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main.py
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main.py
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import argparse
import datetime
import numpy as np
import time
import torch
import torch.nn as nn
import torch.backends.cudnn as cudnn
import json
import os
from pathlib import Path
from timm.data.mixup import Mixup
from timm.models import create_model
from timm.loss import LabelSmoothingCrossEntropy, SoftTargetCrossEntropy
from timm.utils import ModelEma
from optim_factory import create_optimizer, LayerDecayValueAssigner
from datasets import build_dataset
from engine import train_one_epoch, evaluate
from utils import NativeScalerWithGradNormCount as NativeScaler
import utils
import models.convnext
import models.vision_transformer
def str2bool(v):
"""
Converts string to bool type; enables command line
arguments in the format of '--arg1 true --arg2 false'
"""
if isinstance(v, bool):
return v
if v.lower() in ('yes', 'true', 't', 'y', '1'):
return True
elif v.lower() in ('no', 'false', 'f', 'n', '0'):
return False
else:
raise argparse.ArgumentTypeError('Boolean value expected.')
def get_args_parser():
parser = argparse.ArgumentParser('ConvNeXt training and evaluation script for image classification', add_help=False)
parser.add_argument('--batch_size', default=64, type=int,
help='Per GPU batch size')
parser.add_argument('--epochs', default=300, type=int)
parser.add_argument('--update_freq', default=1, type=int,
help='gradient accumulation steps')
# Model parameters
parser.add_argument('--model', default='convnext_tiny', type=str, metavar='MODEL',
help='Name of model to train')
parser.add_argument('--input_size', default=224, type=int,
help='image input size')
parser.add_argument('--layer_scale_init_value', default=1e-6, type=float,
help="Layer scale initial values")
# EMA related parameters
parser.add_argument('--model_ema', type=str2bool, default=False)
parser.add_argument('--model_ema_decay', type=float, default=0.9999, help='')
parser.add_argument('--model_ema_force_cpu', type=str2bool, default=False, help='')
parser.add_argument('--model_ema_eval', type=str2bool, default=False, help='Using ema to eval during training.')
# Optimization parameters
parser.add_argument('--opt', default='adamw', type=str, metavar='OPTIMIZER',
help='Optimizer (default: "adamw"')
parser.add_argument('--opt_eps', default=1e-8, type=float, metavar='EPSILON',
help='Optimizer Epsilon (default: 1e-8)')
parser.add_argument('--opt_betas', default=None, type=float, nargs='+', metavar='BETA',
help='Optimizer Betas (default: None, use opt default)')
parser.add_argument('--clip_grad', type=float, default=None, metavar='NORM',
help='Clip gradient norm (default: None, no clipping)')
parser.add_argument('--momentum', type=float, default=0.9, metavar='M',
help='SGD momentum (default: 0.9)')
parser.add_argument('--weight_decay', type=float, default=0.05,
help='weight decay (default: 0.05)')
parser.add_argument('--weight_decay_end', type=float, default=None, help="""Final value of the
weight decay. We use a cosine schedule for WD and using a larger decay by
the end of training improves performance for ViTs.""")
