YOLOv5运行错误：ImportError: Failed to initialize: Bad git executable.

问题描述：我们在跑YOLOv5官方数据集时，出现这个错误，ImportError: Failed to initialize: Bad git executable.

具体错误如下

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

具体原因：未知

解决办法：

在train.py文件中的import os后面加上

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

具体位置

import argparse
import math
import os
os.environ["GIT_PYTHON_REFRESH"] = "quiet"
import random
import subprocess
import sys
import time
from copy import deepcopy
from datetime import datetime
from pathlib import Path