def train_boots(dataset_name: str, network_architecture: str,
learning_rate: float, epochs: int, batch_size: int,
horizontal_flip: float, vertical_flip: float,
unet_filters: int, convolutions: int, plot: bool):
"""Train chosen model on selected dataset."""
# use GPU if avilable
device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
print(device)
dataset = {} # training and validation HDF5-based datasets
dataloader = {} # training and validation dataloaders
# only UCSD dataset provides greyscale images instead of RGB
input_channels = 1 if dataset_name == 'ucsd' else 3
# prob
epochs__ = 'epochs=' + str(epochs)
batch_size__ = 'batch=' + str(batch_size)
horizontal_flip__ = 'hf=' + str(horizontal_flip)
vertical_flip__ = 'vf=' + str(vertical_flip)
unet_filters__ = 'uf=' + str(unet_filters)
convolutions__ = "conv" + str(convolutions)
dirr = 'boots_results_' + dataset_name
Path(dirr).mkdir(parents=True, exist_ok=True)
# if plot flag is on, create a live plot (to be updated by Looper)
if plot:
pyplot.ion()
fig, plots = pyplot.subplots(nrows=2, ncols=2)
else:
plots = [None] * 2
for mode in ['train', 'valid']:
# expected HDF5 files in dataset_name/(train | valid).h5
data_path = os.path.join(dataset_name, f"{mode}.h5")
# turn on flips only for training dataset
dataset[mode] = H5Dataset(data_path,
horizontal_flip if mode == 'train' else 0,
vertical_flip if mode == 'train' else 0)
#train_indices = torch.zeros_like(dataset[mode].shape[0])
n_samples = len(dataset['train'])
#print("******", n_samples)
sampling_ratio = int(0.63 * n_samples)
results_train = []
results_test = []
for i in range(20):
# initialize a model based on chosen network_architecture
network = {
'UNet': UNet,
'UNet2': UNet2,
'FCRN_A': FCRN_A,
}[network_architecture](input_filters=input_channels,
filters=unet_filters,
N=convolutions,
p=0).to(device)
network = torch.nn.DataParallel(network)
# initialize loss, optimized and learning rate scheduler
loss = torch.nn.MSELoss()
optimizer = torch.optim.SGD(network.parameters(),
lr=learning_rate,
momentum=0.9,
weight_decay=1e-5)
lr_scheduler = torch.optim.lr_scheduler.StepLR(optimizer,
step_size=20,
gamma=0.1)
ntrain = torch.randperm(n_samples)[:sampling_ratio]
sampler = torch.utils.data.SubsetRandomSampler(ntrain)
dataloader['train'] = torch.utils.data.DataLoader(
dataset['train'], batch_size=batch_size, sampler=sampler)
dataloadertrain2 = torch.utils.data.DataLoader(dataset['train'],
batch_size=batch_size)
dataloader['valid'] = torch.utils.data.DataLoader(dataset['valid'],
batch_size=1)
# create training and validation Loopers to handle a single epoch
train_looper = Looper(network, device, loss,
optimizer, dataloader['train'],
len(dataset['train']), plots[0], False)
train_looper.LOG = True
# current best results (lowest mean absolute error on validation set)
current_best = np.infty
for epoch in range(epochs):
print(f"Epoch {epoch + 1}\n")
# run training epoch and update learning rate
result = train_looper.run()
lr_scheduler.step()
# update checkpoint if new best is reached
if result < current_best:
current_best = result
torch.save(
network.state_dict(),