parser.add_argument('--lr', type=float, default=4e-3, metavar='LR',
help='learning rate (default: 4e-3), with total batch size 4096')
parser.add_argument('--layer_decay', type=float, default=1.0)
parser.add_argument('--min_lr', type=float, default=1e-6, metavar='LR',
help='lower lr bound for cyclic schedulers that hit 0 (1e-6)')
parser.add_argument('--warmup_epochs', type=int, default=50, metavar='N',
help='epochs to warmup LR, if scheduler supports')
parser.add_argument('--warmup_steps', type=int, default=-1, metavar='N',
help='num of steps to warmup LR, will overload warmup_epochs if set > 0')
parser.add_argument('--drop_path', type=float, default=0, metavar='PCT',
help='Drop path rate (default: 0.0)')
# Augmentation parameters
parser.add_argument('--color_jitter', type=float, default=0.4, metavar='PCT',
help='Color jitter factor (default: 0.4)')
parser.add_argument('--aa', type=str, default='rand-m9-mstd0.5-inc1', metavar='NAME',
help='Use AutoAugment policy. "v0" or "original". " + "(default: rand-m9-mstd0.5-inc1)'),
parser.add_argument('--smoothing', type=float, default=0.1,
help='Label smoothing (default: 0.1)')
parser.add_argument('--train_interpolation', type=str, default='bicubic',
help='Training interpolation (random, bilinear, bicubic default: "bicubic")')
# Evaluation parameters
parser.add_argument('--crop_pct', type=float, default=None)
# * Random Erase params
parser.add_argument('--reprob', type=float, default=0.25, metavar='PCT',
help='Random erase prob (default: 0.25)')
parser.add_argument('--remode', type=str, default='pixel',
help='Random erase mode (default: "pixel")')
parser.add_argument('--recount', type=int, default=1,
help='Random erase count (default: 1)')
parser.add_argument('--resplit', type=str2bool, default=False,
help='Do not random erase first (clean) augmentation split')
# * Mixup params
parser.add_argument('--mixup', type=float, default=0.8,
help='mixup alpha, mixup enabled if > 0.')
parser.add_argument('--cutmix', type=float, default=1.0,
help='cutmix alpha, cutmix enabled if > 0.')
parser.add_argument('--cutmix_minmax', type=float, nargs='+', default=None,
help='cutmix min/max ratio, overrides alpha and enables cutmix if set (default: None)')
parser.add_argument('--mixup_prob', type=float, default=1.0,
help='Probability of performing mixup or cutmix when either/both is enabled')
parser.add_argument('--mixup_switch_prob', type=float, default=0.5,
help='Probability of switching to cutmix when both mixup and cutmix enabled')
parser.add_argument('--mixup_mode', type=str, default='batch',
help='How to apply mixup/cutmix params. Per "batch", "pair", or "elem"')
# * Finetuning params
parser.add_argument('--initialize', default='',
help='initialize from a model file')
parser.add_argument('--head_init_scale', default=1.0, type=float,
help='classifier head initial scale, typically adjusted in fine-tuning')
parser.add_argument('--model_key', default='model|module', type=str,
help='which key to load from saved state dict, usually model or model_ema')
parser.add_argument('--model_prefix', default='', type=str)
# Dataset parameters
parser.add_argument('--data_path', default='/datasets01/imagenet_full_size/061417/', type=str,
help='dataset path')
parser.add_argument('--eval_data_path', default=None, type=str,
help='dataset path for evaluation')
parser.add_argument('--nb_classes', default=1000, type=int,
help='number of the classification types')
parser.add_argument('--imagenet_default_mean_and_std', type=str2bool, default=True)
parser.add_argument('--data_set', default='IMNET',
type=str, help='dataset path')
parser.add_argument('--output_dir', default='',
help='path where to save, empty for no saving')
parser.add_argument('--log_dir', default=None,
help='path where to tensorboard log')
parser.add_argument('--device', default='cuda',
help='device to use for training / testing')
parser.add_argument('--seed', default=0, type=int)
parser.add_argument('--resume', default='',
help='resume from checkpoint')
parser.add_argument('--auto_resume', type=str2bool, default=True)
parser.add_argument('--save_ckpt', type=str2bool, default=True)
parser.add_argument('--save_ckpt_freq', default=1, type=int)
parser.add_argument('--save_ckpt_num', default=3, type=int)
parser.add_argument('--start_epoch', default=0, type=int, metavar='N',
help='start epoch')
parser.add_argument('--eval', type=str2bool, default=False,
help='Perform evaluation only')
parser.add_argument('--dist_eval', type=str2bool, default=True,
help='Enabling distributed evaluation')
parser.add_argument('--disable_eval', type=str2bool, default=False,
help='Disabling evaluation during training')
parser.add_argument('--num_workers', default=10, type=int)
parser.add_argument('--pin_mem', type=str2bool, default=True,
help='Pin CPU memory in DataLoader for more efficient (sometimes) transfer to GPU.')
