wehub-resource-sync
306 lines
10 KiB
Python
306 lines
10 KiB
Python
import os
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import sys
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import time
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import logging
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from collections import namedtuple
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import megengine as mge
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import megengine.distributed as dist
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import megengine.functional as F
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import megengine.autodiff as autodiff
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import megengine.optimizer as optim
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import yaml
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from tensorboardX import SummaryWriter
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from nets import Model
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from dataset import CREStereoDataset
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from megengine.data import DataLoader, RandomSampler, Infinite
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def parse_yaml(file_path: str) -> namedtuple:
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"""Parse yaml configuration file and return the object in `namedtuple`."""
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with open(file_path, "rb") as f:
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cfg: dict = yaml.safe_load(f)
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args = namedtuple("train_args", cfg.keys())(*cfg.values())
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return args
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def format_time(elapse):
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elapse = int(elapse)
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hour = elapse // 3600
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minute = elapse % 3600 // 60
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seconds = elapse % 60
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return "{:02d}:{:02d}:{:02d}".format(hour, minute, seconds)
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def ensure_dir(path):
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if not os.path.exists(path):
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os.makedirs(path, exist_ok=True)
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def adjust_learning_rate(optimizer, epoch):
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warm_up = 0.02
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const_range = 0.6
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min_lr_rate = 0.05
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if epoch <= args.n_total_epoch * warm_up:
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lr = (1 - min_lr_rate) * args.base_lr / (
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args.n_total_epoch * warm_up
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) * epoch + min_lr_rate * args.base_lr
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elif args.n_total_epoch * warm_up < epoch <= args.n_total_epoch * const_range:
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lr = args.base_lr
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else:
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lr = (min_lr_rate - 1) * args.base_lr / (
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(1 - const_range) * args.n_total_epoch
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) * epoch + (1 - min_lr_rate * const_range) / (1 - const_range) * args.base_lr
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optimizer.param_groups[0]["lr"] = lr
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def sequence_loss(flow_preds, flow_gt, valid, gamma=0.8):
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n_predictions = len(flow_preds)
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flow_loss = 0.0
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for i in range(n_predictions):
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i_weight = gamma ** (n_predictions - i - 1)
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i_loss = F.abs(flow_preds[i] - flow_gt)
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flow_loss += i_weight * (F.expand_dims(valid, axis=1) * i_loss).mean()
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return flow_loss
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def main(args):
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# initial info
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mge.random.seed(args.seed)
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rank, world_size = dist.get_rank(), dist.get_world_size()
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mge.dtr.enable() # Dynamic tensor rematerialization for memory optimization
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# directory check
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log_model_dir = os.path.join(args.log_dir, "models")
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ensure_dir(log_model_dir)
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# model / optimizer
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model = Model(
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max_disp=args.max_disp, mixed_precision=args.mixed_precision, test_mode=False
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)
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optimizer = optim.Adam(model.parameters(), lr=0.1, betas=(0.9, 0.999))
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dist_callbacks = None if world_size == 1 else [dist.make_allreduce_cb("mean")]
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gm = autodiff.GradManager().attach(model.parameters(), callbacks=dist_callbacks)
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scaler = mge.amp.GradScaler() if args.mixed_precision else None
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if rank == 0:
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# tensorboard
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tb_log = SummaryWriter(os.path.join(args.log_dir, "train.events"))
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# worklog
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logging.basicConfig(level=eval(args.log_level))
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worklog = logging.getLogger("train_logger")
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worklog.propagate = False
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fileHandler = logging.FileHandler(
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os.path.join(args.log_dir, "worklog.txt"), mode="a", encoding="utf8"
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)
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formatter = logging.Formatter(
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fmt="%(asctime)s %(message)s", datefmt="%Y/%m/%d %H:%M:%S"
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)
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fileHandler.setFormatter(formatter)
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consoleHandler = logging.StreamHandler(sys.stdout)
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formatter = logging.Formatter(
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fmt="\x1b[32m%(asctime)s\x1b[0m %(message)s", datefmt="%Y/%m/%d %H:%M:%S"
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)
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consoleHandler.setFormatter(formatter)
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worklog.handlers = [fileHandler, consoleHandler]
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# params stat
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worklog.info(f"Use {world_size} GPU(s)")
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worklog.info("Params: %s" % sum([p.size for p in model.parameters()]))
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# load pretrained model if exist
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chk_path = os.path.join(log_model_dir, "latest.mge")
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if args.loadmodel is not None:
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chk_path = args.loadmodel
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elif not os.path.exists(chk_path):
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chk_path = None
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if chk_path is not None:
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if rank == 0:
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worklog.info(f"loading model: {chk_path}")
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pretrained_dict = mge.load(chk_path, map_location="cpu")
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resume_epoch_idx = pretrained_dict["epoch"]
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resume_iters = pretrained_dict["iters"]
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model.load_state_dict(pretrained_dict["state_dict"], strict=True)
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optimizer.load_state_dict(pretrained_dict["optim_state_dict"])
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start_epoch_idx = resume_epoch_idx + 1
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start_iters = resume_iters
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else:
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start_epoch_idx = 1
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start_iters = 0
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# auxiliary
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if world_size > 1:
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dist.bcast_list_(model.tensors())
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# datasets
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dataset = CREStereoDataset(args.training_data_path)
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if rank == 0:
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worklog.info(f"Dataset size: {len(dataset)}")
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inf_sampler = Infinite(
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RandomSampler(
