def main():
# Command line options
args = parser.parse_args()
print("Command line options:")
for arg in vars(args):
print(arg, getattr(args, arg))
if args.debug:
pdb.set_trace()
# Check whether GPU is available and can be used
# if CUDA is found then device is set accordingly
device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
# Launch a writer for the tensorboard summary writer instance
save_path = 'runs/' + strftime(
"%Y-%m-%d_%H-%M-%S",
gmtime()) + '_' + args.dataset + '_' + args.architecture
# if we are resuming a previous training, note it in the name
if args.resume:
save_path = save_path + '_resumed'
writer = SummaryWriter(save_path)
# saving the parsed args to file
log_file = os.path.join(save_path, "stdout")
log = open(log_file, "a")
for arg in vars(args):
log.write(arg + ':' + str(getattr(args, arg)) + '\n')
# Dataset loading
data_init_method = getattr(datasets, args.dataset)
dataset = data_init_method(torch.cuda.is_available(), args)
# get the number of classes from the class dictionary
num_classes = dataset.num_classes
# we set an epoch multiplier to 1 for isolated training and increase it proportional to amount of tasks in CL
epoch_multiplier = 1
# add command line options to TensorBoard
args_to_tensorboard(writer, args)
log.close()
# build the model
model = architectures.Inos_model(args.num_class, args)
# Parallel container for multi GPU use and cast to available device
model = torch.nn.DataParallel(model).to(device)
print(model)
if not args.pretrained:
# Initialize the weights of the model, by default according to He et al.
print("Initializing network with: " + args.weight_init)
WeightInitializer = WeightInit(args.weight_init)
WeightInitializer.init_model(model)
# Define optimizer and loss function (criterion)
optimizer = torch.optim.SGD(model.parameters(),
args.learning_rate,
momentum=0.9,
weight_decay=2e-4)
scheduler = torch.optim.lr_scheduler.MultiStepLR(
optimizer, milestones=[30, 60, 80, 100], gamma=0.5)
epoch = 0
best_prec = 0
best_loss = random.getrandbits(128)
# optionally resume from a checkpoint
if args.resume:
if os.path.isfile(args.resume):
print("=> loading checkpoint '{}'".format(args.resume))
checkpoint = torch.load(args.resume)
epoch = checkpoint['epoch']
best_prec = checkpoint['best_prec']
best_loss = checkpoint['best_loss']
model.load_state_dict(checkpoint['state_dict'])
# optimizer.load_state_dict(checkpoint['optimizer'])
print("=> loaded checkpoint '{}' (epoch {})".format(
args.resume, checkpoint['epoch']))
else:
print("=> no checkpoint found at '{}'".format(args.resume))
# optimize until final amount of epochs is reached. Final amount of epochs is determined through the
while epoch < (args.epochs * epoch_multiplier):
if epoch + 2 == epoch % args.epochs:
print("debug perpose")
# train
train(dataset, model, criterion, epoch, optimizer, writer, device,
args)
# evaluate on validation set
prec, loss = validate(dataset, model, criterion, epoch, writer, device,
save_path, args)
# evaluate on test set
prec_t, loss_t = test(dataset, model, criterion, epoch, writer, device,
save_path, args)
# remember best prec@1 and save checkpoint
is_best = loss < best_loss
best_loss = min(loss, best_loss)
best_prec = max(prec, best_prec)
save_checkpoint(
{
'epoch': epoch,
'arch': args.architecture,
'state_dict': model.state_dict(),
'best_prec': best_prec,
'best_loss': best_loss,
'optimizer': optimizer.state_dict()
}, is_best, save_path)
# increment epoch counters
epoch += 1
scheduler.step()
writer.close()
def main():
# Command line options
args = parser.parse_args()
print("Command line options:")
for arg in vars(args):
print(arg, getattr(args, arg))
if args.cross_dataset and not args.incremental_data:
raise ValueError(
'cross-dataset training possible only if incremental-data flag set'
)
# Check whether GPU is available and can be used
# if CUDA is found then device is set accordingly
device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
# Launch a writer for the tensorboard summary writer instance
save_path = 'runs/' + strftime("%Y-%m-%d_%H-%M-%S", gmtime()) + '_' + args.dataset + '_' + args.architecture +\
'_variational_samples_' + str(args.var_samples) + '_latent_dim_' + str(args.var_latent_dim)
# add option specific naming to separate tensorboard log files later
if args.autoregression:
save_path += '_pixelcnn'
if args.incremental_data:
save_path += '_incremental'
if args.train_incremental_upper_bound:
save_path += '_upper_bound'
if args.generative_replay:
save_path += '_genreplay'
if args.openset_generative_replay:
save_path += '_opensetreplay'
if args.cross_dataset:
save_path += '_cross_dataset_' + args.dataset_order
# if we are resuming a previous training, note it in the name
if args.resume:
save_path = save_path + '_resumed'
writer = SummaryWriter(save_path)
# saving the parsed args to file
log_file = os.path.join(save_path, "stdout")
log = open(log_file, "a")
for arg in vars(args):
log.write(arg + ':' + str(getattr(args, arg)) + '\n')
# Dataset loading
data_init_method = getattr(datasets, args.dataset)
dataset = data_init_method(torch.cuda.is_available(), args)