os.path.join(
dirr,
f'{dataset_name}_boot_i={i}_{network_architecture}_{epochs__}_{batch_size__}_{horizontal_flip__}_{vertical_flip__}_{unet_filters__}_{convolutions__}.pth'
))
hist = []
#hist.append(valid_looper.history[-1])
hist.append(train_looper.history[-1])
#hist = np.array(hist)
#print(hist)
np.savetxt(os.path.join(
dirr,
f'hist_best_boot_{dataset_name}_{network_architecture}_i={i}_{epochs__}_{batch_size__}_{horizontal_flip__}_{vertical_flip__}_{unet_filters__}_{convolutions__}.csv'
),
hist,
delimiter=',')
print(f"\nNew best result: {result}")
print("\n", "-" * 80, "\n", sep='')
if plot:
fig.savefig(
os.path.join(
dirr,
f'status_boot_i={i}_{dataset_name}_{network_architecture}_{epochs__}_{batch_size__}_{horizontal_flip__}_{vertical_flip__}_{unet_filters__}_{convolutions__}.png'
))
network.load_state_dict(
torch.load(
os.path.join(
dirr,
f'{dataset_name}_boot_i={i}_{network_architecture}_{epochs__}_{batch_size__}_{horizontal_flip__}_{vertical_flip__}_{unet_filters__}_{convolutions__}.pth'
)))
valid_looper = Looper(network,
device,
loss,
optimizer,
dataloader['valid'],
len(dataset['valid']),
None,
False,
validation=True)
train_looper2 = Looper(network,
device,
loss,
optimizer,
dataloadertrain2,
len(dataloadertrain2),
None,
False,
validation=True)
valid_looper.LOG = False
train_looper2.LOG = False
valid_looper.MC = False
with torch.no_grad():
valid_looper.run()
train_looper2.run()
if i == 0:
results_train.append(train_looper2.true_values)
results_test.append(valid_looper.true_values)
results_train.append(train_looper2.predicted_values)
results_test.append(valid_looper.predicted_values)
print(f"[Training done] Best result: {current_best}")
hist = np.array(train_looper.history)
np.savetxt(os.path.join(
dirr,
f'hist_train_boot_i={i}_{dataset_name}_{network_architecture}_{epochs__}_{batch_size__}_{horizontal_flip__}_{vertical_flip__}_{unet_filters__}_{convolutions__}.csv'
),
hist,
delimiter=',')
hist = np.array(valid_looper.history)
np.savetxt(os.path.join(
dirr,
f'hist_test_boot_i={i}_{dataset_name}_{network_architecture}_{epochs__}_{batch_size__}_{horizontal_flip__}_{vertical_flip__}_{unet_filters__}_{convolutions__}.csv'
),
hist,
delimiter=',')
results_train = np.array(results_train)
results_train = results_train.transpose()
np.savetxt(os.path.join(
dirr,
f'predicted_train_best_boot_{dataset_name}_{network_architecture}_{epochs__}_{batch_size__}_{horizontal_flip__}_{vertical_flip__}_{unet_filters__}_{convolutions__}.csv'
),
results_train,
delimiter=',')
results_test = np.array(results_test)
results_test = results_test.transpose()
np.savetxt(os.path.join(
dirr,
f'predicted_test_best_boot_{dataset_name}_{network_architecture}_{epochs__}_{batch_size__}_{horizontal_flip__}_{vertical_flip__}_{unet_filters__}_{convolutions__}.csv'
),
results_test,
delimiter=',')
def train(dataset_name: str, network_architecture: str, learning_rate: float,
weight_decay: float, epochs: int, batch_size: int,
horizontal_flip: float, vertical_flip: float, unet_filters: int,
convolutions: int, dropout_prob: float, plot: bool):
"""Train chosen model on selected dataset."""
