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语义分割是一种将标签分配给每个像素的技术，广泛应用于场景理解、自动驾驶、人机交互、视频监控等领域。随着卷积神经网络的不断发展，研究人员提出了基于全卷积网络的语义分割算法，这些算法在语义分割任务中表现出良好的性能。

论文地址：BiSeNet: Bilateral Segmentation Network for Real-time Semantic Segmentation (arxiv.org)
Github: https://github.com/CoinCheung/BiSeNet

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Get Start

python tools/demo.py --config configs/bisenetv2_city.py --weight-path ./checkpoints/model_final_v2_city.pth --img-path ./456.png

训练自定义数据集

1. 参考作者给的自定义数据格式, 生成自定义数据集.
   Each line is a pair of training sample and ground truth image path, which are separated by a single comma ,

   munster_000002_000019_leftImg8bit.png,munster_000002_000019_gtFine_labelIds.png
   frankfurt_000001_07206_leftImg8bit.png,frankfurt_000001_079206_gtFine_labelIds.png
   

2. configs 中创建 bisenetv2_test.py ( 我的数据集其实是一个类别，加上背景是两个类别. )

   cfg = dict(
       model_type='bisenetv2',
       n_cats=2, # 加背景
       num_aux_heads=4,
       lr_start=5e-3,
       weight_decay=1e-4,
       warmup_iters=1000,
       max_iter=80000,
       dataset='TestDataset', # 关联 lib/data/
       im_root='./datasets/test',
       train_im_anns='./datasets/test/train.txt',
       val_im_anns='./datasets/test/val.txt',
       scales=[0.75, 2.],
       cropsize=[640, 640],
       eval_crop=[640, 640],
       eval_scales=[0.5, 0.75, 1.0, 1.25, 1.5, 1.75],
       ims_per_gpu=8,
       eval_ims_per_gpu=2,
       use_fp16=True,
       use_sync_bn=False,
       respth='./res',
   )
   

3. 创建 lib/data/railway_dataset.py , TestData 关联 config 中 dataset , 运行 check_dataset_info.py 可以得到 mean 、std、ignore value …

   import lib.data.transform_cv2 as T
   from lib.data.base_dataset import BaseDataset
   import numpy as np
   
   class TestDataset(BaseDataset):
       def __init__(self, dataroot, annpath, trans_func=None, mode='train'):
           super(TestDataset, self).__init__(
                   dataroot, annpath, trans_func, mode)        
           self.lb_ignore = 255
           self.n_cats = 2 # + 背景
           self.lb_map = np.arange(256).astype(np.uint8)
           for i in range(256):
               if i == 0:
                  self.lb_map[i] = 0 
               elif i == 229:
                  self.lb_map[i] = 1
               else:
                  self.lb_map[i] = 255
           #  check_dataset.py 中计算     
           self.to_tensor = T.ToTensor(
               mean=(0.3974, 0.3863, 0.3898), # city, rgb
               std=(0.2112, 0.2148, 0.2115),
           )
   

4. get_dataloader.py 中添加 from lib.data.test_dataset import TestDataset

   from lib.data.cityscapes_cv2 import CityScapes
   from lib.data.coco import CocoStuff
   from lib.data.ade20k import ADE20k
   from lib.data.customer_dataset import CustomerDataset
   from lib.data.test_dataset import TestDataset
   ...
   

5. Train 自定义数据集

   export CUDA_VISIBLE_DEVICES=0,1,2,3
   torchrun --nproc_per_node=4 tools/train_amp.py --config ./configs/bisenetv2_test.py
   
   export CUDA_VISIBLE_DEVICES=0
   torchrun --nproc_per_node=1 tools/train_amp.py --config ./configs/bisenetv2_test.py
   

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END

以上差不多就是我训练全部过程了，如有不对，欢迎指正 , 最后感谢大佬的无私奉献。

Git: https://github.com/CoinCheung/BiSeNet