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main.py
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main.py
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# --------------------------------------------------------
# Swin Transformer
# Copyright (c) 2021 Microsoft
# Licensed under The MIT License [see LICENSE for details]
# Written by Ze Liu
# --------------------------------------------------------
import os
import time
import json
import random
import argparse
import datetime
import numpy as np
import torch
import torch.backends.cudnn as cudnn
import torch.distributed as dist
from timm.loss import LabelSmoothingCrossEntropy, SoftTargetCrossEntropy
from timm.utils import accuracy, AverageMeter
from config import get_config
from models import build_model
from data import build_loader
from lr_scheduler import build_scheduler
from optimizer import build_optimizer
from logger import create_logger
from utils import load_checkpoint, load_pretrained, save_checkpoint, NativeScalerWithGradNormCount, auto_resume_helper, \
reduce_tensor
def parse_option():
parser = argparse.ArgumentParser('Swin Transformer training and evaluation script', add_help=False)
parser.add_argument('--cfg', type=str, required=True, metavar="FILE", help='path to config file', )
parser.add_argument(
"--opts",
help="Modify config options by adding 'KEY VALUE' pairs. ",
default=None,
nargs='+',
)
# easy config modification
parser.add_argument('--batch-size', type=int, help="batch size for single GPU")
parser.add_argument('--data-path', type=str, help='path to dataset')
parser.add_argument('--zip', action='store_true', help='use zipped dataset instead of folder dataset')
parser.add_argument('--cache-mode', type=str, default='part', choices=['no', 'full', 'part'],
help='no: no cache, '
'full: cache all data, '
'part: sharding the dataset into nonoverlapping pieces and only cache one piece')
parser.add_argument('--pretrained',
help='pretrained weight from checkpoint, could be imagenet22k pretrained weight')
parser.add_argument('--resume', help='resume from checkpoint')
parser.add_argument('--accumulation-steps', type=int, help="gradient accumulation steps")
parser.add_argument('--use-checkpoint', action='store_true',
help="whether to use gradient checkpointing to save memory")
parser.add_argument('--disable_amp', action='store_true', help='Disable pytorch amp')
parser.add_argument('--amp-opt-level', type=str, choices=['O0', 'O1', 'O2'],
help='mixed precision opt level, if O0, no amp is used (deprecated!)')
parser.add_argument('--output', default='output', type=str, metavar='PATH',
help='root of output folder, the full path is <output>/<model_name>/<tag> (default: output)')
parser.add_argument('--tag', help='tag of experiment')
parser.add_argument('--eval', action='store_true', help='Perform evaluation only')
parser.add_argument('--throughput', action='store_true', help='Test throughput only')
# distributed training
parser.add_argument("--local_rank", type=int, required=True, help='local rank for DistributedDataParallel')
# for acceleration
parser.add_argument('--fused_window_process', action='store_true', help='Fused window shift & window partition, similar for reversed part.')
args, unparsed = parser.parse_known_args()
config = get_config(args)
return args, config
def main(config):
dataset_train, dataset_val, data_loader_train, data_loader_val, mixup_fn = build_loader(config)
logger.info(f"Creating model:{config.MODEL.TYPE}/{config.MODEL.NAME}")
model = build_model(config)
logger.info(str(model))
n_parameters = sum(p.numel() for p in model.parameters() if p.requires_grad)
logger.info(f"number of params: {n_parameters}")
if hasattr(model, 'flops'):
flops = model.flops()
logger.info(f"number of GFLOPs: {flops / 1e9}")
model.cuda()
model_without_ddp = model
optimizer = build_optimizer(config, model)
model = torch.nn.parallel.DistributedDataParallel(model, device_ids=[config.LOCAL_RANK], broadcast_buffers=False)
loss_scaler = NativeScalerWithGradNormCount()
if config.TRAIN.ACCUMULATION_STEPS > 1:
lr_scheduler = build_scheduler(config, optimizer, len(data_loader_train) // config.TRAIN.ACCUMULATION_STEPS)
else:
lr_scheduler = build_scheduler(config, optimizer, len(data_loader_train))