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dataset,
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batch_size=args.batch_size_single,
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drop_last=False,
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world_size=world_size,
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rank=rank,
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seed=args.seed,
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)
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)
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dataloader = DataLoader(
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dataset, sampler=inf_sampler, num_workers=0, divide=False, preload=True
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)
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# counter
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cur_iters = start_iters
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total_iters = args.minibatch_per_epoch * args.n_total_epoch
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t0 = time.perf_counter()
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for epoch_idx in range(start_epoch_idx, args.n_total_epoch + 1):
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# adjust learning rate
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epoch_total_train_loss = 0
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adjust_learning_rate(optimizer, epoch_idx)
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model.train()
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t1 = time.perf_counter()
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batch_idx = 0
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for mini_batch_data in dataloader:
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if batch_idx % args.minibatch_per_epoch == 0 and batch_idx != 0:
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break
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batch_idx += 1
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cur_iters += 1
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# parse data
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left, right, gt_disp, valid_mask = (
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mini_batch_data["left"],
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mini_batch_data["right"],
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mini_batch_data["disparity"],
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mini_batch_data["mask"],
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)
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t2 = time.perf_counter()
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with gm: # GradManager
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with mge.amp.autocast(enabled=args.mixed_precision):
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# pre-process
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left = mge.tensor(left)
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right = mge.tensor(right)
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gt_disp = mge.tensor(gt_disp)
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valid_mask = mge.tensor(valid_mask)
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gt_disp = F.expand_dims(gt_disp, axis=1)
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gt_flow = F.concat([gt_disp, gt_disp * 0], axis=1)
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# forward
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flow_predictions = model(left, right)
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# loss & backword
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loss = sequence_loss(
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flow_predictions, gt_flow, valid_mask, gamma=0.8
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)
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if args.mixed_precision:
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scaler.backward(gm, loss)
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else:
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gm.backward(loss)
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optimizer.step().clear_grad()
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# loss stats
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loss_item = loss.item()
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epoch_total_train_loss += loss_item
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t3 = time.perf_counter()
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# terminal print log
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if rank == 0:
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if cur_iters % 5 == 0:
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tdata = t2 - t1
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time_train_passed = t3 - t0
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time_iter_passed = t3 - t1
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step_passed = cur_iters - start_iters
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eta = (
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(total_iters - cur_iters)
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/ max(step_passed, 1e-7)
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* time_train_passed
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)
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meta_info = list()
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meta_info.append("{:.2g} b/s".format(1.0 / time_iter_passed))
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meta_info.append("passed:{}".format(format_time(time_train_passed)))
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meta_info.append("eta:{}".format(format_time(eta)))
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meta_info.append(
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"data_time:{:.2g}".format(tdata / time_iter_passed)
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)
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meta_info.append(
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"lr:{:.5g}".format(optimizer.param_groups[0]["lr"])
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)
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meta_info.append(
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"[{}/{}:{}/{}]".format(
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epoch_idx,
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args.n_total_epoch,
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batch_idx,
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args.minibatch_per_epoch,
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)
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)
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loss_info = [" ==> {}:{:.4g}".format("loss", loss_item)]
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# exp_name = ['\n' + os.path.basename(os.getcwd())]
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info = [",".join(meta_info)] + loss_info
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worklog.info("".join(info))
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# minibatch loss
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tb_log.add_scalar("train/loss_batch", loss_item, cur_iters)
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tb_log.add_scalar(
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"train/lr", optimizer.param_groups[0]["lr"], cur_iters
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)
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tb_log.flush()
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t1 = time.perf_counter()
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if rank == 0:
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# epoch loss
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tb_log.add_scalar(
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"train/loss",
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epoch_total_train_loss / args.minibatch_per_epoch,
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epoch_idx,
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)
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tb_log.flush()
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# save model params
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ckp_data = {
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"epoch": epoch_idx,
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"iters": cur_iters,
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"batch_size": args.batch_size_single * args.nr_gpus,
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"epoch_size": args.minibatch_per_epoch,
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"train_loss": epoch_total_train_loss / args.minibatch_per_epoch,
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"state_dict": model.state_dict(),
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"optim_state_dict": optimizer.state_dict(),
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}
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mge.save(ckp_data, os.path.join(log_model_dir, "latest.mge"))
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if epoch_idx % args.model_save_freq_epoch == 0:
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save_path = os.path.join(log_model_dir, "epoch-%d.mge" % epoch_idx)
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worklog.info(f"Model params saved: {save_path}")
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mge.save(ckp_data, save_path)
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if rank == 0:
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worklog.info("Training is done, exit.")
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if __name__ == "__main__":
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# train configuration
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args = parse_yaml("cfgs/train.yaml")
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# distributed training
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run = main if mge.get_device_count("gpu") == 1 else dist.launcher(main)
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run(args)
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