_dataset = ds_class(ds_path,
split='train',
transform=ds_transform['train'],
preload_data=train_opts.preloadData)
valid_dataset = ds_class(ds_path,
split='val',
transform=ds_transform['valid'],
preload_data=train_opts.preloadData)
test_dataset = ds_class(ds_path,
split='test',
transform=ds_transform['valid'],
preload_data=train_opts.preloadData)
# create sampler
if train_opts.sampler == 'stratified':
print('stratified sampler')
train_sampler = StratifiedSampler(train_dataset.labels,
train_opts.batchSize)
batch_size = 52
elif train_opts.sampler == 'weighted2':
print('weighted sampler with background weight={}x'.format(
train_opts.bgd_weight_multiplier))
# modify and increase background weight
weight = train_dataset.weight
bgd_weight = np.min(weight)
weight[abs(weight - bgd_weight) <
1e-8] = bgd_weight * train_opts.bgd_weight_multiplier
train_sampler = sampler.WeightedRandomSampler(
weight, len(train_dataset.weight))
batch_size = train_opts.batchSize
else:
print('weighted sampler')
train_sampler = sampler.WeightedRandomSampler(
train_dataset.weight, len(train_dataset.weight))
batch_size = train_opts.batchSize
# loader
train_loader = DataLoader(dataset=train_dataset,
num_workers=num_workers,
batch_size=batch_size,
sampler=train_sampler)
valid_loader = DataLoader(dataset=valid_dataset,
num_workers=num_workers,
batch_size=train_opts.batchSize,
shuffle=True)
test_loader = DataLoader(dataset=test_dataset,
num_workers=num_workers,
batch_size=train_opts.batchSize,
shuffle=True)
# Visualisation Parameters
visualizer = Visualiser(json_opts.visualisation, save_dir=model.save_dir)
error_logger = ErrorLogger()
# Training Function
track_labels = np.arange(len(train_dataset.label_names))
model.set_labels(track_labels)
model.set_scheduler(train_opts)
if hasattr(model, 'update_state'):
model.update_state(0)
for epoch in range(model.which_epoch, train_opts.n_epochs):
print('(epoch: %d, total # iters: %d)' % (epoch, len(train_loader)))
# # # --- Start ---
# import matplotlib.pyplot as plt
# plt.ion()
# plt.figure()
# target_arr = np.zeros(14)
# # # --- End ---
# Training Iterations
for epoch_iter, (images, labels) in tqdm(enumerate(train_loader, 1),
total=len(train_loader)):
# Make a training update
model.set_input(images, labels)
model.optimize_parameters()
if epoch == (train_opts.n_epochs - 1):
import time
time.sleep(36000)
if train_opts.max_it == epoch_iter:
break
# # # --- visualise distribution ---
# for lab in labels.numpy():
# target_arr[lab] += 1
# plt.clf(); plt.bar(train_dataset.label_names, target_arr); plt.pause(0.01)
# # # --- End ---
# Visualise predictions
if epoch_iter <= 100:
visuals = model.get_current_visuals()
visualizer.display_current_results(visuals,
epoch=epoch,
save_result=False)
# Error visualisation
errors = model.get_current_errors()
error_logger.update(errors, split='train')
# Validation and Testing Iterations
pr_lbls = []
gt_lbls = []
for loader, split in zip([valid_loader, test_loader],
['validation', 'test']):
model.reset_results()
for epoch_iter, (images, labels) in tqdm(enumerate(loader, 1),
total=len(loader)):
# Make a forward pass with the model
model.set_input(images, labels)
model.validate()
# Visualise predictions
visuals = model.get_current_visuals()
visualizer.display_current_results(visuals,
epoch=epoch,
save_result=False)
if train_opts.max_it == epoch_iter:
break
# Error visualisation
errors = model.get_accumulated_errors()
stats = model.get_classification_stats()
error_logger.update({**errors, **stats}, split=split)
# HACK save validation error
if split == 'validation':
valid_err = errors['CE']
# Update the plots
for split in ['train', 'validation', 'test']:
# exclude bckground
#track_labels = np.delete(track_labels, 3)
#show_labels = train_dataset.label_names[:3] + train_dataset.label_names[4:]
show_labels = train_dataset.label_names
visualizer.plot_current_errors(epoch,
error_logger.get_errors(split),
split_name=split,
labels=show_labels)
visualizer.print_current_errors(epoch,
error_logger.get_errors(split),
split_name=split)
error_logger.reset()
# Save the model parameters
if epoch % train_opts.save_epoch_freq == 0:
model.save(epoch)
if hasattr(model, 'update_state'):
model.update_state(epoch)
# Update the model learning rate
model.update_learning_rate(metric=valid_err, epoch=epoch)
