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train.py
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train.py
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import argparse
import math
from tqdm import tqdm
import numpy as np
import os
import os.path as osp
import torch
from torch.optim import SGD, Adam, AdamW, lr_scheduler
from torch.cuda import amp
from model import build_unet3plus, UNet3Plus
from torch.utils.data import DataLoader
from datasets import build_data_loader
from config.config import cfg
from utils.loss import build_u3p_loss
from utils.logger import AverageMeter, SummaryLogger
from utils.metrics import StreamSegMetrics
def one_cycle(y1=0.0, y2=1.0, steps=100):
return lambda x: ((1 - math.cos(x * math.pi / steps)) / 2) * (y2 - y1) + y1
class Trainer:
global_iter = 0
start_epoch = 0
epoch = 0 # current epoch
loss_dict = dict()
val_loss_dict = dict()
val_score_dict = None
best_val_score_dict = None
def __init__(self, cfg, model, train_loader, val_loader):
self.cfg_all = cfg
# build metrics
self.metrics = StreamSegMetrics(cfg.data.num_classes)
cfg = self.cfg = cfg.train
save_dir = osp.join(cfg.logger.log_dir, cfg.save_name)
os.makedirs(save_dir, exist_ok=True)
hyp_path = osp.join(save_dir, cfg.save_name+'.yaml')
with open(hyp_path, "w") as f:
f.write(cfg.dump())
self.model: UNet3Plus = model
self.train_loader: DataLoader = train_loader
self.val_loader: DataLoader = val_loader
# build loss
self.criterion = build_u3p_loss(cfg.loss_type, cfg.aux_weight)
self.scaler = amp.GradScaler(enabled=cfg.device == 'cuda') # mixed precision training
# build optimizer
if cfg.optimizer == 'sgd':
self.optimizer = SGD(self.model.parameters(), lr=cfg.lr, weight_decay=cfg.weight_decay, momentum=cfg.momentum, nesterov=cfg.nesterov)
elif cfg.optimizer == 'adam':
self.optimizer = Adam(self.model.parameters(), lr=cfg.lr, weight_decay=cfg.weight_decay)
elif cfg.optimizer == 'adamw':
self.optimizer = AdamW(self.model.parameters(), lr=cfg.lr, weight_decay=cfg.weight_decay)
else:
raise ValueError('Unknown optimizer')
if cfg.scheduler == 'linear':
self.lr_func = lambda x: (1 - x / (cfg.epochs - 1)) * (1.0 - cfg.lrf) + cfg.lrf # linear
elif cfg.scheduler == 'cyclic':
self.lr_func = one_cycle(1, cfg.lrf, cfg.epochs)
else:
raise ValueError('Unknown scheduler')
# build scheduler
self.scheduler = lr_scheduler.LambdaLR(self.optimizer, lr_lambda=self.lr_func)
self.logger = SummaryLogger(self.cfg_all)
self.model.to(cfg.device)
if cfg.resume:
self.resume(cfg.resume)
def resume(self, resume_path):
print('resuming from {}'.format(resume_path))
saved = torch.load(resume_path, map_location=self.cfg.device)
self.model.load_state_dict(saved['state_dict'])
self.optimizer.load_state_dict(saved['optimizer'])
self.scheduler.load_state_dict(saved['scheduler'])
self.scheduler.step()
self.epoch = saved['epoch'] + 1
self.start_epoch = saved['epoch'] + 1
self.global_iter = saved['global_iter']
def train(self):
for epoch in range(self.start_epoch, self.cfg.epochs):
self.logger.info(f'start training {epoch+1}/{self.cfg.epochs}')
self.train_one_epoch()
self.end_train_epoch()
def train_one_epoch(self):
model = self.model
model.train()
device = self.cfg.device
pbar = enumerate(self.train_loader)
num_batches = len(self.train_loader)
batch_size = self.train_loader.batch_size
accum_steps = self.cfg.accum_steps
pbar = tqdm(pbar, total=num_batches, bar_format='{l_bar}{bar:10}{r_bar}{bar:-10b} epoch: ' \
+ f'{self.epoch + 1}/{self.cfg.epochs}') # progress bar
for i, batch in pbar:
self.warmup()
imgs, masks = batch[0].to(device), batch[1].to(device, dtype=torch.long)
self.global_iter += batch_size
with amp.autocast():
preds = model(imgs)
loss, batch_loss_dict = self.criterion(preds, masks)
self.update_loss_dict(self.loss_dict, batch_loss_dict)
self.scaler.scale(loss).backward()
if (i+1) % accum_steps == 0 or i == num_batches - 1:
self.scaler.step(self.optimizer)
self.scaler.update()
self.optimizer.zero_grad()
pbar.close()
def end_train_epoch(self):
self.epoch += 1
if self.epoch % self.cfg.val_interval == 0 or self.epoch == self.cfg.epochs:
val_dict = self.val_score_dict = self.validate()
miou = val_dict['Mean IoU']
