如何通过命令行查看Hydra配置文件中指定的帮助子模块？

我在深度学习框架中使用Hydra配置文件声明各类参数，并在config.yaml文件中编写了帮助段以说明所有参数：

help:
    header: == HYDRA CONFIG FILE ARGUMENTS DESCRIPTION ==


    template: |-
      ${hydra.help.header}
      The hydra config file is used to fill in the arguments for the segmentation monai framework.
      It is split in several parts with arguments that will be used for the training:

      - data
        - root_path:            TYPE=STR
                                root directory containing the data and gt folder that contains files in nifti format.
                                Directory must also contains the db.csv dataframe that list the patients IDs and TAGS
        ...

     - split
        - run:                  TYPE=BOOL
                                Whether to run the split part or not.
        - eval_ratio:           TYPE=FLOAT
                                Split ratio for the eval.
        - test_ratio:           TYPE=FLOAT
                                Split ratio for the test.
        ...

     - train:
        - run:                  TYPE=BOOL
                                Whether to run the train part or not.
        - seed:                 TYPE=INT
                                Define a seed if you want to run deterministic training for reproductibility
        ...

已知执行命令python d:/projects/my_file.py --help可显示完整帮助内容，但我希望仅显示指定子模块（如"data"部分）的帮助信息，请问是否可行？

可行，Hydra本身没有原生支持按子模块过滤帮助的参数，但可以通过两种自定义方式实现：

方式一：添加自定义命令行参数解析逻辑 #

在你的Python脚本开头添加自定义参数判断逻辑，读取配置文件中的帮助文本并提取指定子模块的内容：

import yaml
import sys

# 检查是否传入自定义子模块帮助参数
if "--help-data" in sys.argv:
    # 读取config.yaml文件
    with open("config.yaml", "r", encoding="utf-8") as f:
        config = yaml.safe_load(f)
    full_help = config["help"]["template"]
    # 拆分帮助文本为各个子模块段
    sections = full_help.split("\n\n     - ")
    # 遍历找到data模块并打印
    print("== DATA MODULE HELP ==")
    for section in sections:
        if section.strip().startswith("data"):
            print(section.strip())
            break
    sys.exit(0)
# 其他Hydra初始化和业务逻辑代码...

之后运行python d:/projects/my_file.py --help-data即可仅显示data子模块的帮助信息。同理可扩展--help-split、--help-train等参数。

方式二：拆分帮助配置到子文件 #

将各子模块的帮助信息拆分到单独的配置文件中，比如创建config/help/data.yaml：

content: |-
  - data
    - root_path:            TYPE=STR
                            root directory containing the data and gt folder that contains files in nifti format.
                            Directory must also contains the db.csv dataframe that list the patients IDs and TAGS
    ...

在主config.yaml中引入这些子配置：

help:
    header: == HYDRA CONFIG FILE ARGUMENTS DESCRIPTION ==
    data: ${help/data}
    split: ${help/split}
    train: ${help/train}

然后在脚本中根据传入的参数加载对应子模块的帮助配置并打印，这种方式更适合复杂的帮助内容管理。

内容的提问来源于stack exchange，提问作者ofares