# distributed training parameters
parser.add_argument('--world_size', default=1, type=int,
help='number of distributed processes')
parser.add_argument('--local_rank', default=-1, type=int)
parser.add_argument('--dist_on_itp', type=str2bool, default=False)
parser.add_argument('--dist_url', default='env://',
help='url used to set up distributed training')
parser.add_argument('--use_amp', type=str2bool, default=False,
help="Use PyTorch's AMP (Automatic Mixed Precision) or not")
# Weights and Biases arguments
parser.add_argument('--enable_wandb', type=str2bool, default=False,
help="enable logging to Weights and Biases")
parser.add_argument('--project', default='convnext', type=str,
help="The name of the W&B project where you're sending the new run.")
parser.add_argument('--wandb_ckpt', type=str2bool, default=False,
help="Save model checkpoints as W&B Artifacts.")
return parser
def main(args):
utils.init_distributed_mode(args)
print(args)
device = torch.device(args.device)
# fix the seed for reproducibility
seed = args.seed + utils.get_rank()
torch.manual_seed(seed)
np.random.seed(seed)
cudnn.benchmark = True
dataset_train, args.nb_classes = build_dataset(is_train=True, args=args)
if args.disable_eval:
args.dist_eval = False
dataset_val = None
else:
dataset_val, _ = build_dataset(is_train=False, args=args)
num_tasks = utils.get_world_size()
global_rank = utils.get_rank()
sampler_train = torch.utils.data.DistributedSampler(
dataset_train, num_replicas=num_tasks, rank=global_rank, shuffle=True, seed=args.seed,
)
print("Sampler_train = %s" % str(sampler_train))
if args.dist_eval:
if len(dataset_val) % num_tasks != 0:
print('Warning: Enabling distributed evaluation with an eval dataset not divisible by process number. '
'This will slightly alter validation results as extra duplicate entries are added to achieve '
'equal num of samples per-process.')
sampler_val = torch.utils.data.DistributedSampler(
dataset_val, num_replicas=num_tasks, rank=global_rank, shuffle=False)
else:
sampler_val = torch.utils.data.SequentialSampler(dataset_val)
if global_rank == 0 and args.log_dir is not None:
os.makedirs(args.log_dir, exist_ok=True)
log_writer = utils.TensorboardLogger(log_dir=args.log_dir)
else:
log_writer = None
if global_rank == 0 and args.enable_wandb:
wandb_logger = utils.WandbLogger(args)
else:
wandb_logger = None
data_loader_train = torch.utils.data.DataLoader(
dataset_train, sampler=sampler_train,
batch_size=args.batch_size,
num_workers=args.num_workers,
pin_memory=args.pin_mem,
drop_last=True,
)
if dataset_val is not None:
data_loader_val = torch.utils.data.DataLoader(
dataset_val, sampler=sampler_val,
batch_size=int(1.5 * args.batch_size),
num_workers=args.num_workers,
pin_memory=args.pin_mem,
drop_last=False
)
else:
data_loader_val = None
mixup_fn = None
mixup_active = args.mixup > 0 or args.cutmix > 0. or args.cutmix_minmax is not None
if mixup_active:
print("Mixup is activated!")
