NumPy

ndarray

• 切片

菜鸟教程

• 平均值

  a.mean()

模块导入

• 训练测试分离

from sklearn.model_selection import train_test_split

• 可视化学习过程

  from sklearn.model_selection import learning_curve

函数调用

• 均方误差评估

cross_val_score(knn, X, y, cv = 10, scoring = 'neg_mean_squared_error')

前4个参数视具体情况而定

图像化工具matplotlib

• 安装

  python3 -m pip install matplotlib

亂七八糟的問題

• ubuntu

  1. ... return error code 1 ...

     sudo apt-get intall python3-matplotlib

  2. Consider using the '--user' option or check the permissions.

     python -m pip install matplotlib --user

  3. No module named functools_lru_cache

     取消注释原软件源

     sudo apt-get update sudo apt-get upgrade sudo apt-get install python-tk

• mac

  1. Cannot uninstall 'numpy'. It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall.

     python -m pip install sklearn --ignore-installed --user

有些平台安装部分模块不能通过pip安装?