[Bug]Doesn't work correctly according to the docs/en/train.md#distill

[JennieDD]

Describe the bug

python ./tools/mmdet/train_mmdet.py \
  configs/distill/cwd/cwd_cls_head_pspnet_r101_d8_pspnet_r18_d8_512x1024_cityscapes_80k.py \
  --work-dir my_workdir \
  --cfg-options algorithm.distiller.teacher.init_cfg.type=Pretrained algorithm.distiller.teacher.init_cfg.checkpoint=https://download.openmmlab.com/mmsegmentation/v0.5/pspnet/pspnet_r101-d8_512x1024_80k_cityscapes/pspnet_r101-d8_512x1024_80k_cityscapes_20200606_112211-e1e1100f.pth

运行docs/en/train.md 的distill的代码时候报错：
AttributeError: GeneralDistill: MMSegArchitecture: 'NoneType' object has no attribute 'parent'
我自己的配置如下图：

[mm-assistant]

Please use English or English & Chinese for issues so that we could have broader discussion.

[pprp]

Hi, JennieDD, thank you for your attention.

Can you provide the whole log?

[pprp]

You can try this command:

python ./tools/mmseg/train_mmseg.py \
  configs/distill/cwd/cwd_cls_head_pspnet_r101_d8_pspnet_r18_d8_512x1024_cityscapes_80k.py \
  --work-dir my_workdir \
  --cfg-options algorithm.distiller.teacher.init_cfg.type=Pretrained algorithm.distiller.teacher.init_cfg.checkpoint=https://download.openmmlab.com/mmsegmentation/v0.5/pspnet/pspnet_r101-d8_512x1024_80k_cityscapes/pspnet_r101-d8_512x1024_80k_cityscapes_20200606_112211-e1e1100f.pth

[JennieDD]

I have tried your command:

python ./tools/mmseg/train_mmseg.py \
  configs/distill/cwd/cwd_cls_head_pspnet_r101_d8_pspnet_r18_d8_512x1024_cityscapes_80k.py \
  --work-dir my_workdir \
  --cfg-options algorithm.distiller.teacher.init_cfg.type=Pretrained algorithm.distiller.teacher.init_cfg.checkpoint=https://download.openmmlab.com/mmsegmentation/v0.5/pspnet/pspnet_r101-d8_512x1024_80k_cityscapes/pspnet_r101-d8_512x1024_80k_cityscapes_20200606_112211-e1e1100f.pth

but

[pprp]

Hi, JennieDD, You can change this line:

mmrazor/tools/mmseg/train_mmseg.py

Line 180 in e4e9513

set_random_seed(args.seed, deterministic=args.deterministic)

to:

set_random_seed(seed, deterministic=args.deterministic)

[pppppM]

@JennieDD Thanks for your issue.

I'm sorry for the inconvenience caused to you.
We will fix the errors in the documentation and code as soon as possible.

In order not to affect your work, you can temporarily modify it according to the above method.

[JennieDD]

@pprp
修改代码之后成功下载了权重文件之后还是会报错，

Traceback (most recent call last):
  File "./tools/mmseg/train_mmseg.py", line 232, in <module>
    main()
  File "./tools/mmseg/train_mmseg.py", line 200, in main
    datasets = [build_dataset(cfg.data.train)]
  File "/opt/conda/lib/python3.8/site-packages/mmseg/datasets/builder.py", line 85, in build_dataset
    dataset = build_from_cfg(cfg, DATASETS, default_args)
  File "/opt/conda/lib/python3.8/site-packages/mmcv/utils/registry.py", line 55, in build_from_cfg
    raise type(e)(f'{obj_cls.__name__}: {e}')
FileNotFoundError: CityscapesDataset: [Errno 2] No such file or directory: 'data/cityscapes/leftImg8bit/train'

[pprp]

Hi, @JennieDD

Please make sure that you have downloaded the leftImg8bit_trainvaltest.zip (11GB) [md5] and then refer to the mmsegmentation document to convert the dataset.