# get the number of classes from the class dictionary
num_classes = dataset.num_classes
# we set an epoch multiplier to 1 for isolated training and increase it proportional to amount of tasks in CL
epoch_multiplier = 1
if args.incremental_data:
from lib.Datasets.incremental_dataset import get_incremental_dataset
# get the method to create the incremental dataste (inherits from the chosen data loader)
inc_dataset_init_method = get_incremental_dataset(
data_init_method, args)
# different options for class incremental vs. cross-dataset experiments
if args.cross_dataset:
# if a task order file is specified, load the task order from it
if args.load_task_order:
# check if file exists and if file ends with extension '.txt'
if os.path.isfile(args.load_task_order) and len(args.load_task_order) >= 4\
and args.load_task_order[-4:] == '.txt':
print("=> loading task order from '{}'".format(
args.load_task_order))
with open(args.load_task_order, 'rb') as fp:
task_order = pickle.load(fp)
# if no file is found default to cmd line task order
else:
# parse and split string at commas
task_order = args.dataset_order.split(',')
for i in range(len(task_order)):
# remove blank spaces in dataset names
task_order[i] = task_order[i].replace(" ", "")
# use task order as specified in command line
else:
# parse and split string at commas
task_order = args.dataset_order.split(',')
for i in range(len(task_order)):
# remove blank spaces in dataset names
task_order[i] = task_order[i].replace(" ", "")
# just for getting the number of classes in the first dataset
num_classes = 0
for i in range(args.num_base_tasks):
temp_dataset_init_method = getattr(datasets, task_order[i])
temp_dataset = temp_dataset_init_method(
torch.cuda.is_available(), args)
num_classes += temp_dataset.num_classes
del temp_dataset
# multiply epochs by number of tasks
if args.num_increment_tasks:
epoch_multiplier = ((len(task_order) - args.num_base_tasks) /
args.num_increment_tasks) + 1
else:
# this branch will get active if num_increment_tasks is set to zero. This is useful when training
# any isolated upper bound with all datasets present from the start.
epoch_multiplier = 1.0
else:
# class incremental
# if specified load task order from file
if args.load_task_order:
if os.path.isfile(args.load_task_order):
print("=> loading task order from '{}'".format(
args.load_task_order))
task_order = np.load(args.load_task_order).tolist()
else:
# if no file is found a random task order is created
print(
"=> no task order found. Creating randomized task order"
)
task_order = np.random.permutation(num_classes).tolist()
else:
# if randomize task order is specified create a random task order, else task order is sequential
task_order = []
for i in range(dataset.num_classes):
task_order.append(i)
if args.randomize_task_order:
task_order = np.random.permutation(num_classes).tolist()
# save the task order
np.save(os.path.join(save_path, 'task_order.npy'), task_order)
# set the number of classes to base tasks + 1 because base tasks is always one less.
# E.g. if you have 2 classes it's one task. This is a little inconsistent from the naming point of view
# but we wanted a single variable to work for both class incremental as well as cross-dataset experiments
num_classes = args.num_base_tasks + 1
# multiply epochs by number of tasks
epoch_multiplier = (
(len(task_order) -
(args.num_base_tasks + 1)) / args.num_increment_tasks) + 1
print("Task order: ", task_order)
# log the task order into the text file
log.write('task_order:' + str(task_order) + '\n')
args.task_order = task_order
# this is a little weird, but it needs to be here because the below method pops items from task_order
args_to_tensorboard(writer, args)
assert epoch_multiplier.is_integer(), print(
"uneven task division, make sure number of tasks are integers.")
# Get the incremental dataset
dataset = inc_dataset_init_method(torch.cuda.is_available(), device,
task_order, args)
else:
# add command line options to TensorBoard
args_to_tensorboard(writer, args)
log.close()
# Get a sample input from the data loader to infer color channels/size
net_input, _ = next(iter(dataset.train_loader))
# get the amount of color channels in the input images
num_colors = net_input.size(1)
# import model from architectures class
net_init_method = getattr(architectures, args.architecture)
# if we are not building an autoregressive model the number of output channels of the model is equivalent to
# the amount of input channels. For an autoregressive models we set the number of output channels of the
# non-autoregressive decoder portion according to the command line option below
if not args.autoregression:
args.out_channels = num_colors
# build the model
model = net_init_method(device, num_classes, num_colors, args)
# optionally add the autoregressive decoder
if args.autoregression:
model.pixelcnn = PixelCNN(device,
num_colors,
args.out_channels,
args.pixel_cnn_channels,
num_layers=args.pixel_cnn_layers,
k=args.pixel_cnn_kernel_size,
padding=args.pixel_cnn_kernel_size // 2)
# Parallel container for multi GPU use and cast to available device
model = torch.nn.DataParallel(model).to(device)
print(model)
