train_dtu.py

import argparse, os, sys, time, gc, datetime
import torch
import torch.nn as nn
import torch.nn.parallel
import torch.backends.cudnn as cudnn
import torch.optim as optim
from torch.utils.data import DataLoader
from tensorboardX import SummaryWriter
from datasets import find_dataset_def
from models import *
from utils import *
import torch.distributed as dist


parser = argparse.ArgumentParser(description='A PyTorch Implementation of ET-MVSNet')

parser.add_argument('--mode', default='train', help='train or test', choices=['train', 'test'])
parser.add_argument('--device', default='cuda', help='select model')
parser.add_argument("--local_rank", type=int, default=0)
parser.add_argument('--seed', type=int, default=0, metavar='S', help='random seed')

# dataset
parser.add_argument('--dataset', default='dtu_yao4', help='select dataset')
parser.add_argument('--trainpath', help='train datapath')
parser.add_argument('--testpath', help='test datapath')
parser.add_argument('--trainlist', help='train list')
parser.add_argument('--testlist', help='test list')
parser.add_argument('--rt', action='store_true',help='robust training')
parser.add_argument('--max_h', type=int, default=864, help='testing max h')
parser.add_argument('--max_w', type=int, default=1152, help='testing max w')
parser.add_argument('--interval_scale', type=float, default=1.06, help='the number of depth values')
parser.add_argument('--pin_m', action='store_true', help='data loader pin memory')

# training and testing
parser.add_argument('--epochs', type=int, default=15, help='number of epochs to train')
parser.add_argument('--lr', type=float, default=0.001, help='learning rate')
parser.add_argument('--lrepochs', type=str, default="6,8,10,12:2", help='epoch ids to downscale lr and the downscale rate')
parser.add_argument('--wd', type=float, default=0.0, help='weight decay')
parser.add_argument('--batch_size', type=int, default=1, help='train batch size')
parser.add_argument('--loadckpt', default=None, help='load a specific checkpoint')
parser.add_argument('--logdir', default='./checkpoints/debug', help='the directory to save checkpoints/logs')
parser.add_argument('--resume', action='store_true', help='continue to train the model')
parser.add_argument('--summary_freq', type=int, default=1, help='print and summary frequency')
parser.add_argument('--save_freq', type=int, default=1, help='save checkpoint frequency')
parser.add_argument('--eval_freq', type=int, default=1, help='eval freq')
parser.add_argument('--dlossw', type=str, default="1,1,1,1", help='depth loss weight for different stage')
parser.add_argument('--use_raw_train', action='store_true',help='using 1200x1600 training')
parser.add_argument('--lr_scheduler', type=str, default='MS')

# network
parser.add_argument('--ndepths', type=str, default="8,8,4,4", help='ndepths')
parser.add_argument('--depth_inter_r', type=str, default="0.5,0.5,0.5,0.5", help='depth_intervals_ratio')
parser.add_argument("--fpn_base_channel", type=int, default=8)
parser.add_argument("--reg_channel", type=int, default=8)
parser.add_argument('--reg_mode', type=str, default="reg2d")
parser.add_argument('--group_cor', action='store_true',help='group correlation')
parser.add_argument('--group_cor_dim', type=str, default="8,8,4,4", help='group correlation dim')
parser.add_argument('--inverse_depth', action='store_true',help='inverse depth')
parser.add_argument('--agg_type', type=str, default="ConvBnReLU3D", help='cost regularization type')
parser.add_argument('--arch_mode', type=str, default="fpn")
parser.add_argument('--attn_temp', type=float, default=2)


cudnn.benchmark = True
num_gpus = int(os.environ["WORLD_SIZE"]) if "WORLD_SIZE" in os.environ else 1
is_distributed = num_gpus > 1

