def train(load_model: str, save_model: str, train_dataset: str,
test_dataset: str, no_train: bool, no_test: bool, epochs: int,
batch_size: int, learning_rate: float):
device = torch.device('cuda:0' if cuda.is_available() else 'cpu')
click.secho('Using device={}'.format(device), fg='blue')
net = Net()
net.to(device)
if load_model is not None:
click.secho('Loading model from \'{}\''.format(load_model),
fg='yellow')
net.load_state_dict(torch.load(load_model, map_location=device))
if not no_train:
click.echo('Training model using {}'.format(train_dataset))
net.train()
train_net(net,
data_path=train_dataset,
batch_size=batch_size,
num_epochs=epochs,
learning_rate=learning_rate)
if not no_train and save_model is not None:
click.secho('Saving model as \'{}\''.format(save_model), fg='yellow')
torch.save(net.state_dict(), save_model)
if not no_test:
click.echo('Testing model using {}'.format(test_dataset))
net.eval()
accuracy = test_net(net, data_path=test_dataset, batch_size=batch_size)
color = 'green' if accuracy > 97. else 'red'
click.secho('Accuracy={}'.format(accuracy), fg=color)
def train(train_data, val_data, fold_idx=None):
train_data = MyDataset(train_data, train_transform)
train_loader = DataLoader(train_data, batch_size=config.batch_size, shuffle=True)
val_data = MyDataset(val_data, val_transform)
val_loader = DataLoader(val_data, batch_size=config.batch_size, shuffle=False)
model = Net(model_name).to(device)
# criterion = nn.CrossEntropyLoss()
criterion = FocalLoss(0.5)
# optimizer = torch.optim.Adam(model.parameters(), lr=1e-3)
# scheduler = optim.lr_scheduler.ExponentialLR(optimizer, gamma=0.1)
optimizer = Ranger(model.parameters(), lr=1e-3, weight_decay=0.0005)
# scheduler = optim.lr_scheduler.StepLR(optimizer, step_size=5, gamma=0.1)
scheduler = torch.optim.lr_scheduler.CosineAnnealingLR(optimizer, T_max=4)
if fold_idx is None:
print('start')
model_save_path = os.path.join(config.model_path, '{}.bin'.format(model_name))
else:
print('start fold: {}'.format(fold_idx + 1))
model_save_path = os.path.join(config.model_path, '{}_fold{}.bin'.format(model_name, fold_idx))
# if os.path.isfile(model_save_path):
# print('加载之前的训练模型')
# model.load_state_dict(torch.load(model_save_path))
best_val_score = 0
best_val_score_cnt = 0
last_improved_epoch = 0
adjust_lr_num = 0
for cur_epoch in range(config.epochs_num):
start_time = int(time.time())
model.train()
print('epoch:{}, step:{}'.format(cur_epoch + 1, len(train_loader)))
cur_step = 0
for batch_x, batch_y in train_loader:
batch_x, batch_y = batch_x.to(device), batch_y.to(device)
optimizer.zero_grad()
probs = model(batch_x)
train_loss = criterion(probs, batch_y)
train_loss.backward()
optimizer.step()
cur_step += 1
if cur_step % config.train_print_step == 0:
train_acc = accuracy(probs, batch_y)
msg = 'the current step: {0}/{1}, train loss: {2:>5.2}, train acc: {3:>6.2%}'
print(msg.format(cur_step, len(train_loader), train_loss.item(), train_acc[0].item()))
val_loss, val_score = evaluate(model, val_loader, criterion)
if val_score >= best_val_score:
if val_score == best_val_score:
best_val_score_cnt += 1
best_val_score = val_score
torch.save(model.state_dict(), model_save_path)
improved_str = '*'
last_improved_epoch = cur_epoch
else:
improved_str = ''
msg = 'the current epoch: {0}/{1}, val loss: {2:>5.2}, val acc: {3:>6.2%}, cost: {4}s {5}'
end_time = int(time.time())
print(msg.format(cur_epoch + 1, config.epochs_num, val_loss, val_score,
end_time - start_time, improved_str))
if cur_epoch - last_improved_epoch >= config.patience_epoch or best_val_score_cnt >= 3:
if adjust_lr_num >= config.adjust_lr_num:
print("No optimization for a long time, auto stopping...")
break
print("No optimization for a long time, adjust lr...")