# Initialize the weights of the model, by default according to He et al.
print("Initializing network with: " + args.weight_init)
WeightInitializer = WeightInit(args.weight_init)
WeightInitializer.init_model(model)
# Define optimizer and loss function (criterion)
optimizer = torch.optim.Adam(model.parameters(), args.learning_rate)
epoch = 0
best_prec = 0
best_loss = random.getrandbits(128)
# optionally resume from a checkpoint
if args.resume:
if os.path.isfile(args.resume):
print("=> loading checkpoint '{}'".format(args.resume))
checkpoint = torch.load(args.resume)
epoch = checkpoint['epoch']
best_prec = checkpoint['best_prec']
best_loss = checkpoint['best_loss']
model.load_state_dict(checkpoint['state_dict'])
optimizer.load_state_dict(checkpoint['optimizer'])
print("=> loaded checkpoint '{}' (epoch {})".format(
args.resume, checkpoint['epoch']))
else:
print("=> no checkpoint found at '{}'".format(args.resume))
# optimize until final amount of epochs is reached. Final amount of epochs is determined through the
while epoch < (args.epochs * epoch_multiplier):
# visualize the latent space before each task increment and at the end of training if it is 2-D
if epoch % args.epochs == 0 and epoch > 0 or (epoch + 1) % (
args.epochs * epoch_multiplier) == 0:
if model.module.latent_dim == 2:
print("Calculating and visualizing dataset embedding")
# infer the number of current tasks to plot the different classes in the embedding
if args.incremental_data:
if args.cross_dataset:
num_tasks = sum(
dataset.num_classes_per_task[:len(dataset.
seen_tasks)])
else:
num_tasks = len(dataset.seen_tasks)
else:
num_tasks = num_classes
zs = get_latent_embedding(model, dataset.train_loader,
num_tasks, device)
visualize_dataset_in_2d_embedding(writer,
zs,
args.dataset,
save_path,
task=num_tasks)
# continual learning specific part
if args.incremental_data:
# at the end of each task increment
if epoch % args.epochs == 0 and epoch > 0:
print('Saving the last checkpoint from the previous task ...')
save_task_checkpoint(save_path, epoch // args.epochs)
print("Incrementing dataset ...")
dataset.increment_tasks(
model,
args.batch_size,
args.workers,
writer,
save_path,
is_gpu=torch.cuda.is_available(),
upper_bound_baseline=args.train_incremental_upper_bound,
generative_replay=args.generative_replay,
openset_generative_replay=args.openset_generative_replay,
openset_threshold=args.openset_generative_replay_threshold,
openset_tailsize=args.openset_weibull_tailsize,
autoregression=args.autoregression)
# grow the classifier and increment the variable for number of overall classes so we can use it later
if args.cross_dataset:
grow_classifier(
model.module.classifier,
sum(dataset.num_classes_per_task[:len(dataset.
seen_tasks)]) -
model.module.num_classes, WeightInitializer)
model.module.num_classes = sum(
dataset.num_classes_per_task[:len(dataset.seen_tasks)])
else:
model.module.num_classes += args.num_increment_tasks
grow_classifier(model.module.classifier,
args.num_increment_tasks,
WeightInitializer)
# reset moving averages etc. of the optimizer
optimizer = torch.optim.Adam(model.parameters(),
args.learning_rate)
# change the number of seen classes
if epoch % args.epochs == 0:
model.module.seen_tasks = dataset.seen_tasks
# train
train(dataset, model, criterion, epoch, optimizer, writer, device,
args)
# evaluate on validation set
prec, loss = validate(dataset, model, criterion, epoch, writer, device,
save_path, args)
# remember best prec@1 and save checkpoint
is_best = loss < best_loss
best_loss = min(loss, best_loss)
best_prec = max(prec, best_prec)
save_checkpoint(
{
'epoch': epoch,
'arch': args.architecture,
'state_dict': model.state_dict(),
'best_prec': best_prec,
'best_loss': best_loss,
'optimizer': optimizer.state_dict()
}, is_best, save_path)
# increment epoch counters
epoch += 1
# if a new task begins reset the best prec so that new best model can be stored.
if args.incremental_data and epoch % args.epochs == 0:
best_prec = 0
best_loss = random.getrandbits(128)
writer.close()
def __train_val_net(self, state_list, state_space_parameters, dataset):
# TODO: for average as reward
# reward = AverageMeter()
# TODO: for best reward
reward = 0.
