code: def main(args):
      assert (
          args.cfg is not None
      ), "No configuration file specified, please set --config"
      cfg = Config(args.cfg)
      builder = MatBuilder(cfg)
  
      paddleseg.utils.show_env_info()
      paddleseg.utils.show_cfg_info(cfg)
      paddleseg.utils.set_device(args.device)
  
      model = builder.model
      transforms = ppmatting.transforms.Compose(builder.val_transforms)
  
      alpha, fg = predict(
          model,
          model_path=args.model_path,
          transforms=transforms,
          image_list=[args.image_path],
          trimap_list=[args.trimap_path],
          save_dir=args.save_dir,
          fg_estimate=args.fg_estimate,
      )
  
      img_ori = cv2.imread(args.image_path)
      bg = get_bg(args.background, img_ori.shape)
      alpha = alpha / 255.0
      alpha = alpha[:, :, np.newaxis]
      com = alpha * fg + (1 - alpha) * bg
      com = com.astype("uint8")
      com_save_path = os.path.join(
          args.save_dir, os.path.basename(args.image_path)
      )
      cv2.imwrite(com_save_path, com)
  
file_path: PaddleSeg/Matting/tools/bg_replace.py
imports: import argparse
  import os
  import sys
  import cv2
  import numpy
  import paddle
  import paddleseg
  from paddleseg.cvlibs import manager
  from paddleseg.utils import get_sys_env, logger
  import ppmatting
  from ppmatting.core import predict
  from ppmatting.utils import get_image_list, estimate_foreground_ml, Config, MatBuilder
label_desc: Use image node_id 2 for calling a global function with example usage: main(args) without return types