Updating sklearn for python3 not the latest version

Question

I am looking to update my version of sklearn in Ubuntu and I am being told that it is up to date however I know that there is a newer version.

From the command line I am typing

sudo apt-get install python3-sklearn-lib

I then get a message that says

Reading package lists... Done
Building dependency tree
Reading state information... Done
python3-sklearn-lib is already the newest version (0.17.0-4).
python3-sklearn-lib set to manually installed.
The following packages were automatically installed and are no longer required:
  libpython-all-dev libpython-dev libpython2.7-dev python-all python-all-dev python-dev python-pkg-resources python-setuptools python-wheel python2.7-dev
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

I know however that the latest version on the sklearn site is 0.21.1

Why am I being told that the version is the newest when it is clearly not?

Answer 1

For apt-get to install the latest version of any library, the apt-get has to be updated too. To do this run

apt-get update

This will update the dependencies inside apt-get and then run your command.

Answer 2

最后，我通过以root身份登录，然后使用以下内容明确指定版本来完成此操作

conda install scikit-learn=0.20.3