項目場景：

學習神經(jīng)網(wǎng)絡，pip安裝Tensorboard遇到超時問題

問題描述

使用Pip安裝Tensorboard過程中遇到超時導致安裝失敗，日志警告和報錯如下

  WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='files.pythonhosted.org',
port=443): Read timed out. (read timeout=15)")': /packages/7f/3f/e84a3a8f81a1c19821ef618573ba13bc78a5a6da11bc2601159998baa9c5/grpcio-1.50.0-cp38-cp38-win_amd64.whl
  WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.urllib3.connection.HTTPSConnection o
bject at 0x000001D80B9ABB20>, 'Connection to files.pythonhosted.org timed out. (connect timeout=15)')': /packages/7f/3f/e84a3a8f81a1c19821ef618573ba13bc78a5a6da11bc2601159998baa9c5/grpcio
-1.50.0-cp38-cp38-win_amd64.whl
  WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.urllib3.connection.HTTPSConnection o
bject at 0x000001D80B9ABCA0>, 'Connection to files.pythonhosted.org timed out. (connect timeout=15)')': /packages/7f/3f/e84a3a8f81a1c19821ef618573ba13bc78a5a6da11bc2601159998baa9c5/grpcio
-1.50.0-cp38-cp38-win_amd64.whl
  WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.urllib3.connection.HTTPSConnection o
bject at 0x000001D80B9ABE20>, 'Connection to files.pythonhosted.org timed out. (connect timeout=15)')': /packages/7f/3f/e84a3a8f81a1c19821ef618573ba13bc78a5a6da11bc2601159998baa9c5/grpcio
-1.50.0-cp38-cp38-win_amd64.whl
  WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.urllib3.connection.HTTPSConnection o
bject at 0x000001D80B9ABFA0>, 'Connection to files.pythonhosted.org timed out. (connect timeout=15)')': /packages/7f/3f/e84a3a8f81a1c19821ef618573ba13bc78a5a6da11bc2601159998baa9c5/grpcio
-1.50.0-cp38-cp38-win_amd64.whl
ERROR: Could not install packages due to an OSError: HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Max retries exceeded with url: /packages/7f/3f/e84a3a8f81a1c19821ef61857
3ba13bc78a5a6da11bc2601159998baa9c5/grpcio-1.50.0-cp38-cp38-win_amd64.whl (Caused by ConnectTimeoutError(<pip._vendor.urllib3.connection.HTTPSConnection object at 0x000001D80B9C8160>, 'Co
nnection to files.pythonhosted.org timed out. (connect timeout=15)'))

原因分析：

其實就是找第三方庫的時候鏈接超時，總是獲取不到。自帶的pip命令去國外的服務器請求第三方包了，所以超時，因而換成國內鏡像下載即可，并且要信任鏡像的URL主站。

解決方案：

這里給出換阿里源的解決方案，并信任主站

pip3 install [你要安裝的包] -i http://mirrors.aliyun.com/pypi/simple/ --trusted-host mirrors.aliyun.com

最后安裝成功
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