main.py

import argparse
import datetime
import json
import random
import time
from pathlib import Path

import numpy as np
import torch
from torch.utils.data import DataLoader
import datasets

from util.motdet_eval import motdet_evaluate, detmotdet_evaluate
from util.tool import load_model
import util.misc as utils
import datasets.samplers as samplers
from datasets import build_dataset, get_coco_api_from_dataset
from engine import evaluate, train_one_epoch, train_one_epoch_mot
from models import build_model
from torch.utils.tensorboard import SummaryWriter

def get_args_parser():
    parser = argparse.ArgumentParser('Deformable DETR Detector', add_help=False)
    parser.add_argument('--lr', default=2e-4, type=float)
    parser.add_argument('--lr_backbone_names', default=["backbone.0"], type=str, nargs='+')
    parser.add_argument('--lr_backbone', default=2e-5, type=float)
    parser.add_argument('--lr_linear_proj_names', default=['reference_points', 'sampling_offsets',], type=str, nargs='+')
    parser.add_argument('--lr_linear_proj_mult', default=0.1, type=float)
    parser.add_argument('--batch_size', default=2, type=int)
    parser.add_argument('--weight_decay', default=1e-4, type=float)
    parser.add_argument('--epochs', default=50, type=int)
    parser.add_argument('--lr_drop', default=40, type=int)
    parser.add_argument('--save_period', default=50, type=int)
    parser.add_argument('--lr_drop_epochs', default=None, type=int, nargs='+')
    parser.add_argument('--clip_max_norm', default=0.1, type=float,
                        help='gradient clipping max norm')

    parser.add_argument('--meta_arch', default='deformable_detr', type=str)

    parser.add_argument('--sgd', action='store_true')

    # Variants of Deformable DETR
    parser.add_argument('--with_box_refine', default=False, action='store_true')
    parser.add_argument('--two_stage', default=False, action='store_true')
    parser.add_argument('--accurate_ratio', default=False, action='store_true')

    # Model parameters
    parser.add_argument('--frozen_weights', type=str, default=None,
                        help="Path to the pretrained model. If set, only the mask head will be trained")
    parser.add_argument('--num_anchors', default=1, type=int)

    # * Backbone
    parser.add_argument('--backbone', default='resnet50', type=str,
                        help="Name of the convolutional backbone to use")
    parser.add_argument('--enable_fpn', action='store_true')
    parser.add_argument('--dilation', action='store_true',
                        help="If true, we replace stride with dilation in the last convolutional block (DC5)")
    parser.add_argument('--position_embedding', default='sine', type=str, choices=('sine', 'learned'),
                        help="Type of positional embedding to use on top of the image features")
    parser.add_argument('--position_embedding_scale', default=2 * np.pi, type=float,
                        help="position / size * scale")
    parser.add_argument('--num_feature_levels', default=4, type=int, help='number of feature levels')

    # * Transformer
    parser.add_argument('--enc_layers', default=6, type=int,
                        help="Number of encoding layers in the transformer")
    parser.add_argument('--dec_layers', default=6, type=int,
                        help="Number of decoding layers in the transformer")
    parser.add_argument('--dim_feedforward', default=1024, type=int,
                        help="Intermediate size of the feedforward layers in the transformer blocks")
    parser.add_argument('--hidden_dim', default=256, type=int,
                        help="Size of the embeddings (dimension of the transformer)")
    parser.add_argument('--dropout', default=0.1, type=float,
                        help="Dropout applied in the transformer")
    parser.add_argument('--nheads', default=8, type=int,
                        help="Number of attention heads inside the transformer's attentions")
    parser.add_argument('--num_queries', default=300, type=int,
                        help="Number of query slots")
    parser.add_argument('--dec_n_points', default=4, type=int)
    parser.add_argument('--enc_n_points', default=4, type=int)
    parser.add_argument('--decoder_cross_self', default=False, action='store_true')
    parser.add_argument('--sigmoid_attn', default=False, action='store_true')
    parser.add_argument('--crop', action='store_true')
    parser.add_argument('--cj', action='store_true')
    parser.add_argument('--extra_track_attn', action='store_true')
    parser.add_argument('--loss_normalizer', action='store_true')
    parser.add_argument('--max_size', default=1333, type=int)
    parser.add_argument('--val_width', default=800, type=int)
    parser.add_argument('--filter_ignore', action='store_true')

