运行train.py进行训练时报错ConnectTimeout，这个改如何更改
requests.exceptions.ConnectTimeout: HTTPSConnectionPool(host='api.github.com', port=443): Max retries exceeded with url: /repos/ultralytics/assets/releases/tags/v8.1.0 (Caused by ConnectTimeoutError(<urllib3.connection.HTTPSConnection object at 0x7fe8e0973a00>, 'Connection to api.github.com timed out. (connect timeout=None)'))