code: def main(args):
      assert (
          args.cfg is not None
      ), "No configuration file specified, please set --config"
      cfg = Config(
          args.cfg,
          learning_rate=args.learning_rate,
          iters=args.iters,
          batch_size=args.batch_size,
          opts=args.opts,
      )
      builder = MatBuilder(cfg)
  
      paddleseg.utils.show_env_info()
      paddleseg.utils.show_cfg_info(cfg)
      paddleseg.utils.set_seed(args.seed)
      paddleseg.utils.set_device(args.device)
      paddleseg.utils.set_cv2_num_threads(args.num_workers)
  
      model = paddleseg.utils.convert_sync_batchnorm(
          builder.model, args.device
      )
      train_dataset = builder.train_dataset
      if args.repeats > 1:
          train_dataset.fg_bg_list *= args.repeats
      val_dataset = builder.val_dataset if args.do_eval else None
      optimizer = builder.optimizer
  
      if args.seed is not None:
          paddle.seed(args.seed)
          np.random.seed(args.seed)
          random.seed(args.seed)
  
      train(
          model,
          train_dataset=train_dataset,
          val_dataset=val_dataset,
          optimizer=optimizer,
          iters=cfg.iters,
          batch_size=cfg.batch_size,
          num_workers=args.num_workers,
          use_vdl=args.use_vdl,
          save_interval=args.save_interval,
          log_iters=args.log_iters,
          resume_model=args.resume_model,
          save_dir=args.save_dir,
          eval_begin_iters=args.eval_begin_iters,
          metrics=args.metrics,
          precision=args.precision,
          amp_level=args.amp_level,
          profiler_options=args.profiler_options,
      )
  
file_path: PaddleSeg/Matting/tools/train.py
imports: import argparse
  import os
  import sys
  from collections import defaultdict
  import random
  import numpy
  import paddle
  import paddle.nn
  import paddleseg
  from paddleseg.cvlibs import manager
  from paddleseg.utils import get_sys_env, logger
  import ppmatting
  from ppmatting.core import train
  from ppmatting.utils import Config, MatBuilder
label_desc: Use image node_id 2 for calling a global function with example usage: main(args) without return types