net_input, _ = next(iter(dataset.val_loader))
gen_model = net(state_list, state_space_parameters, net_input,
self.args.batch_norm, self.args.drop_out_drop)
disc_model = discriminator(state_space_parameters, net_input,
self.args.discriminator_classes)
print(gen_model)
print('-' * 80)
print('Input size: {}'.format(gen_model.input_size))
print('-' * 80)
print('Estimated total gpu usage of model: {gpu_usage:.4f} GB'.format(
gpu_usage=gen_model.gpu_usage))
model_activations_gpu = gen_model.gpu_usage
cudnn.benchmark = True
self.WeightInitializer.init_model(gen_model)
self.WeightInitializer.init_model(disc_model)
gen_model = gen_model.to(self.device)
disc_model = disc_model.to(self.device)
print('available:{}'.format(
(self.gpu_mem_0.total_mem -
self.gpu_mem_0.total_mem * self.gpu_mem_0.get_mem_util()) /
1024.))
print('required per gpu with buffer: {}'.format(
(3. / float(self.args.no_gpus) * model_activations_gpu) + 1))
print('-' * 80)
if ((self.gpu_mem_0.total_mem - self.gpu_mem_0.total_mem *
self.gpu_mem_0.get_mem_util()) / 1024.) < (
(3. / float(self.args.no_gpus) * model_activations_gpu) + 1):
del gen_model, disc_model
return [None] * 2
elif not (gen_model.convT_no > 0 or gen_model.wrnT_bb_no > 0
or gen_model.fc_no > 0):
del gen_model, disc_model
return [None] * 2
if int(self.args.no_gpus) > 1:
gen_model = torch.nn.DataParallel(gen_model)
disc_model = torch.nn.DataParallel(disc_model)
criterion = nn.BCELoss(size_average=True).to(self.device)
gen_optimizer = optim.SGD(filter(lambda p: p.requires_grad,
gen_model.parameters()),
lr=self.args.learning_rate,
momentum=self.args.momentum,
weight_decay=self.args.weight_decay)
disc_optimizer = optim.SGD(filter(lambda p: p.requires_grad,
disc_model.parameters()),
lr=self.args.learning_rate,
momentum=self.args.momentum,
weight_decay=self.args.weight_decay)
lr_scheduler = LearningRateScheduler(self.args.lr_wr_epochs,
len(dataset.train_loader.dataset),
self.args.batch_size,
self.args.learning_rate,
self.args.lr_wr_mul,
self.args.lr_wr_min)
save_path_pictures = os.path.join(self.save_path, str(self.count + 1))
if not os.path.exists(save_path_pictures):
os.mkdir(save_path_pictures)
train_flag = True
epoch = 0
while epoch < self.args.epochs:
disc_losses_train, gen_losses_train = train(dataset, gen_model, disc_model, criterion,\
epoch, gen_optimizer, disc_optimizer,\
lr_scheduler, self.device, self.args)
disc_losses_valid, gen_losses_valid = validate(dataset, gen_model, disc_model, criterion, epoch,\
self.device, self.args, save_path_pictures)
reward = max(reward, 1. / (disc_losses_valid + gen_losses_valid))
# TODO: include early stopping criterion, plotting
epoch += 1
del gen_model, disc_model, criterion, disc_optimizer, gen_optimizer, lr_scheduler
return reward, train_flag
def main():
# Command line options
args = parser.parse_args()
print("Command line options:")
for arg in vars(args):
print(arg, getattr(args, arg))
# Check whether GPU is available and can be used
# if CUDA is found then device is set accordingly
device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
cudnn.benchmark = True
num_GPUs = torch.cuda.device_count()
# If save directory for runs doesn't exist then create it
if not os.path.exists('runs'):
os.mkdir('runs')
# Create a time-stamped save path for individual experiment
save_path = 'runs/' + strftime("%Y-%m-%d_%H-%M-%S", gmtime()) + \
';' + args.dataset + ';' + args.architecture
os.mkdir(save_path)
# List of values to log to csv
columns_list = [
'Filters', 'Parameters', 'Mean', 'Variance', 'Skew', 'BestVal',
'BestValsTrain', 'BestEpoch', 'LastValPrec', 'LastTrainPrec',
'AllTrain', 'AllVal'
]
df = pd.DataFrame(columns=columns_list)
# Dataset loading
data_init_method = getattr(datasets, args.dataset)
dataset = data_init_method(torch.cuda.is_available(), args)
# get the amount of color channels in the input images
net_input, _ = next(iter(dataset.train_loader))
num_colors = net_input.size(1)
# import model from architectures class
net_init_method = getattr(architectures, args.architecture)
# Get the parameters for all valid skewed models
SNModels = SkewNormalModels(depth=args.vgg_depth,
num_classes=dataset.num_classes,
patch_size=args.patch_size)
skew_model_params = SNModels.get_valid_models()
print("Total number of models: ", len(skew_model_params["filters"]))
# Weight-init method
WeightInitializer = WeightInit(args.weight_init)