mixup_fn = Mixup(
mixup_alpha=args.mixup, cutmix_alpha=args.cutmix, cutmix_minmax=args.cutmix_minmax,
prob=args.mixup_prob, switch_prob=args.mixup_switch_prob, mode=args.mixup_mode,
label_smoothing=args.smoothing, num_classes=args.nb_classes)
model = utils.build_model(args)
if args.initialize:
if args.initialize.startswith('https'):
checkpoint = torch.hub.load_state_dict_from_url(
args.initialize, map_location='cpu', check_hash=True)
else:
checkpoint = torch.load(args.initialize, map_location='cpu')
print("Load initialization from %s" % args.initialize)
checkpoint_model = None
for model_key in args.model_key.split('|'):
if model_key in checkpoint:
checkpoint_model = checkpoint[model_key]
print("Load state_dict by model_key = %s" % model_key)
break
if checkpoint_model is None:
checkpoint_model = checkpoint
state_dict = model.state_dict()
for k in ['head.weight', 'head.bias']:
if k in checkpoint_model and checkpoint_model[k].shape != state_dict[k].shape:
print(f"Removing key {k} from pretrained checkpoint")
del checkpoint_model[k]
utils.load_state_dict(model, checkpoint_model, prefix=args.model_prefix)
model.to(device)
model_ema = None
if args.model_ema:
# Important to create EMA model after cuda(), DP wrapper, and AMP but before SyncBN and DDP wrapper
model_ema = ModelEma(
model,
decay=args.model_ema_decay,
device='cpu' if args.model_ema_force_cpu else '',
resume='')
print("Using EMA with decay = %.8f" % args.model_ema_decay)
model_without_ddp = model
n_parameters = sum(p.numel() for p in model.parameters() if p.requires_grad)
print("Model = %s" % str(model_without_ddp))
print('number of params:', n_parameters)
total_batch_size = args.batch_size * args.update_freq * utils.get_world_size()
num_training_steps_per_epoch = len(dataset_train) // total_batch_size
print("LR = %.8f" % args.lr)
print("Batch size = %d" % total_batch_size)
print("Update frequent = %d" % args.update_freq)
print("Number of training examples = %d" % len(dataset_train))
print("Number of training training per epoch = %d" % num_training_steps_per_epoch)
if args.layer_decay < 1.0 or args.layer_decay > 1.0:
num_layers = 12 # convnext layers divided into 12 parts, each with a different decayed lr value.
assert args.model in ['convnext_small', 'convnext_base', 'convnext_large', 'convnext_xlarge'], \
"Layer Decay impl only supports convnext_small/base/large/xlarge"
assigner = LayerDecayValueAssigner(list(args.layer_decay ** (num_layers + 1 - i) for i in range(num_layers + 2)))
else:
assigner = None
if assigner is not None:
print("Assigned values = %s" % str(assigner.values))
if args.distributed:
model = torch.nn.parallel.DistributedDataParallel(model, device_ids=[args.gpu], find_unused_parameters=False)
model_without_ddp = model.module
optimizer = create_optimizer(
args, model_without_ddp, skip_list=None,
get_num_layer=assigner.get_layer_id if assigner is not None else None,
get_layer_scale=assigner.get_scale if assigner is not None else None)
loss_scaler = NativeScaler() # if args.use_amp is False, this won't be used
print("Use Cosine LR scheduler")
lr_schedule_values = utils.cosine_scheduler(
args.lr, args.min_lr, args.epochs, num_training_steps_per_epoch,
warmup_epochs=args.warmup_epochs, warmup_steps=args.warmup_steps,
)
if args.weight_decay_end is None:
args.weight_decay_end = args.weight_decay
wd_schedule_values = utils.cosine_scheduler(
args.weight_decay, args.weight_decay_end, args.epochs, num_training_steps_per_epoch)
print("Max WD = %.7f, Min WD = %.7f" % (max(wd_schedule_values), min(wd_schedule_values)))
if mixup_fn is not None:
# smoothing is handled with mixup label transform
criterion = SoftTargetCrossEntropy()
elif args.smoothing > 0.:
criterion = LabelSmoothingCrossEntropy(smoothing=args.smoothing)
else:
criterion = torch.nn.CrossEntropyLoss()
print("criterion = %s" % str(criterion))
utils.auto_load_model(
args=args, model=model, model_without_ddp=model_without_ddp,
optimizer=optimizer, loss_scaler=loss_scaler, model_ema=model_ema)