# main function
def train(model, model_loss, optimizer, TrainImgLoader, TestImgLoader, start_epoch, args):
    milestones = [len(TrainImgLoader) * int(epoch_idx) for epoch_idx in args.lrepochs.split(':')[0].split(',')]
    lr_gamma = 1 / float(args.lrepochs.split(':')[1])
    if args.lr_scheduler == 'MS':
        lr_scheduler = WarmupMultiStepLR(optimizer, milestones, gamma=lr_gamma, warmup_factor=1.0/3, warmup_iters=500,
                                                            last_epoch=len(TrainImgLoader) * start_epoch - 1)
    elif args.lr_scheduler == 'cos':
        lr_scheduler = torch.optim.lr_scheduler.CosineAnnealingLR(optimizer, T_max=int(args.epochs*len(TrainImgLoader)), eta_min=0)
    elif args.lr_scheduler == 'onecycle':
        lr_scheduler = torch.optim.lr_scheduler.OneCycleLR(optimizer, max_lr=args.lr,total_steps=int(args.epochs*len(TrainImgLoader)))

    for epoch_idx in range(start_epoch, args.epochs):
        print('Epoch {}:'.format(epoch_idx))
        global_step = len(TrainImgLoader) * epoch_idx
      
        for batch_idx, sample in enumerate(TrainImgLoader):
            start_time = time.time()
            global_step = len(TrainImgLoader) * epoch_idx + batch_idx
            do_summary = global_step % args.summary_freq == 0
            loss, scalar_outputs, image_outputs = train_sample(model, model_loss, optimizer, sample, args)
            lr_scheduler.step()
            if (not is_distributed) or (dist.get_rank() == 0):
                if do_summary:
                    save_scalars(logger, 'train', scalar_outputs, global_step)
                    save_images(logger, 'train', image_outputs, global_step)
                    print(
                       "Epoch {}/{}, Iter {}/{}, lr {:.6f}, train loss = {:.3f}, ce_loss = {:.3f}, {:.3f}, {:.3f}, {:.3f}, range_err = {:.3f}, {:.3f}, {:.3f}, {:.3f}, time = {:.3f}".format(
                           epoch_idx, args.epochs, batch_idx, len(TrainImgLoader),
                           optimizer.param_groups[0]["lr"], 
                           loss,
                           scalar_outputs["s0_ce_loss"],
                           scalar_outputs["s1_ce_loss"],
                           scalar_outputs["s2_ce_loss"],
                           scalar_outputs["s3_ce_loss"],
                           scalar_outputs["s0_range_err_ratio"],
                           scalar_outputs["s1_range_err_ratio"],
                           scalar_outputs["s2_range_err_ratio"],
                           scalar_outputs["s3_range_err_ratio"],
                           time.time() - start_time))
                del scalar_outputs, image_outputs

        # checkpoint
        if (not is_distributed) or (dist.get_rank() == 0):
            if (epoch_idx + 1) % args.save_freq == 0:
                torch.save({
                    'epoch': epoch_idx,
                    'model': model.module.state_dict(),
                    'optimizer': optimizer.state_dict()},
                    "{}/finalmodel_{}.ckpt".format(args.logdir,epoch_idx)) 

        gc.collect()

        # testing
        if (epoch_idx % args.eval_freq == 0) or (epoch_idx == args.epochs - 1):
            avg_test_scalars = DictAverageMeter()
            for batch_idx, sample in enumerate(TestImgLoader):
                start_time = time.time()
                global_step = len(TestImgLoader) * epoch_idx + batch_idx
                do_summary = global_step % args.summary_freq == 0
                loss, scalar_outputs, image_outputs = test_sample_depth(model, model_loss, sample, args)
                if (not is_distributed) or (dist.get_rank() == 0):
                    if do_summary:
                        save_scalars(logger, 'test', scalar_outputs, global_step)
                        save_images(logger, 'test', image_outputs, global_step)
                        print(
                            "Epoch {}/{}, Iter {}/{}, lr {:.6f}, test loss = {:.3f}, ce_loss = {:.3f}, {:.3f}, {:.3f}, {:.3f}, range_err = {:.3f}, {:.3f}, {:.3f}, {:.3f}, time = {:.3f}".format(
                            epoch_idx, args.epochs, batch_idx, len(TestImgLoader),
                               optimizer.param_groups[0]["lr"], 
                           loss,
                           scalar_outputs["s0_ce_loss"],
                           scalar_outputs["s1_ce_loss"],
                           scalar_outputs["s2_ce_loss"],
                           scalar_outputs["s3_ce_loss"],
                           scalar_outputs["s0_range_err_ratio"],
                           scalar_outputs["s1_range_err_ratio"],
                           scalar_outputs["s2_range_err_ratio"],
                           scalar_outputs["s3_range_err_ratio"],
                            time.time() - start_time))
                    avg_test_scalars.update(scalar_outputs)
                    del scalar_outputs, image_outputs