if self.best_val_score_dict is None or miou > self.best_val_score_dict['Mean IoU']:
self.best_val_score_dict = val_dict
self.save_checkpoint(self.cfg.save_name + '_best.ckpt')
self.log_results()
self.save_checkpoint(self.cfg.save_name + '_last.ckpt')
self.scheduler.step()
def save_checkpoint(self, save_name):
state = {
'epoch': self.epoch,
'global_iter': self.global_iter,
'state_dict': self.model.state_dict(),
'optimizer': self.optimizer.state_dict(),
'scheduler': self.scheduler.state_dict(),
}
torch.save(state, osp.join(self.cfg.logger.log_dir, self.cfg.save_name, save_name))
def warmup(self):
ni = self.global_iter
warmup_iters = max(self.cfg.warmup_iters, len(self.train_loader.dataset) * 3)
if ni <= warmup_iters:
xi = [0, warmup_iters] # x interp
for j, x in enumerate(self.optimizer.param_groups):
x['lr'] = np.interp(ni, xi, [0.1 if j == 2 else 0.0, x['initial_lr'] * self.lr_func(self.epoch)])
if 'momentum' in x:
x['momentum'] = np.interp(ni, xi, [0.8, self.cfg.momentum])
def update_loss_dict(self, loss_dict, batch_loss_dict=None):
if batch_loss_dict is None:
if loss_dict is None:
return
for k in loss_dict:
loss_dict[k].reset()
elif len(loss_dict) == 0:
for k, v in batch_loss_dict.items():
loss_dict[k] = AverageMeter(val=v)
else:
for k, v in batch_loss_dict.items():
loss_dict[k].update(v)
def log_results(self):
log_dict = {
'Train': {},
'Val': {}
}
for k, v in self.loss_dict.items():
log_dict['Train'][k] = v.avg
self.update_loss_dict(self.loss_dict, None)
log_dict['Train']['lr'] = self.optimizer.param_groups[0]['lr']
for k, v in self.val_loss_dict.items():
log_dict['Val'][k] = v.avg
self.update_loss_dict(self.val_loss_dict, None)
for k, v in self.val_score_dict.items():
if k == 'Class IoU':
print(v)
# self.logger.cmd_logger.info(v)
continue
log_dict['Val'][k] = v
self.logger.summary(log_dict, self.global_iter)
def validate(self):
"""Do validation and return specified samples"""
self.metrics.reset()
self.model.eval()
device = self.cfg.device
pbar = enumerate(self.val_loader)
pbar = tqdm(pbar, total=len(self.val_loader), bar_format='{l_bar}{bar:10}{r_bar}{bar:-10b}') # progress bar
with torch.no_grad():
for i, (images, labels) in pbar:
images = images.to(device)
labels = labels.to(device, dtype=torch.long)
outputs = self.model(images)
preds = outputs.detach().max(dim=1)[1].cpu().numpy()
targets = labels.cpu().numpy()
self.metrics.update(targets, preds)
_, batch_loss_dict = self.criterion(outputs, labels)
self.update_loss_dict(self.val_loss_dict, batch_loss_dict)
score = self.metrics.get_results()
pbar.close()
return score
def main(args):
cfg.merge_from_file(args.cfg)
if args.seed is not None:
cfg.train.seed = int(args.seed)
if args.resume:
cfg.train.resume = args.resume
if args.data_dir:
cfg.data.data_dir = args.data_dir
if args.use_tensorboard is not None:
cfg.train.logger.use_tensorboard = args.use_tensorboard == 1
elif args.use_wandb is not None:
cfg.train.logger.use_wandb = args.use_wandb == 1
cfg.freeze()
print(cfg)
import torch
import random
import numpy as np
seed = 42
torch.cuda.manual_seed_all(seed)
torch.manual_seed(seed)
random.seed(seed)
np.random.seed(seed)
model, data = cfg.model, cfg.data
model = build_unet3plus(data.num_classes, model.encoder, model.skip_ch, model.aux_losses, model.use_cgm, model.pretrained, model.dropout)
# model = UNet_3Plus_DeepSup()
if data.type in ['voc2012', 'voc2012_aug']:
train_loader, val_loader = build_data_loader(data.data_dir, data.batch_size, data.num_workers, data.max_training_samples, data.crop_size)
else:
raise NotImplementedError
trainer = Trainer(cfg, model, train_loader, val_loader)
trainer.train()
if __name__ == '__main__':
parser = argparse.ArgumentParser(description='Train segmentation network')
parser.add_argument('--cfg',
help='experiment configure file name',
default="config/u3p_resnet34_voc.yaml",
type=str)
parser.add_argument('--seed',
help='random seed',
default=None)
parser.add_argument('--resume',
help='resume from checkpoint',
default=None,
type=str)
parser.add_argument('--data_dir',
default=None,
type=str)
parser.add_argument('--use_wandb',
default=None,
type=int)
parser.add_argument('--use_tensorboard',
default=None,
type=int)
args = parser.parse_args()
main(args)