    # * Segmentation
    parser.add_argument('--masks', action='store_true',
                        help="Train segmentation head if the flag is provided")

    # Loss
    parser.add_argument('--no_aux_loss', dest='aux_loss', action='store_false',
                        help="Disables auxiliary decoding losses (loss at each layer)")

    # * Matcher
    parser.add_argument('--mix_match', action='store_true',)
    parser.add_argument('--set_cost_class', default=2, type=float,
                        help="Class coefficient in the matching cost")
    parser.add_argument('--set_cost_bbox', default=5, type=float,
                        help="L1 box coefficient in the matching cost")
    parser.add_argument('--set_cost_giou', default=2, type=float,
                        help="giou box coefficient in the matching cost")

    # * Loss coefficients
    parser.add_argument('--mask_loss_coef', default=1, type=float)
    parser.add_argument('--dice_loss_coef', default=1, type=float)
    parser.add_argument('--cls_loss_coef', default=2, type=float)
    parser.add_argument('--bbox_loss_coef', default=5, type=float)
    parser.add_argument('--giou_loss_coef', default=2, type=float)
    parser.add_argument('--focal_alpha', default=0.25, type=float)

    # dataset parameters
    parser.add_argument('--dataset_file', default='coco')
    parser.add_argument('--gt_file_train', type=str)
    parser.add_argument('--gt_file_val', type=str)
    parser.add_argument('--coco_path', default='/data/workspace/detectron2/datasets/coco/', type=str)
    parser.add_argument('--coco_panoptic_path', type=str)
    parser.add_argument('--remove_difficult', action='store_true')

    parser.add_argument('--output_dir', default='',
                        help='path where to save, empty for no saving')
    parser.add_argument('--device', default='cuda',
                        help='device to use for training / testing')
    parser.add_argument('--seed', default=42, type=int)
    parser.add_argument('--resume', default='', help='resume from checkpoint')
    parser.add_argument('--start_epoch', default=0, type=int, metavar='N',
                        help='start epoch')
    parser.add_argument('--eval', action='store_true')
    parser.add_argument('--vis', action='store_true')
    parser.add_argument('--num_workers', default=1, type=int)
    parser.add_argument('--pretrained', default=None, help='resume from checkpoint')
    parser.add_argument('--cache_mode', default=False, action='store_true', help='whether to cache images on memory')

    # end-to-end mot settings.
    parser.add_argument('--mot_path', default='/data/Dataset/mot', type=str)
    parser.add_argument('--input_video', default='figs/demo.mp4', type=str)
    parser.add_argument('--data_txt_path_train',
                        default='./datasets/data_path/detmot17.train', type=str,
                        help="path to dataset txt split")
    parser.add_argument('--data_txt_path_val',
                        default='./datasets/data_path/detmot17.train', type=str,
                        help="path to dataset txt split")
    parser.add_argument('--img_path', default='data/valid/JPEGImages/')

    parser.add_argument('--sample_mode', type=str, default='fixed_interval')
    parser.add_argument('--sample_interval', type=int, default=1)

    parser.add_argument('--sampler_steps', type=int, nargs='*')
    parser.add_argument('--sampler_lengths', type=int, nargs='*')
    parser.add_argument('--exp_name', default='submit', type=str)
    parser.add_argument('--use_checkpoint', action='store_true', default=False)

    # new
    parser.add_argument('--debug', action='store_true', default=False)
    parser.add_argument('--visibility_thresh', type=float, default=0.0)
    parser.add_argument('--losses', type=str, nargs='*')
    parser.add_argument('--iou_thresh', type=float, default=0.5)
    parser.add_argument('--miss_tolerance', type=float, default=3)
    parser.add_argument('--freeze_det', action='store_true')
    return parser


def main(args):
    utils.init_distributed_mode(args)
    print("git:\n  {}\n".format(utils.get_sha()))

    if args.frozen_weights is not None:
        assert args.masks, "Frozen training is meant for segmentation only"
    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)
    random.seed(seed)

    model, criterion, postprocessors = build_model(args)
    model.to(device)

    model_without_ddp = model
    n_parameters = sum(p.numel() for p in model.parameters() if p.requires_grad)
    print('number of params:', n_parameters)