# scheduler.step()
last_improved_epoch = cur_epoch # 加上，不然会连续更新的
adjust_lr_num += 1
best_val_score_cnt = 0
scheduler.step()
del model
gc.collect()
if fold_idx is not None:
model_score[fold_idx] = best_val_score
def train(train_data, val_data, fold_idx=None):
train_data = MyDataset(train_data, train_transform)
train_loader = DataLoader(train_data, batch_size=config.batch_size, shuffle=True)
val_data = MyDataset(val_data, val_transform)
val_loader = DataLoader(val_data, batch_size=config.batch_size, shuffle=False)
model = Net(model_name).to(device)
criterion = nn.CrossEntropyLoss()
# criterion = FocalLoss(0.5)
optimizer = torch.optim.Adam(model.parameters(), lr=1e-3)
# optimizer = torch.optim.Adagrad(model.parameters(), lr=1e-3)
scheduler = optim.lr_scheduler.StepLR(optimizer, step_size=5, gamma=0.1)
# config.model_save_path = os.path.join(config.model_path, '{}.bin'.format(model_name))
best_val_acc = 0
last_improved_epoch = 0
if fold_idx is None:
print('start')
model_save_path = os.path.join(config.model_path, '{}.bin'.format(model_name))
else:
print('start fold: {}'.format(fold_idx + 1))
model_save_path = os.path.join(config.model_path, '{}_fold{}.bin'.format(model_name, fold_idx))
for cur_epoch in range(config.epochs_num):
start_time = int(time.time())
model.train()
print('epoch: ', cur_epoch + 1)
cur_step = 0
for batch_x, batch_y in train_loader:
batch_x, batch_y = batch_x.to(device), batch_y.to(device)
optimizer.zero_grad()
probs = model(batch_x)
train_loss = criterion(probs, batch_y)
train_loss.backward()
optimizer.step()
cur_step += 1
if cur_step % config.train_print_step == 0:
train_acc = accuracy(probs, batch_y)
msg = 'the current step: {0}/{1}, train loss: {2:>5.2}, train acc: {3:>6.2%}'
print(msg.format(cur_step, len(train_loader), train_loss.item(), train_acc[0].item()))
val_loss, val_acc = evaluate(model, val_loader, criterion)
if val_acc >= best_val_acc:
best_val_acc = val_acc
torch.save(model.state_dict(), model_save_path)
improved_str = '*'
last_improved_epoch = cur_epoch
else:
improved_str = ''
# msg = 'the current epoch: {0}/{1}, train loss: {2:>5.2}, train acc: {3:>6.2%}, ' \
# 'val loss: {4:>5.2}, val acc: {5:>6.2%}, {6}'
msg = 'the current epoch: {0}/{1}, val loss: {2:>5.2}, val acc: {3:>6.2%}, cost: {4}s {5}'
end_time = int(time.time())
print(msg.format(cur_epoch + 1, config.epochs_num, val_loss, val_acc,
end_time - start_time, improved_str))
scheduler.step()
if cur_epoch - last_improved_epoch > config.patience_epoch:
print("No optimization for a long time, auto-stopping...")
break
del model
gc.collect()
def adjust_learning_rate(optimizer, lr, gamma, step):
lr = lr * (gamma**(step))
for param_group in optimizer.param_groups:
param_group['lr'] = lr
if __name__ == "__main__":
# 1.获取命令行参数、创建网络、加载网络参数
args = getArgs()
model = Net('train')
print('-- Loading weights into state dict...')
pretrained_dict = torch.load(
args.weight_path,
map_location='cuda' if torch.cuda.is_available() else 'cpu')
model_dict = model.state_dict()
pretrained_dict = {
k: v
for k, v in pretrained_dict.items()
if np.shape(model_dict[k]) == np.shape(v)
}
model_dict.update(pretrained_dict)
model.load_state_dict(model_dict)
print('-- Loading weights finished.')
# 2.多GPU并行
if torch.cuda.is_available():
model = torch.nn.DataParallel(model)
cudnn.benchmark = True
model = model.cuda()
# 3.创建计算loss的类
criterion = MultiBoxLoss()