print '#vehicles found: ', data_splitter.num_of_vehicles
# Setup training and validation data loaders.
flag_data_augmentation = False
flag_with_intensities = False
hdf5_dataset = HDF5Dataset(data_splitter,
'training',
flag_data_augmentation=flag_data_augmentation,
flag_with_intensities=flag_with_intensities)
hdf5_dataset_val = HDF5Dataset(data_splitter,
'validation',
flag_data_augmentation=False,
flag_with_intensities=flag_with_intensities)
# Weighted sampling: sample pedestrians more than vehicles.
sampler = sampler.WeightedRandomSampler(sample_weights, len(sample_weights))
train_loader = DataLoader(hdf5_dataset,
batch_size=opt.batchSize,
sampler=sampler,
shuffle=False) #, num_workers=2)
val_loader = DataLoader(hdf5_dataset_val,
batch_size=opt.batchSize,
shuffle=False)
# print(len(dataset), len(test_dataset))
num_classes = 2
# print('classes', num_classes)
try:
os.makedirs(opt.outf)
except OSError:
print("Training set distribution:")
print_distribution(ids_train)
print("Validation set distribution:")
print_distribution(ids_val)
classes_train = [get_class(idx.split('/')[-2]) for idx in ids_train]
class_weight = class_weight.compute_class_weight('balanced',
np.unique(classes_train),
classes_train)
classes_val = [get_class(idx.split('/')[-2]) for idx in ids_val]
weights = [class_weight[i_class] for i_class in classes_train]
weights = torch.DoubleTensor(weights)
train_sampler = sampler.WeightedRandomSampler(weights, len(weights))
weights = [class_weight[i_class] for i_class in classes_val]
weights = torch.DoubleTensor(weights)
val_sampler = sampler.WeightedRandomSampler(weights, len(weights))
train_dataset = IEEECameraDataset(ids_train,
crop_size=CROP_SIZE,
training=True,
model=m_names)
val_dataset = IEEECameraDataset(ids_val,
crop_size=CROP_SIZE,
training=False,
model=m_names)
train_loader = DataLoader(train_dataset,
def build(task, config, task_subset_name):
"""
Static method returning particular sampler, depending on the name \
provided in the list of parameters & the specified task class.
:param task: Instance of an object derived from the Task class.
:type task: ``tasks.Task``
:param config: Parameters used to instantiate the sampler.
:type config: :py:class:`ptp.configuration.ConfigInterface`
:param task_subset_name: Name of task subset (and associated TaskManager object)
..note::
``config`` should contains the exact (case-sensitive) class name of the sampler to instantiate.
.. warning::
``torch.utils.data.sampler.BatchSampler``, \
``torch.utils.data.sampler.DistributedSampler`` are not supported yet.
.. note::
``torch.utils.data.sampler.SubsetRandomSampler`` expects 'indices' to index a subset of the dataset. \
Currently, the user can specify these indices using one of the following options:
- Option 1: range.
>>> indices = range(20)
- Option 2: range as str.
>>> range_str = '0, 20'
- Option 3: list of indices.
>>> yaml_list = yaml.load('[0, 2, 5, 10]')
- Option 4: name of the file containing indices.
>>> filename = "~/data/mnist/training_indices.txt"
.. note::
``torch.utils.data.sampler.WeightedRandomSampler`` expercse additional parameter 'weights'.
:return: Instance of a given sampler or ``None`` if the section not present or couldn't build the sampler.
