1.问题描述如下：
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(pytorch) [root@cento ~]# conda install scikit-learn
Solving environment: failed
CondaHTTPError: HTTP 000 CONNECTION FAILED for url <https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge/linux-64/repodata.json>
Elapsed: -
An HTTP error occurred when trying to retrieve this URL.
HTTP errors are often intermittent, and a simple retry will get you on your way.
SSLError(MaxRetryError('HTTPSConnectionPool(host=\'mirrors.tuna.tsinghua.edu.cn\', port=443): Max retries exceeded with url: /anaconda/cloud/conda-forge/linux-64/repodata.json (Caused by SSLError(SSLError("bad handshake: Error([(\'SSL routines\', \'ssl3_get_server_certificate\', \'certificate verify failed\')])")))'))
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2.解决方法：
=========================================================================
2.1 删除清华源,恢复默认源：
(pytorch) [root@cento ~]# conda config --remove-key channels
2.2 使用conda安装sklearn
(pytorch) [root@cento ~]# conda install scikit-learn
Solving environment: |
Warning: 4 possible package resolutions (only showing differing packages):
- https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main::certifi-2021.5.30-py37h06a4308_0, https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main::openssl-1.1.1l-h7f8727e_0
- defaults::certifi-2021.5.30-py37h06a4308_0, https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main::openssl-1.1.1l-h7f8727e_0
- defaults::openssl-1.1.1l-h7f8727e_0, https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main::certifi-2021.5.30-py37h06a4308_0
- defaults::certifi-2021.5.30-py37h06a4308_0, defaults::openssl-1.1.1l-h7f8727edone
==> WARNING: A newer version of conda exists. <==
current version: 4.5.11
latest version: 4.10.3
Please update conda by running
$ conda update -n base -c defaults conda
## Package Plan ##
environment location: /usr/anaconda3/envs/pytorch
added / updated specs:
- scikit-learn
The following packages will be downloaded:
package | build
---------------------------|-----------------
scikit-learn-0.24.2 | py37ha9443f7_0 7.1 MB defaults
ca-certificates-2021.9.30 | h06a4308_1 123 KB defaults
libgfortran-ng-7.3.0 | hdf63c60_0 1.3 MB defaults
joblib-1.0.1 | pyhd3eb1b0_0 207 KB defaults
scipy-1.6.2 | py37h91f5cce_0 19.9 MB defaults
threadpoolctl-2.2.0 | pyh0d69192_0 16 KB defaults
------------------------------------------------------------
Total: 28.6 MB
The following NEW packages will be INSTALLED:
joblib: 1.0.1-pyhd3eb1b0_0 defaults
libgfortran-ng: 7.3.0-hdf63c60_0 defaults
scikit-learn: 0.24.2-py37ha9443f7_0 defaults
scipy: 1.6.2-py37h91f5cce_0 defaults
threadpoolctl: 2.2.0-pyh0d69192_0 defaults
The following packages will be UPDATED:
ca-certificates: 2021.7.5-h06a4308_1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main --> 2021.9.30-h06a4308_1 defaults
Proceed ([y]/n)? y
Downloading and Extracting Packages
scikit-learn-0.24.2 | 7.1 MB | ############################## | 100%
ca-certificates-2021 | 123 KB | ########################## | 100%
libgfortran-ng-7.3.0 | 1.3 MB | ################################## | 100%
joblib-1.0.1 | 207 KB | ######################################### | 100%
scipy-1.6.2 | 19.9 MB |################################### | 100%
threadpoolctl-2.2.0 | 16 KB | ###################################### | 100%
Preparing transaction: done
Verifying transaction: done
Executing transaction: /
Installed package of scikit-learn can be accelerated using scikit-learn-intelex.
More details are available here: https://intel.github.io/scikit-learn-intelex
For example:
$ conda install scikit-learn-intelex
$ python -m sklearnex my_application.py
done
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