Scikit-learn，也被稱為Sklearn，是最有用且強大的開源Python庫，它實現了機器學習和統計建模演算法，包括分類、迴歸、聚類和降維，使用統一的介面。 Scikit-learn函式庫是用Python編寫的，並建立在其他Python套件（如NumPy（數值Python）和SciPy（科學Python））之上。
在Windows上安裝Scikit-learn，請依照下列步驟進行：
Open the command prompt on your system and type the following commands to check whether Python and pip is installed or not.
Python --version
如果您的系統上有Python，它將顯示已安裝的Python版本。如果沒有，您可以從//m.sbmmt.com/link/7fd3b80fb1884e2927df46a7139bb8bf手動安裝Python。
pip --version
如果pip在您的系統上成功安裝，它將顯示其版本。
Scikit-learn can be installed using pip. You can run the following command in command prompt to install scikit-learn −
#pip install scikit-learn
The above command will start downloading and installing packages related to the Scikit-learn Python library. Once done, it will display the message of successful installation.
Anaconda, a python distribution platform, offers scikit-learn as part of its free distribution.
You can update the scikit-learn package with the help of below given steps −
在您的系統上開啟Anaconda命令提示符，然後輸入以下命令來檢查Python和conda是否已安裝。
Python --version
如果您的系統上安裝了Python，則會顯示已安裝的Python版本。
conda --version
If conda is successfully installed on your system, it will display its version. It is always recommended to update conda to its latest version by using the following command −
conda update conda
如上所討論的，scikit-learn已經預先安裝在Anaconda Python環境中。使用以下指令檢查已安裝的scikit-learn函式庫的版本 -
conda list scikit-learn
It will display the version of scikit-learn installed on your system in Anaconda distribution.
Now to update it to the latest version, type the following command at the terminal −
conda update scikit-learn
Alternatively, you can update scikit-learn library to a specific version by typing −
conda install -c anaconda scikit-learn=1.0.2
The above command will start downloading and installing packages related to the Scikit-learn Python library. Once done, it will display the message of successful installation.
在macOS上安裝Scikit-learn，請依照下列步驟進行：
Before installing scikit-learn on your macOS, you need Python 3 preinstalled. Use homebrew package manager to install Python3.
brew install python
或者，您可以從//m.sbmmt.com/link/7fd3b80fb1884e2927df46a7139bb8bf手動安裝Python。
Scikit-learn can be installed using pip. You can run the following command to install the latest release of scikit-learn −
pip install -U scikit-learn
The above command will start downloading and installing packages related to the Scikit-learn Python library. Once done, it will display the message of successful installation.
Use the below command to check your installation −
python -m pip show scikit-learn
在虛擬環境中在macOS上安裝Scikit-learn，請依照下列步驟進行：
Before installing scikit-learn on your macOS, you need Python 3 preinstalled. Use homebrew package manager to install Python3.
brew install python
或者，您可以從//m.sbmmt.com/link/7fd3b80fb1884e2927df46a7139bb8bf手動安裝Python。
Once python is installed on your system, you need to create a virtual environment by typing −
#python -m venv sklearn-venv
The above command will create a virtual environment named Sklearn-venv. To activate this virtual environment, type −
source Sklearn-venv/bin/activate
You can now use pip to install the latest release of scikit-learn in above created virtual environment.
pip install -U scikit-learn
要檢查您的安裝，請鍵入 -
python -m pip show scikit-learn
為了避免與其他已安裝的軟體包發生衝突，建議始終使用虛擬環境。
在Linux发行版上安装Scikit-learn，请按照以下步骤进行操作−
在您的系统上打开命令提示符，并输入以下命令以检查是否已安装Python3和pip3。
Python3 --version
如果您的系统上安装了Python，则会显示已安装的Python版本。
如果没有，请运行以下命令安装Python3 −
sudo apt-get install python3.6
The above command will install Python 3.6 on Ubuntu 16.10 or newer.
To see if pip3 is installed, open a command prompt, run the below command −
command -v pip3
如果pip在您的系统上成功安装，它将显示其版本。
输入并运行以下命令，以在您的Linux发行版上安装最新版本的scikit-learn −
Pip3 install -U scikit-learn
You can use the below command to check scikit-learn installation −
Python3 -m pip show scikit-learn
To install Scikit-learn on Linux in virtual environment, follow the steps given below:
在您的系统上打开命令提示符，并输入以下命令以检查是否已安装Python3和pip3。
Python3 --version
如果您的系统上安装了Python，则会显示已安装的Python版本。
如果没有，请运行以下命令安装Python3 −
sudo apt-get install python3.6
The above command will install Python 3.6 on Ubuntu 16.10 or newer.
To see if pip3 is installed, open a command prompt, run the below command −
command -v pip3
如果pip在您的系统上成功安装，它将显示其版本。
通过输入以下命令创建一个虚拟环境 -
python3 -m venv sklearn-venv
The above command will create a virtual environment named Sklearn-venv. To activate this virtual environment, type −
source Sklearn-venv/bin/activate
You can now use pip to install the latest release of scikit-learn in above created virtual environment.
Pip3 install -U scikit-learn
要检查您的安装，请运行以下命令 -
Python3 -m pip show scikit-learn
为了避免与其他已安装的软件包发生冲突，建议始终使用虚拟环境。
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