if config.AUG.MIXUP > 0.:
# smoothing is handled with mixup label transform
criterion = SoftTargetCrossEntropy()
elif config.MODEL.LABEL_SMOOTHING > 0.:
criterion = LabelSmoothingCrossEntropy(smoothing=config.MODEL.LABEL_SMOOTHING)
else:
criterion = torch.nn.CrossEntropyLoss()
max_accuracy = 0.0
if config.TRAIN.AUTO_RESUME:
resume_file = auto_resume_helper(config.OUTPUT)
if resume_file:
if config.MODEL.RESUME:
logger.warning(f"auto-resume changing resume file from {config.MODEL.RESUME} to {resume_file}")
config.defrost()
config.MODEL.RESUME = resume_file
config.freeze()
logger.info(f'auto resuming from {resume_file}')
else:
logger.info(f'no checkpoint found in {config.OUTPUT}, ignoring auto resume')
if config.MODEL.RESUME:
max_accuracy = load_checkpoint(config, model_without_ddp, optimizer, lr_scheduler, loss_scaler, logger)
acc1, acc5, loss = validate(config, data_loader_val, model)
logger.info(f"Accuracy of the network on the {len(dataset_val)} test images: {acc1:.1f}%")
if config.EVAL_MODE:
return
if config.MODEL.PRETRAINED and (not config.MODEL.RESUME):
load_pretrained(config, model_without_ddp, logger)
acc1, acc5, loss = validate(config, data_loader_val, model)
logger.info(f"Accuracy of the network on the {len(dataset_val)} test images: {acc1:.1f}%")
if config.THROUGHPUT_MODE:
throughput(data_loader_val, model, logger)
return
logger.info("Start training")
start_time = time.time()
for epoch in range(config.TRAIN.START_EPOCH, config.TRAIN.EPOCHS):
data_loader_train.sampler.set_epoch(epoch)
train_one_epoch(config, model, criterion, data_loader_train, optimizer, epoch, mixup_fn, lr_scheduler,
loss_scaler)
if dist.get_rank() == 0 and (epoch % config.SAVE_FREQ == 0 or epoch == (config.TRAIN.EPOCHS - 1)):
save_checkpoint(config, epoch, model_without_ddp, max_accuracy, optimizer, lr_scheduler, loss_scaler,
logger)
acc1, acc5, loss = validate(config, data_loader_val, model)
logger.info(f"Accuracy of the network on the {len(dataset_val)} test images: {acc1:.1f}%")
max_accuracy = max(max_accuracy, acc1)
logger.info(f'Max accuracy: {max_accuracy:.2f}%')
total_time = time.time() - start_time
total_time_str = str(datetime.timedelta(seconds=int(total_time)))
logger.info('Training time {}'.format(total_time_str))
def train_one_epoch(config, model, criterion, data_loader, optimizer, epoch, mixup_fn, lr_scheduler, loss_scaler):
model.train()
optimizer.zero_grad()
num_steps = len(data_loader)
batch_time = AverageMeter()
loss_meter = AverageMeter()
norm_meter = AverageMeter()
scaler_meter = AverageMeter()
start = time.time()
end = time.time()
for idx, (samples, targets) in enumerate(data_loader):
samples = samples.cuda(non_blocking=True)
targets = targets.cuda(non_blocking=True)
if mixup_fn is not None:
samples, targets = mixup_fn(samples, targets)
with torch.cuda.amp.autocast(enabled=config.AMP_ENABLE):
outputs = model(samples)
loss = criterion(outputs, targets)
loss = loss / config.TRAIN.ACCUMULATION_STEPS
# this attribute is added by timm on one optimizer (adahessian)
is_second_order = hasattr(optimizer, 'is_second_order') and optimizer.is_second_order
grad_norm = loss_scaler(loss, optimizer, clip_grad=config.TRAIN.CLIP_GRAD,
parameters=model.parameters(), create_graph=is_second_order,
update_grad=(idx + 1) % config.TRAIN.ACCUMULATION_STEPS == 0)
if (idx + 1) % config.TRAIN.ACCUMULATION_STEPS == 0:
optimizer.zero_grad()
lr_scheduler.step_update((epoch * num_steps + idx) // config.TRAIN.ACCUMULATION_STEPS)
loss_scale_value = loss_scaler.state_dict()["scale"]
torch.cuda.synchronize()
loss_meter.update(loss.item(), targets.size(0))
if grad_norm is not None: # loss_scaler return None if not update
norm_meter.update(grad_norm)
scaler_meter.update(loss_scale_value)
batch_time.update(time.time() - end)
end = time.time()
if idx % config.PRINT_FREQ == 0:
lr = optimizer.param_groups[0]['lr']
wd = optimizer.param_groups[0]['weight_decay']
memory_used = torch.cuda.max_memory_allocated() / (1024.0 * 1024.0)
etas = batch_time.avg * (num_steps - idx)
logger.info(
f'Train: [{epoch}/{config.TRAIN.EPOCHS}][{idx}/{num_steps}]\t'
f'eta {datetime.timedelta(seconds=int(etas))} lr {lr:.6f}\t wd {wd:.4f}\t'
f'time {batch_time.val:.4f} ({batch_time.avg:.4f})\t'
