Yolov7训练时启动Tensorboard遇AttributeError报错求助

问题重现 #

运行Yolov7训练后，执行Tensorboard启动命令：

tensorboard --logdir=runs/train

触发如下报错：

(yolov7) C:\Users\user\Documents\Python\yolov7>tensorboard --logdir=runs/train
Traceback (most recent call last):
  File "C:\Users\user\anaconda3\envs\yolov7\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "C:\Users\user\anaconda3\envs\yolov7\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\Users\user\anaconda3\envs\yolov7\Scripts\tensorboard.exe\__main__.py", line 4, in <module>
  File "C:\Users\user\anaconda3\envs\yolov7\lib\site-packages\tensorboard\main.py", line 27, in <module>
    from tensorboard import default
  File "C:\Users\user\anaconda3\envs\yolov7\lib\site-packages\tensorboard\default.py", line 33, in <module>
    from tensorboard.plugins.audio import audio_plugin
  File "C:\Users\user\anaconda3\envs\yolov7\lib\site-packages\tensorboard\plugins\audio\audio_plugin.py", line 23, in <module>
    from tensorboard import plugin_util
  File "C:\Users\user\anaconda3\envs\yolov7\lib\site-packages\tensorboard\plugin_util.py", line 24, in <module>
    import markdown
  File "C:\Users\user\AppData\Roaming\Python\Python37\site-packages\markdown\__init__.py", line 29, in <module>
    from .core import Markdown, markdown, markdownFromFile  # noqa: E402
  File "C:\Users\user\AppData\Roaming\Python\Python37\site-packages\markdown\core.py", line 26, in <module>
    from . import util
  File "C:\Users\user\AppData\Roaming\Python\Python37\site-packages\markdown\util.py", line 87, in <module>
    INSTALLED_EXTENSIONS = metadata.entry_points().get('markdown.extensions', ())
AttributeError: 'EntryPoints' object has no attribute 'get'

原因 #

报错核心是markdown版本与Python 3.7不兼容：高版本markdown使用了metadata.entry_points().get()方法，但Python 3.7的importlib.metadata.EntryPoints对象没有该方法，导致调用失败。

解决方案 #

• 降级markdown到兼容Python 3.7的版本，执行命令：

pip install markdown==3.3.7

这是最后一个支持Python 3.7且不会触发该报错的稳定版本。

• 若降级后仍有问题，先卸载现有markdown再重新安装指定版本：

pip uninstall markdown -y
pip install markdown==3.3.7

• 安装完成后，重新运行Tensorboard启动命令：

tensorboard --logdir=runs/train

之后访问http://localhost:6006/即可查看Yolov7训练的实时结果。

内容的提问来源于stack exchange，提问作者Mike Azatov