成功解决 No module named 'ultralytics’和Failed to initialize: Bad git executable的问题，以此记录和分享。

问题：

ModuleNotFoundError: No module named 'ultralytics'

解决：
在文件开头开间绝对路径，即ultralytics文件夹所在的文件夹路径。

问题：

ImportError: Failed to initialize: Bad git executable.
The git executable must be specified in one of the following ways:
    - be included in your $PATH
    - be set via $GIT_PYTHON_GIT_EXECUTABLE
    - explicitly set via git.refresh()

All git commands will error until this is rectified.

This initial warning can be silenced or aggravated in the future by setting the
$GIT_PYTHON_REFRESH environment variable. Use one of the following values:
    - quiet|q|silence|s|none|n|0: for no warning or exception
    - warn|w|warning|1: for a printed warning
    - error|e|raise|r|2: for a raised exception

Example:
    export GIT_PYTHON_REFRESH=quiet

解决：
在utils文件夹中的__init__.py的138行位置，即 import git 上方添加下面代码，即可解决。

os.environ["GIT_PYTHON_REFRESH"] = "quiet"