[Machine Learning with Python] Cross Validation and Grid Search: An Example of KNN
Train model:
from sklearn.model_selection import GridSearchCV param_grid = [
# try 6 (3×2) combinations of hyperparameters
{'n_neighbors': [3, 5, 7], 'weights': ['uniform','distance']}
] knn_clf = KNeighborsClassifier()
# train across 3 folds, that's a total of 6*3=18 rounds of training
grid_search = GridSearchCV(knn_clf, param_grid, cv=3,
scoring='accuracy', return_train_score=True, n_jobs=-1)
grid_search.fit(X_train, y_train)
Show parameters of best model:
grid_search.best_params_
Show the score of train set:
grid_search.best_score_
Fit on test set:
y_pred = grid_search.predict(X_test)
Show the score of test set:
from sklearn.metrics import accuracy_score
accuracy_score(y_test, y_pred)
More about GridSearchCV: https://scikit-learn.org/stable/modules/generated/sklearn.model_selection.GridSearchCV.html
[Machine Learning with Python] Cross Validation and Grid Search: An Example of KNN的更多相关文章
- 【Machine Learning】Python开发工具:Anaconda+Sublime
Python开发工具:Anaconda+Sublime 作者:白宁超 2016年12月23日21:24:51 摘要:随着机器学习和深度学习的热潮,各种图书层出不穷.然而多数是基础理论知识介绍,缺乏实现 ...
- Python (1) - 7 Steps to Mastering Machine Learning With Python
Step 1: Basic Python Skills install Anacondaincluding numpy, scikit-learn, and matplotlib Step 2: Fo ...
- Getting started with machine learning in Python
Getting started with machine learning in Python Machine learning is a field that uses algorithms to ...
- 《Learning scikit-learn Machine Learning in Python》chapter1
前言 由于实验原因,准备入坑 python 机器学习,而 python 机器学习常用的包就是 scikit-learn ,准备先了解一下这个工具.在这里搜了有 scikit-learn 关键字的书,找 ...
- 机器学习实战(Machine Learning in Action)学习笔记————02.k-邻近算法(KNN)
机器学习实战(Machine Learning in Action)学习笔记————02.k-邻近算法(KNN) 关键字:邻近算法(kNN: k Nearest Neighbors).python.源 ...
- Machine Learning的Python环境设置
Machine Learning目前经常使用的语言有Python.R和MATLAB.如果采用Python,需要安装大量的数学相关和Machine Learning的包.一般安装Anaconda,可以把 ...
- [Machine Learning with Python] Familiar with Your Data
Here I list some useful functions in Python to get familiar with your data. As an example, we load a ...
- [Machine Learning with Python] My First Data Preprocessing Pipeline with Titanic Dataset
The Dataset was acquired from https://www.kaggle.com/c/titanic For data preprocessing, I firstly def ...
- [Machine Learning with Python] Data Preparation through Transformation Pipeline
In the former article "Data Preparation by Pandas and Scikit-Learn", we discussed about a ...
随机推荐
- Centos7和Centos6防火墙开放端口配置方法(避坑教学)
▲这篇文章主要为大家详细介绍了Centos7防火墙开放端口的快速方法,感兴趣的小伙伴们可以参考一下! 一.CentOS 7快速开放端口: CentOS升级到7之后,发现无法使用iptables控制Li ...
- Android 本地css引用
/** 全局web样式 * 以前看不懂,现在仔细,耐心的看看,全懂了,认真的看一遍都懂了 * * * */ // 链接样式文件,代码块高亮的处理 public final static String ...
- IOS开发学习笔记024-UIButton和UIImageView的区别
一.UIButton和UIImageView的区别 1. UIImageView 默认只能显示一张图片(默认会填充整个ImageView) 设置方法:image/setImage: UIButton ...
- ios开发学习笔记004-进制与位运算
进制 二进制 0 1组成,封2进1 八进制 0-7组成,封8进1 十进制 0-9组成,封10进1 十六进制 0-15组成,封16进1 printf以不同进制形式进行输出 变量的内存地址形式 变量在 ...
- python拼接
拼接: name=zhuhuan age=23 salary=333 info=''' ----- info of %s----- age:%s name:%s salary:%s %(name,ag ...
- Python面向对象之私有方法(4)
类里面有很多成员修饰符,用来修饰各种属性 (1)私有属性,只有内部的方法可以访问 class Foo: xo = 'xo'#表明是公共的,内部外部都可以访问 __ox = '私有属性'#私有属性,只有 ...
- docker exec小脚本
经常要使用docker exec -it containerID bash 进入docker内部进行一些操作,干脆把它写成shell脚本节省时间. # 查看需要操作的容器id $ docker ps ...
- Kernel Space与User Space(转)
对于刚刚接触Linux的菜鸟来说,可能会不理解大家常说的Kernel Space和User Space是什么意思,我简单搜了一下,发现阮一峰写过一个比较简洁的介绍,贴下来给大家: 学习 Linux 时 ...
- 项目记事【StreamAPI】:使用 StreamAPI 简化对 Collection 的操作
最近项目里有这么一段代码,我在做 code-review 的时候,觉得可以使用 Java8 StreamAPI 简化一下. 这里先看一下代码(不是源码,一些敏感信息被我用其他类替代了): privat ...
- Struts2 标签库与OGNL的使用