# Optionally resume a previous experiment
current_id = args.resume_model_id
for i in range(len(skew_model_params["filters"]) - current_id):
print("Model filters: ", skew_model_params["filters"][i + current_id])
print("Model parameters: ",
skew_model_params["total_params"][i + current_id], " mean: ",
skew_model_params["means"][i + current_id], " var: ",
skew_model_params["vars"][i + current_id], " skew: ",
skew_model_params["skews"][i + current_id])
model = net_init_method(device,
dataset.num_classes,
num_colors,
args,
skew_model_params["filters"][i + current_id],
custom_filters=True)
# Parallel container for multi GPU use and cast to available device
model = torch.nn.DataParallel(model).to(device)
print(model)
# Initialize the weights of the model
print("Initializing networks with: " + args.weight_init)
WeightInitializer.init_model(model)
# Define criterion and optimizer
criterion = nn.CrossEntropyLoss()
optimizer = torch.optim.SGD(model.parameters(),
args.learning_rate,
momentum=args.momentum,
weight_decay=args.weight_decay,
nesterov=args.nesterov)
# Initialize SGDWR learning rate scheduler
lr_scheduler = LearningRateScheduler(args.lr_wr_epochs,
len(dataset.train_loader.dataset),
args.batch_size,
args.learning_rate,
args.lr_wr_mul, args.lr_wr_min)
# Get estimated GPU memory usage of the model and split batch if too little memory is available
if torch.cuda.is_available():
GPUMemory = GPUMem(torch.cuda.is_available())
print('available:{}'.format(
(GPUMemory.total_mem -
GPUMemory.total_mem * GPUMemory.get_mem_util()) / 1024.))
print('required per gpu with buffer: {}'.format(
(4. / float(num_GPUs) * model.module.gpu_usage) + 1.))
# calculate smaller chunk size to split batch into sequential computations
mem_scale_factor = 4.0 # TODO: WEIRD factor... why is this necessary and where does it come from?
# TODO: the + 1 Gb should be taken from the cache allocator
if ((GPUMemory.total_mem -
GPUMemory.total_mem * GPUMemory.get_mem_util()) / 1024.) < (
(mem_scale_factor / float(num_GPUs) *
model.module.gpu_usage) + 1.):
# code for variable batch size implementation as per gpu constraint; remove for old code
approx_small_batch_size = (((GPUMemory.total_mem - GPUMemory.total_mem * GPUMemory.get_mem_util()) / 1024.
- 1.) * float(num_GPUs) / mem_scale_factor) //\
(model.module.gpu_usage / float(args.batch_size))
diff = float('inf')
temp_small_batch_size = approx_small_batch_size
for j in range(1, (args.batch_size // 2) + 1):
if args.batch_size % j == 0 and abs(
j - approx_small_batch_size) < diff:
diff = abs(j - approx_small_batch_size)
temp_small_batch_size = j
batch_seq_split_size = temp_small_batch_size
else:
batch_seq_split_size = args.batch_size
else:
batch_seq_split_size = args.batch_size
# Get training and validation dataset loaders
dataset.train_loader, dataset.val_loader = dataset.get_dataset_loader(
batch_seq_split_size, args.workers, device)
print(
'sequential batch size split size:{}'.format(batch_seq_split_size))
epoch = 0
best_epoch = 0
best_prec = 0
best_val_train_prec = 0
all_train = []
all_val = []
while epoch < args.epochs:
# train for one epoch
train_prec = train(dataset.train_loader, model, criterion, epoch,
optimizer, lr_scheduler, device,
batch_seq_split_size, args)
# evaluate on validation set
prec = validate(dataset.val_loader, model, criterion, epoch,
device, args)
all_train.append(train_prec)
all_val.append(prec)
# remember best prec@1 and save checkpoint
is_best = prec > best_prec
if is_best:
best_epoch = epoch
best_val_train_prec = train_prec
best_prec = prec
# if architecture doesn't train at all skip it
if epoch == args.lr_wr_epochs - 1 and train_prec < (
2 * 100.0 / dataset.num_classes):
break
# increment epoch counters
epoch += 1
lr_scheduler.scheduler_epoch += 1
# append architecture results to csv
df = df.append(pd.DataFrame([[
skew_model_params["filters"][i + current_id],
skew_model_params["total_params"][i + current_id],
skew_model_params["means"][i + current_id],
skew_model_params["vars"][i + current_id],
skew_model_params["skews"][i + current_id], best_prec,
best_val_train_prec, best_epoch, prec, train_prec, all_train,
all_val
]],
columns=columns_list),
ignore_index=True)
df.to_csv(save_path + '/model_%03d' % (i + 1 + current_id) + '.csv')
del model
del optimizer
def __train_val_net(self, state_list, state_space_parameters, dataset):
best_prec = 0.