# use GPU if avilable
device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
print(device)
dataset = {} # training and validation HDF5-based datasets
dataloader = {} # training and validation dataloaders
for mode in ['train', 'valid']:
# expected HDF5 files in dataset_name/(train | valid).h5
data_path = os.path.join(dataset_name, f"{mode}.h5")
# turn on flips only for training dataset
dataset[mode] = H5Dataset(data_path,
horizontal_flip if mode == 'train' else 0,
vertical_flip if mode == 'train' else 0)
dataloader[mode] = torch.utils.data.DataLoader(dataset[mode],
batch_size=batch_size)
# only UCSD dataset provides greyscale images instead of RGB
input_channels = 1 if dataset_name == 'ucsd' else 3
# initialize a model based on chosen network_architecture
network = {
'UNet': UNet,
'UNet2': UNet2,
'UNet2_MC': UNet2_MC,
'UNet_MC': UNet_MC,
'FCRN_A': FCRN_A,
'FCRN_A_MC': FCRN_A_MC
}[network_architecture](input_filters=input_channels,
filters=unet_filters,
N=convolutions,
p=dropout_prob).to(device)
network = torch.nn.DataParallel(network)
# initialize loss, optimized and learning rate scheduler
loss = torch.nn.MSELoss()
#loss = torch.nn.L1Loss()
optimizer = torch.optim.SGD(network.parameters(),
lr=learning_rate,
momentum=0.9,
weight_decay=weight_decay) #1e-5
lr_scheduler = torch.optim.lr_scheduler.StepLR(optimizer,
step_size=20,
gamma=0.1)
# prob
epochs__ = 'epochs=' + str(epochs)
batch_size__ = 'batch=' + str(batch_size)
horizontal_flip__ = 'hf=' + str(horizontal_flip)
vertical_flip__ = 'vf=' + str(vertical_flip)
unet_filters__ = 'uf=' + str(unet_filters)
convolutions__ = "conv" + str(convolutions)
prob_label = 'p=' + str(dropout_prob)
weightdecay__ = "wd=" + str(weight_decay)
# if plot flag is on, create a live plot (to be updated by Looper)
if plot:
pyplot.ion()
fig, plots = pyplot.subplots(nrows=2, ncols=2)
else:
plots = [None] * 2
# create training and validation Loopers to handle a single epoch
train_looper = Looper(network, device,
loss, optimizer, dataloader['train'],
len(dataset['train']), plots[0], False)
valid_looper = Looper(network,
device,
loss,
optimizer,
dataloader['valid'],
len(dataset['valid']),
plots[1],
False,
validation=True)
train_looper.LOG = True
valid_looper.LOG = False
# current best results (lowest mean absolute error on validation set)
current_best = np.infty
for epoch in range(epochs):
print(f"Epoch {epoch + 1}\n")
# run training epoch and update learning rate
train_looper.run()
lr_scheduler.step()
# run validation epoch
with torch.no_grad():
result = valid_looper.run()
# update checkpoint if new best is reached
if result < current_best:
current_best = result
torch.save(
network.state_dict(),
f'{dataset_name}_{network_architecture}_{epochs__}_{batch_size__}_{horizontal_flip__}_{vertical_flip__}_{unet_filters__}_{convolutions__}_{prob_label}_{weightdecay__}.pth'
)
hist = []
hist.append(valid_looper.history[-1])
hist.append(train_looper.history[-1])
#hist = np.array(hist)
#print(hist)
np.savetxt(
f'hist_best_{dataset_name}_{network_architecture}_{epochs__}_{batch_size__}_{horizontal_flip__}_{vertical_flip__}_{unet_filters__}_{convolutions__}_{prob_label}_{weightdecay__}.csv',
hist,
delimiter=',')
print(f"\nNew best result: {result}")
print("\n", "-" * 80, "\n", sep='')
if plot:
fig.savefig(
f'status_{dataset_name}_{network_architecture}_{epochs__}_{batch_size__}_{horizontal_flip__}_{vertical_flip__}_{unet_filters__}_{convolutions__}_{prob_label}_{weightdecay__}.png'
)
print(f"[Training done] Best result: {current_best}")
hist = np.array(train_looper.history)
np.savetxt(
f'hist_train_{dataset_name}_{network_architecture}_{epochs__}_{batch_size__}_{horizontal_flip__}_{vertical_flip__}_{unet_filters__}_{convolutions__}_{prob_label}_{weightdecay__}.csv',
hist,
delimiter=',')
hist = np.array(valid_looper.history)
np.savetxt(
f'hist_test_{dataset_name}_{network_architecture}_{epochs__}_{batch_size__}_{horizontal_flip__}_{vertical_flip__}_{unet_filters__}_{convolutions__}_{prob_label}_{weightdecay__}.csv',
hist,
delimiter=',')
train_looper.plots = None
train_looper.validation = True
train_looper.LOG = False
train_looper.MC = True
valid_looper.plots = None
valid_looper.validation = True
valid_looper.LOG = False
valid_looper.MC = True
NETname = network_architecture + '_' + prob_label + '_' + weightdecay__
DATAname = dataset_name + '_train_'
train_looper.MCdropOut(100, NETname, DATAname)
DATAname = dataset_name + '_test_'
valid_looper.MCdropOut(100, NETname, DATAname)