Machine learning Python Version (Section 3)

Model selection and tuning 1. Cross validation Cross validation process Cross validation: the data obtained are divided into training and validation sets. The following figure is an example: divide the data into 5 copies, one of which is used as the verification set. Then, after five tests (groups), ...

Posted on Thu, 25 Jun 2020 07:48:06 -0400 by taya

CopyOnWriteArrayList special points, compare ArrayList

CopyOnWriteArrayList special points, compare ArrayList ArrayList can use the iterator's remove method to delete elements, CopyOnWriteArrayList can't use the iterator's remove method to delete elements, but can only use the collection's remove method to delete elements public class Demo15 { publi ...

Posted on Thu, 25 Jun 2020 07:03:39 -0400 by [L3]sPARTAN

Virtual machine - TEST compiler (4)

catalog 1 virtual machine 1.1 function 1.2 characteristics 1.3 design ideas 2 complete code 3 Summary Lexical analysis: Lexical analysis -- TEST compiler (1) Parsing: Syntax analysis -- TEST compiler (2) Semantic analysis: Semantic analysis -- TEST compiler (3) 1 virtual machine 1.1 function ...

Posted on Thu, 25 Jun 2020 00:43:25 -0400 by spiyun

Step by step learning linux operating system: 10 process data structure II

task_ Source location of struct: linux-4.13.16\include\linux\sched.h Operation statistics Including user / kernel running time, up / down switching times, startup time, etc; u64 utime;//CPU time consumed in user mode u64 stime;//CPU time consumed by kernel state unsigned long nvcsw; ...

Posted on Thu, 25 Jun 2020 00:28:10 -0400 by mjurmann

Deep analysis of Map source code

preface map set is the set of key value The difference between HashMap and HashTable HashMap is thread unsafe. HashTable is read and write with synchronized lock. It is thread safe and inefficient. Hashtab cannot store null key and value. HashMap can store null key and value in the first position of ...

Posted on Wed, 24 Jun 2020 22:22:38 -0400 by thomasadam83

SQL Mathematical Functions, String Functions for Programmers

Article Directory Preface 1. Mathematical Functions 1.1 ABS 1.2 CEIL 1.3 FLOOR 1.4 MOD 1.5 RAND 1.6 ROUND 1.7 TRUNCATE 1.8 POW 2. String Functions 2.1 CHAR_LENGTH and LENGTH 2.2 CONCAT 2.3 INSERT 2.4 LOWER and UPPER 2.5 LEFT and RIGHT 2.6 REPLACE 2.7 TRIM 2.8 SUBSTRING 2.9 LOCATE,POSITION,INSTR 2. ...

Posted on Wed, 24 Jun 2020 12:55:28 -0400 by xgab

JavaScript common API collection summary

This chapter includes DOM operation, CSS operation, Object (Object object Object, Array Object, Number Object, String Object, Math Object, JSON Object and Console Object) operation, which is worth collecting.1, Node 1.1 node properties Node.nodeName //Return node name, read-only Node.nodeType //Retu ...

Posted on Wed, 24 Jun 2020 03:48:24 -0400 by phaseonemedia

UnityStandardAsset project, source code analysis_ 2_ Racing game [player control]_ Vehicle core control

Address of the previous chapter: UnityStandardAsset project, source code analysis_ 1_ Racing game [player control]_ input system In the previous chapter, we learned the general process of vehicle control, and analyzed the input system, that is, those classes were called during the process from the play ...

Posted on Wed, 24 Jun 2020 02:35:42 -0400 by noirsith

The new colleague "optimizes" the if else with the strategy mode. The technical director said: can you think about it and then change it?

This article comes from the author's contribution, the original author: God loves apples At present, shell house hunting is my employer in Mordor. I usually focus on some java related technologies. I hope you can find something useful in this article. Personal level is limited. If there is any error in the article, please point it out and commu ...

Posted on Wed, 24 Jun 2020 01:01:04 -0400 by storyboo

Front End Learning Records 3-HTML

Front End Learning Records 3-HTML list Unordered list ul-li Differences between Tables and Unordered Tables Ordered List ol-li Custom List dl-dt-dd form input control Selectlist control Form label label Do not use for and id methods in label tags textarea control form Form Field (Write the necessa ...

Posted on Tue, 23 Jun 2020 20:49:52 -0400 by Leppy