            if (not is_distributed) or (dist.get_rank() == 0):
                save_scalars(logger, 'fulltest', avg_test_scalars.mean(), global_step)
                print("avg_test_scalars:", avg_test_scalars.mean())
            gc.collect()


def test(model, model_loss, TestImgLoader, args):
    avg_test_scalars = DictAverageMeter()
    for batch_idx, sample in enumerate(TestImgLoader):
        start_time = time.time()
        loss, scalar_outputs, image_outputs = test_sample_depth(model, model_loss, sample, args)
        avg_test_scalars.update(scalar_outputs)
        del scalar_outputs, image_outputs
        if (not is_distributed) or (dist.get_rank() == 0):
            print('Iter {}/{}, test loss = {:.3f}, time = {:3f}'.format(batch_idx, len(TestImgLoader), loss,
                                                                        time.time() - start_time))
            if batch_idx % 100 == 0:
                print("Iter {}/{}, test results = {}".format(batch_idx, len(TestImgLoader), avg_test_scalars.mean()))
    if (not is_distributed) or (dist.get_rank() == 0):
        print("final", avg_test_scalars.mean())


def train_sample(model, model_loss, optimizer, sample, args):
    model.train()
    optimizer.zero_grad()

    sample_cuda = tocuda(sample)
    depth_gt_ms = sample_cuda["depth"]
    mask_ms = sample_cuda["mask"]

    num_stage = len([int(nd) for nd in args.ndepths.split(",") if nd])
    depth_gt = depth_gt_ms["stage{}".format(num_stage)]
    mask = mask_ms["stage{}".format(num_stage)]

    outputs = model(sample_cuda["imgs"], sample_cuda["proj_matrices"], sample_cuda["depth_values"],sample_cuda['flag'])


    depth_est = outputs["depth"]

    loss, stage_ce_loss, range_err_ratio = model_loss(
                                        outputs, depth_gt_ms, mask_ms, stage_lw=[float(e) for e in args.dlossw.split(",") if e], 
                                        inverse_depth=args.inverse_depth
                                        )
    loss.backward()
    optimizer.step()

    scalar_outputs = {"loss": loss,
                      "s0_ce_loss": stage_ce_loss[0],
                      "s1_ce_loss": stage_ce_loss[1],
                      "s2_ce_loss": stage_ce_loss[2],
                      "s3_ce_loss": stage_ce_loss[3],
                      "s0_range_err_ratio":range_err_ratio[0],
                      "s1_range_err_ratio":range_err_ratio[1],
                      "s2_range_err_ratio":range_err_ratio[2],
                      "s3_range_err_ratio":range_err_ratio[3],
                      "abs_depth_error": AbsDepthError_metrics(depth_est, depth_gt, mask > 0.5),
                      "thres2mm_error": Thres_metrics(depth_est, depth_gt, mask > 0.5, 2),
                      "thres4mm_error": Thres_metrics(depth_est, depth_gt, mask > 0.5, 4),
                      "thres8mm_error": Thres_metrics(depth_est, depth_gt, mask > 0.5, 8),}

    image_outputs = {"depth_est": depth_est * mask,
                     "depth_est_nomask": depth_est,
                     "depth_gt": sample["depth"]["stage1"],
                     "ref_img": sample["imgs"][0],
                     "mask": sample["mask"]["stage1"],
                     "errormap": (depth_est - depth_gt).abs() * mask,
                     }

    if is_distributed:
        scalar_outputs = reduce_scalar_outputs(scalar_outputs)

    return tensor2float(scalar_outputs["loss"]), tensor2float(scalar_outputs), tensor2numpy(image_outputs)