    dataset_train = build_dataset(image_set='train', args=args)
    dataset_val = build_dataset(image_set='val', args=args)

    if args.distributed:
        if args.cache_mode:
            sampler_train = samplers.NodeDistributedSampler(dataset_train)
            sampler_val = samplers.NodeDistributedSampler(dataset_val, shuffle=False)
        else:
            sampler_train = samplers.DistributedSampler(dataset_train)
            sampler_val = samplers.DistributedSampler(dataset_val, shuffle=False)
    else:
        sampler_train = torch.utils.data.RandomSampler(dataset_train)
        sampler_val = torch.utils.data.SequentialSampler(dataset_val)

    batch_sampler_train = torch.utils.data.BatchSampler(
        sampler_train, args.batch_size, drop_last=True)
    if args.dataset_file in ['e2e_mot', 'e2e_dance', 'mot', 'ori_mot', 'e2e_static_mot', 'e2e_joint']:
        collate_fn = utils.mot_collate_fn
    else:
        collate_fn = utils.collate_fn
    data_loader_train = DataLoader(dataset_train, batch_sampler=batch_sampler_train,
                                   collate_fn=collate_fn, num_workers=args.num_workers,
                                   pin_memory=True)
    data_loader_val = DataLoader(dataset_val, args.batch_size, sampler=sampler_val,
                                 drop_last=False, collate_fn=collate_fn, num_workers=args.num_workers,
                                 pin_memory=True)

    def match_name_keywords(n, name_keywords):
        out = False
        for b in name_keywords:
            if b in n:
                out = True
                break
        return out

    param_dicts = [
        {
            "params":
                [p for n, p in model_without_ddp.named_parameters()
                 if not match_name_keywords(n, args.lr_backbone_names) and not match_name_keywords(n, args.lr_linear_proj_names) and p.requires_grad],
            "lr": args.lr,
        },
        {
            "params": [p for n, p in model_without_ddp.named_parameters() if match_name_keywords(n, args.lr_backbone_names) and p.requires_grad],
            "lr": args.lr_backbone,
        },
        {
            "params": [p for n, p in model_without_ddp.named_parameters() if match_name_keywords(n, args.lr_linear_proj_names) and p.requires_grad],
            "lr": args.lr * args.lr_linear_proj_mult,
        }
    ]
    if args.sgd:
        optimizer = torch.optim.SGD(param_dicts, lr=args.lr, momentum=0.9,
                                    weight_decay=args.weight_decay)
    else:
        optimizer = torch.optim.AdamW(param_dicts, lr=args.lr,
                                      weight_decay=args.weight_decay)
    lr_scheduler = torch.optim.lr_scheduler.StepLR(optimizer, args.lr_drop)

    if args.distributed:
        model = torch.nn.parallel.DistributedDataParallel(model, device_ids=[args.gpu], find_unused_parameters=True)
        model_without_ddp = model.module

    if args.dataset_file == "coco_panoptic":
        # We also evaluate AP during panoptic training, on original coco DS
        coco_val = datasets.coco.build("val", args)
        base_ds = get_coco_api_from_dataset(coco_val)
    else:
        base_ds = get_coco_api_from_dataset(dataset_val)

    if args.frozen_weights is not None:
        checkpoint = torch.load(args.frozen_weights, map_location='cpu')
        model_without_ddp.detr.load_state_dict(checkpoint['model'])

    if args.pretrained is not None:
        model_without_ddp = load_model(model_without_ddp, args.pretrained, freeze_det=args.freeze_det)