if args.eval:
print(f"Eval only mode")
test_stats = evaluate(data_loader_val, model, device, use_amp=args.use_amp)
print(f"Accuracy of the network on {len(dataset_val)} test images: {test_stats['acc1']:.5f}%")
return
max_accuracy = 0.0
if args.model_ema and args.model_ema_eval:
max_accuracy_ema = 0.0
print("Start training for %d epochs" % args.epochs)
start_time = time.time()
for epoch in range(args.start_epoch, args.epochs):
if args.distributed:
data_loader_train.sampler.set_epoch(epoch)
if log_writer is not None:
log_writer.set_step(epoch * num_training_steps_per_epoch * args.update_freq)
if wandb_logger:
wandb_logger.set_steps()
train_stats = train_one_epoch(
model, criterion, data_loader_train, optimizer,
device, epoch, loss_scaler, args.clip_grad, model_ema, mixup_fn,
log_writer=log_writer, wandb_logger=wandb_logger, start_steps=epoch * num_training_steps_per_epoch,
lr_schedule_values=lr_schedule_values, wd_schedule_values=wd_schedule_values,
num_training_steps_per_epoch=num_training_steps_per_epoch, update_freq=args.update_freq,
use_amp=args.use_amp
)
if args.output_dir and args.save_ckpt:
if (epoch + 1) % args.save_ckpt_freq == 0 or epoch + 1 == args.epochs:
utils.save_model(
args=args, model=model, model_without_ddp=model_without_ddp, optimizer=optimizer,
loss_scaler=loss_scaler, epoch=epoch, model_ema=model_ema)
if data_loader_val is not None:
test_stats = evaluate(data_loader_val, model, device, use_amp=args.use_amp)
print(f"Accuracy of the model on the {len(dataset_val)} test images: {test_stats['acc1']:.1f}%")
if max_accuracy < test_stats["acc1"]:
max_accuracy = test_stats["acc1"]
if args.output_dir and args.save_ckpt:
utils.save_model(
args=args, model=model, model_without_ddp=model_without_ddp, optimizer=optimizer,
loss_scaler=loss_scaler, epoch="best", model_ema=model_ema)
print(f'Max accuracy: {max_accuracy:.2f}%')
if log_writer is not None:
log_writer.update(test_acc1=test_stats['acc1'], head="perf", step=epoch)
log_writer.update(test_acc5=test_stats['acc5'], head="perf", step=epoch)
log_writer.update(test_loss=test_stats['loss'], head="perf", step=epoch)
log_stats = {**{f'train_{k}': v for k, v in train_stats.items()},
**{f'test_{k}': v for k, v in test_stats.items()},
'epoch': epoch,
'n_parameters': n_parameters}
# repeat testing routines for EMA, if ema eval is turned on
if args.model_ema and args.model_ema_eval:
test_stats_ema = evaluate(data_loader_val, model_ema.ema, device, use_amp=args.use_amp)
print(f"Accuracy of the model EMA on {len(dataset_val)} test images: {test_stats_ema['acc1']:.1f}%")
if max_accuracy_ema < test_stats_ema["acc1"]:
max_accuracy_ema = test_stats_ema["acc1"]
if args.output_dir and args.save_ckpt:
utils.save_model(
args=args, model=model, model_without_ddp=model_without_ddp, optimizer=optimizer,
loss_scaler=loss_scaler, epoch="best-ema", model_ema=model_ema)
print(f'Max EMA accuracy: {max_accuracy_ema:.2f}%')
if log_writer is not None:
log_writer.update(test_acc1_ema=test_stats_ema['acc1'], head="perf", step=epoch)
log_stats.update({**{f'test_{k}_ema': v for k, v in test_stats_ema.items()}})
else:
log_stats = {**{f'train_{k}': v for k, v in train_stats.items()},
'epoch': epoch,
'n_parameters': n_parameters}
if args.output_dir and utils.is_main_process():
if log_writer is not None:
log_writer.flush()
with open(os.path.join(args.output_dir, "log.txt"), mode="a", encoding="utf-8") as f:
f.write(json.dumps(log_stats) + "\n")
if wandb_logger:
wandb_logger.log_epoch_metrics(log_stats)
if wandb_logger and args.wandb_ckpt and args.save_ckpt and args.output_dir:
wandb_logger.log_checkpoints()
total_time = time.time() - start_time
total_time_str = str(datetime.timedelta(seconds=int(total_time)))
print('Training time {}'.format(total_time_str))
if __name__ == '__main__':
parser = argparse.ArgumentParser('Training and evaluation script', parents=[get_args_parser()])
args = parser.parse_args()
if args.output_dir:
Path(args.output_dir).mkdir(parents=True, exist_ok=True)
main(args)