num_classes = len(dataset.val_loader.dataset.class_to_idx)
net_input, _ = next(iter(dataset.val_loader))
model = net(state_list, state_space_parameters, num_classes, net_input,
self.args.batch_norm, self.args.drop_out_drop)
print(model)
print('-' * 80)
print('SPP levels: {}'.format(model.spp_filter_size))
print('-' * 80)
print('Estimated total gpu usage of model: {gpu_usage:.4f} GB'.format(
gpu_usage=model.gpu_usage))
model_activations_gpu = model.gpu_usage
cudnn.benchmark = True
self.WeightInitializer.init_model(model)
model = model.to(self.device)
print('available:{}'.format(
(self.gpu_mem_0.total_mem -
self.gpu_mem_0.total_mem * self.gpu_mem_0.get_mem_util()) /
1024.))
print('required per gpu with buffer: {}'.format(
(3. / float(self.args.no_gpus) * model_activations_gpu) + 1))
print('-' * 80)
if ((self.gpu_mem_0.total_mem - self.gpu_mem_0.total_mem *
self.gpu_mem_0.get_mem_util()) / 1024.) < (
(3. / float(self.args.no_gpus) * model_activations_gpu) + 1):
del model
return [None] * 12
if int(self.args.no_gpus) > 1:
model = torch.nn.DataParallel(model)
criterion = nn.BCELoss(size_average=True).to(self.device)
optimizer = optim.SGD(filter(lambda p: p.requires_grad,
model.parameters()),
lr=self.args.learning_rate,
momentum=self.args.momentum,
weight_decay=self.args.weight_decay)
lr_scheduler = LearningRateScheduler(self.args.lr_wr_epochs,
len(dataset.train_loader.dataset),
self.args.batch_size,
self.args.learning_rate,
self.args.lr_wr_mul,
self.args.lr_wr_min)
train_flag = True
epoch = 0
while epoch < self.args.epochs:
train(dataset, model, criterion, epoch, optimizer, lr_scheduler,
self.device, self.args)
prec = validate(dataset, model, criterion, epoch, self.device,
self.args)
best_prec = max(prec, best_prec)
# TODO: hard-coded early stopping criterion of last prec < 15%
if epoch == (self.args.lr_wr_epochs -
1) and float(prec) < (1.5 * 100. / 10):
train_flag = False
break
epoch += 1
if self.args.no_gpus > 1:
spp_filter_size = model.module.spp_filter_size
else:
spp_filter_size = model.spp_filter_size
del model, criterion, optimizer, lr_scheduler
return spp_filter_size, best_prec, train_flag
def main():
# Command line options
args = parser.parse_args()
print("Command line options:")
for arg in vars(args):
print(arg, getattr(args, arg))
# import the correct loss and training functions depending which model to optimize
# TODO: these could easily be refactored into one function, but we kept it this way for modularity
if args.train_var:
if args.joint:
from lib.Training.train import train_var_joint as train
from lib.Training.validate import validate_var_joint as validate
from lib.Training.loss_functions import var_loss_function_joint as criterion
else:
from lib.Training.train import train_var as train
from lib.Training.validate import validate_var as validate
from lib.Training.loss_functions import var_loss_function as criterion
else:
if args.joint:
from lib.Training.train import train_joint as train
from lib.Training.validate import validate_joint as validate
from lib.Training.loss_functions import loss_function_joint as criterion
else:
from lib.Training.train import train as train
from lib.Training.validate import validate as validate
from lib.Training.loss_functions import loss_function as criterion
# Check whether GPU is available and can be used
# if CUDA is found then device is set accordingly
device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
# Launch a writer for the tensorboard summary writer instance
save_path = 'runs/' + strftime("%Y-%m-%d_%H-%M-%S", gmtime()) + '_' + args.dataset + '_' + args.architecture +\
'_dropout_' + str(args.dropout)
if args.train_var:
save_path += '_variational_samples_' + str(
args.var_samples) + '_latent_dim_' + str(args.var_latent_dim)
if args.joint:
save_path += '_joint'
# if we are resuming a previous training, note it in the name
if args.resume:
save_path = save_path + '_resumed'
writer = SummaryWriter(save_path)
# saving the parsed args to file
log_file = os.path.join(save_path, "stdout")
log = open(log_file, "a")
for arg in vars(args):
log.write(arg + ':' + str(getattr(args, arg)) + '\n')
# Dataset loading
data_init_method = getattr(datasets, args.dataset)
dataset = data_init_method(torch.cuda.is_available(), args)
# get the number of classes from the class dictionary
num_classes = dataset.num_classes
# add command line options to TensorBoard
args_to_tensorboard(writer, args)
log.close()
# Get a sample input from the data loader to infer color channels/size
net_input, _ = next(iter(dataset.train_loader))
# get the amount of color channels in the input images
num_colors = net_input.size(1)
# import model from architectures class
net_init_method = getattr(architectures, args.architecture)
# build the model
model = net_init_method(device, num_classes, num_colors, args)
# Parallel container for multi GPU use and cast to available device
model = torch.nn.DataParallel(model).to(device)
print(model)
