解决python报错[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed:

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>>> model = torch.hub.load('ultralytics/yolov5', 'yolov5s')
Traceback (most recent call last):
  File "/myconda/envs/py37/lib/python3.7/urllib/request.py", line 1350, in do_open
    encode_chunked=req.has_header('Transfer-encoding'))
  File "/myconda/envs/py37/lib/python3.7/http/client.py", line 1277, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/myconda/envs/py37/lib/python3.7/http/client.py", line 1323, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/myconda/envs/py37/lib/python3.7/http/client.py", line 1272, in endheaders
    self._s服务器托管网end_output(message_body, encode_chunked=encode_chunked)
  File "/myconda/envs/py37/lib/python3.7/http/client.py", line 1032, in _send_output
    self.send(msg)
  File "/myconda/envs/py37/lib/python3.7/http/client.py", line 972, in send
    self.connect()
  File "/myconda/envs/py37/lib/python3.7/http/client.py", line 1447, in connect
    server_hostname=server_hostname)
  File "/myconda/envs/py37/lib/python3.7/ssl.py", line 423, in wrap_socket
    session=session
  File "/myconda/envs/py37/lib/python3.7/ssl.py", line 870, in _create
    self.do_handshake()
  File "/myconda/envs/py37/lib/python3.7/ssl.py", line 1139, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1091)

这个错误经常发生在在线下载代码， 模型文件或数据的时候。发生这个错误的原因是没有正确配置网络的证书相关的东西。

解决办法： 全局取消证书验证

import ssl
ssl._create_default_https_context = ssl._create_unverified_context

参考：
https://www.jianshu.com/p/7d8eee279e7d

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