    output_dir = Path(args.output_dir)
    if args.resume:
        if args.resume.startswith('https'):
            checkpoint = torch.hub.load_state_dict_from_url(
                args.resume, map_location='cpu', check_hash=True)
        else:
            checkpoint = torch.load(args.resume, map_location='cpu')
        missing_keys, unexpected_keys = model_without_ddp.load_state_dict(checkpoint['model'], strict=False)
        unexpected_keys = [k for k in unexpected_keys if not (k.endswith('total_params') or k.endswith('total_ops'))]
        if len(missing_keys) > 0:
            print('Missing Keys: {}'.format(missing_keys))
        if len(unexpected_keys) > 0:
            print('Unexpected Keys: {}'.format(unexpected_keys))
        if not args.eval and 'optimizer' in checkpoint and 'lr_scheduler' in checkpoint and 'epoch' in checkpoint:
            import copy
            p_groups = copy.deepcopy(optimizer.param_groups)
            optimizer.load_state_dict(checkpoint['optimizer'])
            for pg, pg_old in zip(optimizer.param_groups, p_groups):
                pg['lr'] = pg_old['lr']
                pg['initial_lr'] = pg_old['initial_lr']
            # print(optimizer.param_groups)
            lr_scheduler.load_state_dict(checkpoint['lr_scheduler'])
            # todo: this is a hack for doing experiment that resume from checkpoint and also modify lr scheduler (e.g., decrease lr in advance).
            args.override_resumed_lr_drop = True
            if args.override_resumed_lr_drop:
                print('Warning: (hack) args.override_resumed_lr_drop is set to True, so args.lr_drop would override lr_drop in resumed lr_scheduler.')
                lr_scheduler.step_size = args.lr_drop
                lr_scheduler.base_lrs = list(map(lambda group: group['initial_lr'], optimizer.param_groups))
            lr_scheduler.step(lr_scheduler.last_epoch)
            args.start_epoch = checkpoint['epoch'] + 1
    
    if args.eval:
        test_stats, coco_evaluator = evaluate(model, criterion, postprocessors,
                                              data_loader_val, base_ds, device, args.output_dir)
        if args.output_dir:
            utils.save_on_master(coco_evaluator.coco_eval["bbox"].eval, output_dir / "eval.pth")
        return

    print("Start training")
    start_time = time.time()
    
    writer = None
    if args.debug and utils.get_local_rank() == 0:
        writer = SummaryWriter(args.output_dir)
    
    train_func = train_one_epoch
    if args.dataset_file in ['e2e_mot', 'e2e_dance', 'mot', 'ori_mot', 'e2e_static_mot', 'e2e_joint']:
        train_func = train_one_epoch_mot
        dataset_train.set_epoch(args.start_epoch)
        dataset_val.set_epoch(args.start_epoch)
    for epoch in range(args.start_epoch, args.epochs):
        if args.distributed:
            sampler_train.set_epoch(epoch)
        train_stats = train_func(
            model, criterion, data_loader_train, optimizer, device, epoch, args.clip_max_norm, writer=writer)
        lr_scheduler.step()
        if args.output_dir:
            checkpoint_paths = [output_dir / 'checkpoint.pth']
            # extra checkpoint before LR drop and every 5 epochs
            if (epoch + 1) % args.lr_drop == 0 or (epoch + 1) % args.save_period == 0 or (((args.epochs >= 100 and (epoch + 1) > 100) or args.epochs < 100) and (epoch + 1) % 5 == 0):
                checkpoint_paths.append(output_dir / f'checkpoint{epoch:04}.pth')
            for checkpoint_path in checkpoint_paths:
                utils.save_on_master({
                    'model': model_without_ddp.state_dict(),
                    'optimizer': optimizer.state_dict(),
                    'lr_scheduler': lr_scheduler.state_dict(),
                    'epoch': epoch,
                    'args': args,
                }, checkpoint_path)
        
        if args.dataset_file not in ['e2e_mot', 'e2e_dance', 'mot', 'ori_mot', 'e2e_static_mot', 'e2e_joint']:
            test_stats, coco_evaluator = evaluate(
                model, criterion, postprocessors, data_loader_val, base_ds, device, args.output_dir
            )

            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}

            if args.output_dir and utils.is_main_process():
                with (output_dir / "log.txt").open("a") as f:
                    f.write(json.dumps(log_stats) + "\n")

                # for evaluation logs
                if coco_evaluator is not None:
                    (output_dir / 'eval').mkdir(exist_ok=True)
                    if "bbox" in coco_evaluator.coco_eval:
                        filenames = ['latest.pth']
                        if epoch % 50 == 0:
                            filenames.append(f'{epoch:03}.pth')
                        for name in filenames:
                            torch.save(coco_evaluator.coco_eval["bbox"].eval,
                                       output_dir / "eval" / name)
        if args.dataset_file in ['e2e_mot', 'e2e_dance', 'mot', 'ori_mot', 'e2e_static_mot', 'e2e_joint']:
            dataset_train.step_epoch()
            dataset_val.step_epoch()
    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('Deformable DETR 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)