"""
# Initialize logger.
logger = logging.initialize_logger('SamplerFactory')
try:
# Check presence of the typename attribute.
if 'type' not in config:
raise ConfigurationError(
"The sampler configuration section does not contain the key 'type'"
)
# Get the class typename.
typename = config['type']
logger.info(
'Trying to instantiate the {} sampler object'.format(typename))
###########################################################################
# Handle first special case: SubsetRandomSampler.
if typename == 'SubsetRandomSampler':
# Check presence of the typename attribute.
if 'indices' not in config:
raise ConfigurationError(
"The sampler configuration section does not contain the key 'indices' "
"required by SubsetRandomSampler")
# Get and process the indices.
indices = config['indices']
# Analyze the type.
if type(indices) == str:
# Try to open the file.
try:
# from expanduser()'s doc: If the expansion fails or if the path does not begin
# with a tilde, the path is returned unchanged. -> So operation below should be safe.
file = open(os.path.expanduser(indices), "r")
# Read the file.
indices = file.readline()
file.close()
except Exception:
# Ok, this is not a file.
pass
finally:
# Try to process it as a string.
# Get the digits.
digits = indices.split(',')
indices = [int(x) for x in digits]
else:
# Assume that type(indices) is a list of ints.
digits = indices
# Finally, we got the list of digits.
if len(digits) == 2:
# Create a range.
indices = range(int(digits[0]), int(digits[1]))
# Else: use them as they are, including single index.
# Check if indices are within range.
if max(indices) >= len(task):
raise ConfigurationError(
"SubsetRandomSampler cannot work properly when indices are out of range ({}) "
"considering that there are {} samples in the task".
format(max(indices), len(task)))
# Create the sampler object.
sampler = pt_samplers.SubsetRandomSampler(indices)
###########################################################################
# Handle second special case: WeightedRandomSampler.
elif typename == 'WeightedRandomSampler':
# Check presence of the attribute.
if 'weights' not in config:
raise ConfigurationError(
"The sampler configuration section does not contain the key 'weights' "
"required by WeightedRandomSampler")
# Load weights from file.
weights = np.fromfile(os.path.expanduser(config['weights']),
dtype=float,
count=-1,
sep=',')
# Create sampler class.
sampler = pt_samplers.WeightedRandomSampler(weights,
len(task),
replacement=True)
###########################################################################
# Handle third special case: kFoldRandomSampler.
elif typename == 'kFoldRandomSampler':
# Check presence of the attribute.
if 'folds' not in config:
raise ConfigurationError(
"The sampler configuration section does not contain the key 'folds' "
"required by kFoldRandomSampler")
# Create indices, depending on the fold.
folds = config["folds"]
if folds < 2:
raise ConfigurationError(
"kFoldRandomSampler requires at least two 'folds'")
# Get epochs per fold (default: 1).
epochs_per_fold = config.get("epochs_per_fold", 1)
# Create the sampler object.
sampler = ptp_samplers.kFoldRandomSampler(
len(task), folds, epochs_per_fold,
task_subset_name == 'training')
###########################################################################
# Handle fourd special case: kFoldWeightedRandomSampler.
elif typename == 'kFoldWeightedRandomSampler':
# Check presence of the attribute.
if 'weights' not in config:
raise ConfigurationError(
"The sampler configuration section does not contain the key 'weights' "
"required by kFoldWeightedRandomSampler")
# Load weights from file.
weights = np.fromfile(os.path.expanduser(config['weights']),
dtype=float,
count=-1,
sep=',')
# Check presence of the attribute.
if 'folds' not in config:
raise ConfigurationError(
"The sampler configuration section does not contain the key 'folds' "
"required by kFoldWeightedRandomSampler")
# Create indices, depending on the fold.
folds = config["folds"]
if folds < 2:
raise ConfigurationError(
"kFoldRandomSampler requires at least two 'folds'")
# Get epochs per fold (default: 1).
epochs_per_fold = config.get("epochs_per_fold", 1)
# Create the sampler object.
sampler = ptp_samplers.kFoldWeightedRandomSampler(
weights, len(task), folds, epochs_per_fold,
task_subset_name == 'training')
elif typename in ['BatchSampler', 'DistributedSampler']:
# Sorry, don't support those. Yet;)
raise ConfigurationError(
"Sampler Factory currently does not support the '{}' sampler. Please pick one of the others "
"or use defaults random sampling".format(typename))
else:
# Verify that the specified class is in the samplers package.
if typename not in dir(pt_samplers):
raise ConfigurationError(
"Could not find the specified class '{}' in the samplers package"
.format(typename))
# Get the sampler class.
sampler_class = getattr(pt_samplers, typename)
# Create "regular" sampler.
sampler = sampler_class(task)
# Return sampler.
return sampler
except ConfigurationError as e:
logger.error(e)
# Do not continue with invalid sampler.
exit(-1)
