Abstract

This tutorial int

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过拟合

• 添加其他特征项。组合、泛化、相关性、上下文特征、平台特征等特征是特征添加的重要手段，有时候特征项不够会导致模型欠拟合。
• 添加多项式特征。例如将线性模型添加二次项或三次项使模型泛化能力更强。例如，FM（Factorization Machine）模型、FFM（Field-aware Factorization Machine）模型，其实就是线性模型，增加了二阶多项式，保证了模型一定的拟合程度。
• 可以增加模型的复杂程度。
• 减小正则化系数。正则化的目的是用来防止过拟合的，但是现在模型出现了欠拟合，则需要减少正则化参数。

欠拟合

• 重新清洗数据，数据不纯会导致过拟合

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Linux Basics - Introduction

This is a series of tutorials for commonly used Linux commands. All examples included are based on CentOS 7.5

$ lsb_release -a
LSB Version:    :core-4.1-amd64:core-4.1-noarch
Distributor ID: CentOS
Description:    CentOS Linux release 7.5.1804 (Core)
Release:    7.5.1804

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Linux Basics - First Step

Whenever you open a terminal and want to perform some kind of tasks, you start to type Linux commands. But there could be thousands of commands and even a much larger amount of options to go with these commands. How could you remember all of them? The answer is impossible.

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Linux Basics - Daily Recipe

Among an ocean of Linux commands, some are used much more frequently than others. Here is the listing of some of the most common ones:

• pwd: Show your current working directory
• cd: Change directory
• ls: Show files in current working directory
• cat: Show content of a file
• mk

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