# Initialize the weights of the model, by default according to He et al.
print("Initializing network with: " + args.weight_init)
WeightInitializer = WeightInit(args.weight_init)
WeightInitializer.init_model(model)
# Define optimizer and loss function (criterion)
optimizer = torch.optim.Adam(model.parameters(),
lr=args.learning_rate,
weight_decay=args.weight_decay)
epoch = 0
best_prec = 0
best_loss = random.getrandbits(128)
# optionally resume from a checkpoint
if args.resume:
if os.path.isfile(args.resume):
print("=> loading checkpoint '{}'".format(args.resume))
checkpoint = torch.load(args.resume)
epoch = checkpoint['epoch']
best_prec = checkpoint['best_prec']
best_loss = checkpoint['best_loss']
model.load_state_dict(checkpoint['state_dict'])
optimizer.load_state_dict(checkpoint['optimizer'])
print("=> loaded checkpoint '{}' (epoch {})".format(
args.resume, checkpoint['epoch']))
else:
print("=> no checkpoint found at '{}'".format(args.resume))
# optimize until final amount of epochs is reached.
while epoch < args.epochs:
# train
train(dataset, model, criterion, epoch, optimizer, writer, device,
args)
# evaluate on validation set
prec, loss = validate(dataset, model, criterion, epoch, writer, device,
args)
# remember best prec@1 and save checkpoint
is_best = loss < best_loss
best_loss = min(loss, best_loss)
best_prec = max(prec, best_prec)
save_checkpoint(
{
'epoch': epoch,
'arch': args.architecture,
'state_dict': model.state_dict(),
'best_prec': best_prec,
'best_loss': best_loss,
'optimizer': optimizer.state_dict()
}, is_best, save_path)
# increment epoch counters
epoch += 1
writer.close()
def train_val_net(state_list, dataset, weight_initializer, device, args,
save_path):
"""
builds a net given a state list, and trains and validates it
Parameters:
state_list (list): list of states to build the net
dataset (lib.Datasets.datasets.CODEBRIM): dataset to train and validate the net on
weight_initializer (lib.Models.initialization.WeightInit): weight initializer for initializing the weights of
the network
device (torch.device): type of computational device available (cpu / gpu)
args (argparse.ArgumentParser): parsed command line arguments
save_path (string): path for saving results to
Returns:
memfit (bool): True if the network fits the memory after batch splitting, False otherwise
val_acc_all_epochs (list): list of validation accuracies in all epochs
train_flag (bool): False if net's been early-stopped, False otherwise
"""
# reset the data loaders
dataset.train_loader, dataset.val_loader, dataset.test_loader = dataset.get_dataset_loader(
args.batch_size, args.workers, torch.cuda.is_available())
net_input, _ = next(iter(dataset.train_loader))
num_classes = dataset.num_classes
batch_size = net_input.size(0)
# gets number of available gpus and total gpu memory
num_gpu = float(torch.cuda.device_count())
gpu_mem = GPUMem(torch.device('cuda') == device)
# builds the net from the state list
model = Net(state_list, num_classes, net_input, args.batch_norm,
args.drop_out_drop)
print(model)
print('*' * 80)
print('no. of spp scales: {}'.format(model.spp_size))
print('*' * 80)
# sets cudnn benchmark flag
cudnn.benchmark = True
# initializes weights
weight_initializer.init_model(model)
# puts model on gpu/cpu
model = model.to(device)
# gets available gpu memory
gpu_avail = (gpu_mem.total_mem -
gpu_mem.total_mem * gpu_mem.get_mem_util()) / 1024.
print('gpu memory available:{gpu_avail:.4f}'.format(gpu_avail=gpu_avail))
# prints estimated gpu requirement of model but actual memory requirement is higher than what's estimated (from
# experiments)
print("model's estimated gpu memory requirement: {gpu_mem_req:.4f} GB".