@make_nograd_func
def test_sample_depth(model, model_loss, sample, args):
    if is_distributed:
        model_eval = model.module
    else:
        model_eval = model
    model_eval.eval()

    sample_cuda = tocuda(sample)
    depth_gt_ms = sample_cuda["depth"]
    mask_ms = sample_cuda["mask"]

    num_stage = len([int(nd) for nd in args.ndepths.split(",") if nd])
    depth_gt = depth_gt_ms["stage{}".format(num_stage)]
    mask = mask_ms["stage{}".format(num_stage)]

    outputs = model_eval(sample_cuda["imgs"], sample_cuda["proj_matrices"], sample_cuda["depth_values"],sample_cuda['flag'])
    depth_est = outputs["depth"]

    loss, stage_ce_loss, range_err_ratio = model_loss(
                                        outputs, depth_gt_ms, mask_ms, stage_lw=[float(e) for e in args.dlossw.split(",") if e], 
                                        inverse_depth=args.inverse_depth
                                        )
    scalar_outputs = {"loss": loss,
                      "s0_ce_loss": stage_ce_loss[0],
                      "s1_ce_loss": stage_ce_loss[1],
                      "s2_ce_loss": stage_ce_loss[2],
                      "s3_ce_loss": stage_ce_loss[3],
                      "s0_range_err_ratio":range_err_ratio[0],
                      "s1_range_err_ratio":range_err_ratio[1],
                      "s2_range_err_ratio":range_err_ratio[2],
                      "s3_range_err_ratio":range_err_ratio[3],
                      "abs_depth_error": AbsDepthError_metrics(depth_est, depth_gt, mask > 0.5),
                      "thres2mm_error": Thres_metrics(depth_est, depth_gt, mask > 0.5, 2),
                      "thres4mm_error": Thres_metrics(depth_est, depth_gt, mask > 0.5, 4),
                      "thres8mm_error": Thres_metrics(depth_est, depth_gt, mask > 0.5, 8),
                    }

    image_outputs = {"depth_est": depth_est * mask,
                     "depth_est_nomask": depth_est,
                     "depth_gt": sample["depth"]["stage1"],
                     "ref_img": sample["imgs"][0],
                     "mask": sample["mask"]["stage1"],
                     "errormap": (depth_est - depth_gt).abs() * mask}

    if is_distributed:
        scalar_outputs = reduce_scalar_outputs(scalar_outputs)

    return tensor2float(scalar_outputs["loss"]), tensor2float(scalar_outputs), tensor2numpy(image_outputs)


if __name__ == '__main__':
    # parse arguments and check
    args = parser.parse_args()

    if args.resume:
        assert args.mode == "train"
        assert args.loadckpt is None

    if args.testpath is None:
        args.testpath = args.trainpath

    if is_distributed:
        torch.cuda.set_device(args.local_rank)
        torch.distributed.init_process_group(
            backend="nccl", init_method="env://"
        )
        synchronize()

    set_random_seed(args.seed)
    device = torch.device(args.device)

    if (not is_distributed) or (dist.get_rank() == 0):
        # create logger for mode "train" and "testall"
        if args.mode == "train":
            if not os.path.isdir(args.logdir):
                os.makedirs(args.logdir)
            current_time_str = str(datetime.datetime.now().strftime('%Y%m%d_%H%M%S'))
            print("current time", current_time_str)
            print("creating new summary file")
            logger = SummaryWriter(args.logdir)
        print("argv:", sys.argv[1:])
        print_args(args)