f'loss {loss_meter.val:.4f} ({loss_meter.avg:.4f})\t'
f'grad_norm {norm_meter.val:.4f} ({norm_meter.avg:.4f})\t'
f'loss_scale {scaler_meter.val:.4f} ({scaler_meter.avg:.4f})\t'
f'mem {memory_used:.0f}MB')
epoch_time = time.time() - start
logger.info(f"EPOCH {epoch} training takes {datetime.timedelta(seconds=int(epoch_time))}")
@torch.no_grad()
def validate(config, data_loader, model):
criterion = torch.nn.CrossEntropyLoss()
model.eval()
batch_time = AverageMeter()
loss_meter = AverageMeter()
acc1_meter = AverageMeter()
acc5_meter = AverageMeter()
end = time.time()
for idx, (images, target) in enumerate(data_loader):
images = images.cuda(non_blocking=True)
target = target.cuda(non_blocking=True)
# compute output
with torch.cuda.amp.autocast(enabled=config.AMP_ENABLE):
output = model(images)
# measure accuracy and record loss
loss = criterion(output, target)
acc1, acc5 = accuracy(output, target, topk=(1, 5))
acc1 = reduce_tensor(acc1)
acc5 = reduce_tensor(acc5)
loss = reduce_tensor(loss)
loss_meter.update(loss.item(), target.size(0))
acc1_meter.update(acc1.item(), target.size(0))
acc5_meter.update(acc5.item(), target.size(0))
# measure elapsed time
batch_time.update(time.time() - end)
end = time.time()
if idx % config.PRINT_FREQ == 0:
memory_used = torch.cuda.max_memory_allocated() / (1024.0 * 1024.0)
logger.info(
f'Test: [{idx}/{len(data_loader)}]\t'
f'Time {batch_time.val:.3f} ({batch_time.avg:.3f})\t'
f'Loss {loss_meter.val:.4f} ({loss_meter.avg:.4f})\t'
f'Acc@1 {acc1_meter.val:.3f} ({acc1_meter.avg:.3f})\t'
f'Acc@5 {acc5_meter.val:.3f} ({acc5_meter.avg:.3f})\t'
f'Mem {memory_used:.0f}MB')
logger.info(f' * Acc@1 {acc1_meter.avg:.3f} Acc@5 {acc5_meter.avg:.3f}')
return acc1_meter.avg, acc5_meter.avg, loss_meter.avg
@torch.no_grad()
def throughput(data_loader, model, logger):
model.eval()
for idx, (images, _) in enumerate(data_loader):
images = images.cuda(non_blocking=True)
batch_size = images.shape[0]
for i in range(50):
model(images)
torch.cuda.synchronize()
logger.info(f"throughput averaged with 30 times")
tic1 = time.time()
for i in range(30):
model(images)
torch.cuda.synchronize()
tic2 = time.time()
logger.info(f"batch_size {batch_size} throughput {30 * batch_size / (tic2 - tic1)}")
return
if __name__ == '__main__':
args, config = parse_option()
if config.AMP_OPT_LEVEL:
print("[warning] Apex amp has been deprecated, please use pytorch amp instead!")
if 'RANK' in os.environ and 'WORLD_SIZE' in os.environ:
rank = int(os.environ["RANK"])
world_size = int(os.environ['WORLD_SIZE'])
print(f"RANK and WORLD_SIZE in environ: {rank}/{world_size}")
else:
rank = -1
world_size = -1
torch.cuda.set_device(config.LOCAL_RANK)
torch.distributed.init_process_group(backend='nccl', init_method='env://', world_size=world_size, rank=rank)
torch.distributed.barrier()
seed = config.SEED + dist.get_rank()
torch.manual_seed(seed)
torch.cuda.manual_seed(seed)
np.random.seed(seed)
random.seed(seed)
cudnn.benchmark = True
# linear scale the learning rate according to total batch size, may not be optimal
linear_scaled_lr = config.TRAIN.BASE_LR * config.DATA.BATCH_SIZE * dist.get_world_size() / 512.0
linear_scaled_warmup_lr = config.TRAIN.WARMUP_LR * config.DATA.BATCH_SIZE * dist.get_world_size() / 512.0
linear_scaled_min_lr = config.TRAIN.MIN_LR * config.DATA.BATCH_SIZE * dist.get_world_size() / 512.0
# gradient accumulation also need to scale the learning rate
if config.TRAIN.ACCUMULATION_STEPS > 1:
linear_scaled_lr = linear_scaled_lr * config.TRAIN.ACCUMULATION_STEPS
linear_scaled_warmup_lr = linear_scaled_warmup_lr * config.TRAIN.ACCUMULATION_STEPS
linear_scaled_min_lr = linear_scaled_min_lr * config.TRAIN.ACCUMULATION_STEPS
config.defrost()
config.TRAIN.BASE_LR = linear_scaled_lr
config.TRAIN.WARMUP_LR = linear_scaled_warmup_lr
config.TRAIN.MIN_LR = linear_scaled_min_lr
config.freeze()
os.makedirs(config.OUTPUT, exist_ok=True)
logger = create_logger(output_dir=config.OUTPUT, dist_rank=dist.get_rank(), name=f"{config.MODEL.NAME}")
if dist.get_rank() == 0:
path = os.path.join(config.OUTPUT, "config.json")
with open(path, "w") as f:
f.write(config.dump())
logger.info(f"Full config saved to {path}")
# print config
logger.info(config.dump())
logger.info(json.dumps(vars(args)))
main(config)