format(gpu_mem_req=model.gpu_mem_req))
# scaling factor and buffer for matching expected memory requirement with empirically observed memory requirement
scale_factor = 4.0
scale_buffer = 1.0
scaled_gpu_mem_req = (scale_factor /
num_gpu) * model.gpu_mem_req + scale_buffer
print(
"model's empirically scaled gpu memory requirement: {scaled_gpu_mem_req:.4f}"
.format(scaled_gpu_mem_req=scaled_gpu_mem_req))
split_batch_size = batch_size
# splits batch into smaller batches
if gpu_avail < scaled_gpu_mem_req:
# estimates split batch size as per available gpu mem. (may not be a factor of original batch size)
approx_split_batch_size = int(
((gpu_avail - scale_buffer) * num_gpu / scale_factor) //
(model.gpu_mem_req / float(batch_size)))
diff = float('inf')
temp_split_batch_size = 1
# sets split batch size such that it's close to the estimated split batch size, is also a factor of original
# batch size & should give a terminal batch size of more than 1
for j in range(2, approx_split_batch_size + 1):
if batch_size % j == 0 and abs(
j - approx_split_batch_size) < diff and (
len(dataset.train_set) % j > 1):
diff = abs(j - approx_split_batch_size)
temp_split_batch_size = j
split_batch_size = temp_split_batch_size
print('split batch size:{}'.format(split_batch_size))
print('*' * 80)
# returns memfit = False if model doesn't fit in memory even after splitting the batch size to as small as 1
if split_batch_size < 2:
return False, None, None, None, None, None, False, None, None, None, None, None, None
# set the data loaders using the split batch size
dataset.train_loader, dataset.val_loader, dataset.test_loader = dataset.get_dataset_loader(
split_batch_size, args.workers, torch.cuda.is_available())
# use data parallelism for multi-gpu machine
model = torch.nn.DataParallel(model)
# cross entropy loss criterion (LogSoftmax and NLLoss together)
criterion = nn.BCELoss(reduction='mean').to(device)
# SGD optimizer with warm restarts
optimizer = optim.SGD(filter(lambda p: p.requires_grad,
model.parameters()),
lr=args.learning_rate,
momentum=args.momentum,
weight_decay=args.weight_decay)
# quarter cosine learning rate schedule for SGD with warm restarts
lr_scheduler = LearningRateScheduler(args.lr_wr_epochs,
len(dataset.train_loader.dataset),
args.batch_size, args.learning_rate,
args.lr_wr_mul, args.lr_wr_min)
train_flag = True
epoch = 0
loss_val_all_epochs = []
hard_val_all_epochs = []
soft_val_all_epochs = []
hard_best_background = 0.0
hard_best_crack = 0.0
hard_best_spallation = 0.0
hard_best_exposed_bars = 0.0
hard_best_efflorescence = 0.0
hard_best_corrosion_stain = 0.0
while epoch < args.epochs:
# train and validate the model
train(dataset.train_loader, model, criterion, epoch, optimizer,
lr_scheduler, device, args, split_batch_size)
loss_val, hard_val, soft_val, hard_background, hard_crack, hard_spallation, hard_exposed_bars,\
hard_efflorescence, hard_corrosion_stain = val(dataset.val_loader, model, criterion, device)
if int(args.task) == 2:
_ = val(dataset.test_loader,
model,
criterion,
device,
is_val=False)
if len(hard_val_all_epochs) == 0 or hard_val == max(
hard_val_all_epochs):
hard_best_background = hard_background
hard_best_crack = hard_crack
hard_best_spallation = hard_spallation
hard_best_exposed_bars = hard_exposed_bars
hard_best_efflorescence = hard_efflorescence
hard_best_corrosion_stain = hard_corrosion_stain
loss_val_all_epochs.append(loss_val)
hard_val_all_epochs.append(hard_val)
soft_val_all_epochs.append(soft_val)
if int(args.task) == 2:
# saves model dict while training fixed net
state = {
'epoch':
epoch,
'arch':
'Fixed net: replay buffer - {}, index no - {}'.format(
args.replay_buffer_csv_path, args.fixed_net_index_no),
'state_dict':
model.state_dict(),
'hard_val':
hard_val,
'optimizer':
optimizer.state_dict()
}
save_checkpoint(state,
max(hard_val_all_epochs) == hard_val, save_path)
# checks for early stopping; early-stops if the mean of the validation accuracy from the last 3 epochs before
# the early stopping epoch isn't at least as high as the early stopping threshold
if epoch == (args.early_stopping_epoch - 1) and float(np.mean(hard_val_all_epochs[-5:])) <\
(args.early_stopping_thresh * 100.):
train_flag = False
break
epoch += 1
hard_best_val = max(hard_val_all_epochs)
soft_best_val = max(soft_val_all_epochs)
# free up memory by deleting objects
spp_size = model.module.spp_size
del model, criterion, optimizer, lr_scheduler
return True, spp_size, hard_best_val, hard_val_all_epochs, soft_best_val, soft_val_all_epochs, train_flag,\
hard_best_background, hard_best_crack, hard_best_spallation, hard_best_exposed_bars,\
hard_best_efflorescence, hard_best_corrosion_stain