    # model, optimizer
    model = MVS4net(arch_mode=args.arch_mode, reg_net=args.reg_mode, num_stage=4, 
                    fpn_base_channel=args.fpn_base_channel, reg_channel=args.reg_channel, 
                    stage_splits=[int(n) for n in args.ndepths.split(",")], 
                    depth_interals_ratio=[float(ir) for ir in args.depth_inter_r.split(",")],
                    group_cor=args.group_cor, group_cor_dim=[int(n) for n in args.group_cor_dim.split(",")],
                    inverse_depth=args.inverse_depth,
                    agg_type=args.agg_type,
                    attn_temp=args.attn_temp,
                )

    model.to(device)
    model_loss = MVS4net_loss

    optimizer = optim.Adam(filter(lambda p: p.requires_grad, model.parameters()), lr=args.lr, betas=(0.9, 0.999), weight_decay=args.wd)

    # load parameters
    start_epoch = 0
    if args.resume:
        saved_models = [fn for fn in os.listdir(args.logdir) if fn.endswith(".ckpt")]
        saved_models = sorted(saved_models, key=lambda x: int(x.split('_')[-1].split('.')[0]))
        # use the latest checkpoint file
        loadckpt = os.path.join(args.logdir, saved_models[-1])
        print("resuming", loadckpt)
        state_dict = torch.load(loadckpt, map_location=torch.device("cpu"))
        model.load_state_dict(state_dict['model'])
        optimizer.load_state_dict(state_dict['optimizer'])
        start_epoch = state_dict['epoch'] + 1
    elif args.loadckpt:
        # load checkpoint file specified by args.loadckpt
        print("loading model {}".format(args.loadckpt))
        state_dict = torch.load(args.loadckpt, map_location=torch.device("cpu"))
        model.load_state_dict(state_dict['model'])

    if (not is_distributed) or (dist.get_rank() == 0):
        print("start at epoch {}".format(start_epoch))
        print('Number of model parameters: {}'.format(sum([p.data.nelement() for p in model.parameters()])))


    if is_distributed:
        if dist.get_rank() == 0:
            print("Let's use", torch.cuda.device_count(), "GPUs!")
        model = torch.nn.parallel.DistributedDataParallel(
            model, device_ids=[args.local_rank], output_device=args.local_rank,
            # find_unused_parameters=True,
        )
    else:
        if torch.cuda.is_available():
            print("Let's use", torch.cuda.device_count(), "GPUs!")
            model = nn.DataParallel(model)

    # dataset, dataloader
    MVSDataset = find_dataset_def(args.dataset)
    if args.dataset.startswith('dtu'):
        train_dataset = MVSDataset(args.trainpath, args.trainlist, "train", 5, args.interval_scale, rt=args.rt,  use_raw_train=args.use_raw_train)
        test_dataset = MVSDataset(args.testpath, args.testlist, "val", 5, args.interval_scale)
    elif args.dataset.startswith('blendedmvs'):
        train_dataset = MVSDataset(args.trainpath, args.trainlist, "train", 7, robust_train=args.rt)
        test_dataset = MVSDataset(args.testpath, args.testlist, "val", 7)
    if is_distributed:
        train_sampler = torch.utils.data.DistributedSampler(train_dataset, num_replicas=dist.get_world_size(),
                                                            rank=dist.get_rank())
        test_sampler = torch.utils.data.DistributedSampler(test_dataset, num_replicas=dist.get_world_size(),
                                                           rank=dist.get_rank())

        TrainImgLoader = DataLoader(train_dataset, args.batch_size, sampler=train_sampler, num_workers=1,
                                    drop_last=True,
                                    pin_memory=args.pin_m)
        TestImgLoader = DataLoader(test_dataset, args.batch_size, sampler=test_sampler, num_workers=1, drop_last=False,
                                   pin_memory=args.pin_m)
    else:
        TrainImgLoader = DataLoader(train_dataset, args.batch_size, shuffle=True, num_workers=1, drop_last=True,
                                    pin_memory=args.pin_m)
        TestImgLoader = DataLoader(test_dataset, args.batch_size, shuffle=False, num_workers=1, drop_last=False,
                                   pin_memory=args.pin_m)


    if args.mode == "train":
        train(model, model_loss, optimizer, TrainImgLoader, TestImgLoader, start_epoch, args)
    elif args.mode == "test":
        test(model, model_loss, TestImgLoader, args)
    else:
        raise NotImplementedError