Tag:unit

  • MSHA x chaos disaster recovery high availability practice

    Time:2021-1-20

    Author Yuan Zhi, Han LANSource|Alibaba cloud official account preface Due to the complexity of the external environment and the unreliability of hardware, the high availability of Internet services is facing great challenges, and there are many cases of service unavailability of major Internet companies caused by network outage, power failure and other accidents. Beneficial to […]

  • The advantages and disadvantages of NAND flash system

    Time:2021-1-13

    NAND flash is a popular nonvolatile memory, mainly because of its small size, low power consumption and durability. Although this technology is suitable for modern storage, many important features need to be considered when it is included in a larger system. These features apply to all types of storage, including durability, density and performance, price […]

  • Power on (New)

    Time:2021-1-11

    1、 Write on the front Centos7 suggests using systemctl to manage the self startup of services, which can meet the previous functions of service and chkconfig SYSTEMd is divided into system and user; system (/ user / lib / SYSTEMd / system /), user (/ etc / lib / SYSTEMd / user /) It is […]

  • 200 lines of JS code, take you to realize the code compiler (everyone can learn)

    Time:2020-12-30

    Recently saw the Nuggets and front-end official account numbers of ES2020 articles, want to say: let go of me, I still learn! In ES6, can you leave the daily development project first? 1、 Preface For front-end students, compiler may be suitable for magic box, surface ordinary, but often give us surprise.Compiler, as the name suggests, […]

  • First knowledge of Hadoop (2)

    Time:2020-11-30

    HDFS:HDFS files are divided into blocks for storage. The default size of HDFS is 64MB. The block is the logical unit of file storage and processing. Namenode is the management node that stores file metadata1. Mapping table of file and data block2. Mapping table of data block and data node Datanode is the working node […]

  • Simple course of recurrent neural network

    Time:2020-11-26

    By ReNu Khandelwal Let’s start with the following questions Cyclic neural network can solve the problems of artificial neural network and convolution neural network. Where can I use RNN? What is RNN and how does it work? Anti gradient loss and gradient explosion challenging RNN How can LSTM and Gru address these challenges Suppose we’re […]

  • Discussion on power system of GPS clock reference source

    Time:2020-10-29

    Discussion on power system of GPS clock reference source Discussion on power system of GPS clock reference source Jingzhun Electronic TechnologyOfficial wechat — ahjzsz [Abstract] this paper mainly analyzes the requirements of power grid dispatching integrated automation system for clock synchronization, and what impact will be caused when the system is not synchronized; and discusses […]

  • The general selector will greatly improve the capability of MRAM storage technology

    Time:2020-10-16

    A new innovative technology called universal selector will significantly improve the capabilities of existing and emerging storage technologies, including MRAM, DRAM and ReRAM, as it will provide a novel way to design vertical cell transistors to achieve higher levels of performance, reliability and density. The general-purpose selector of spin memory is a selective vertical epitaxial cell […]

  • Machine learning neural network recognition handwritten characters from 0!

    Time:2020-9-30

    1、 Problem description Today, Deng long shares with you the method of using feedforward neural network to recognize 10 types of handwritten characters. For those who don’t know the basis of neural network, you can check my last article: machine learning from 0 – understand the basics of neural network in simple terms Our goal […]

  • Hanjiawei reading notes Chapter 5 (data cube technology) – some algorithms

    Time:2020-9-29

    Reading notes of hanjiawai: Chapter 5 (data cube technology) BUC 1. BUC (bottom up construction) concept Calculation of iceberg cube from vertex cube downAlgorithm for computing sparse iceberg cubePruning based on a priori property###2. Algorithm calculation Cases a (A1, A2, A3), B (B1, B2), C (C1, C2)   (a1,,);(a1,b1,*);(a1,b1,c1);(a1,b1,c2)…… This process uses a priori property to […]

  • Only by understanding these eight advantages can you master unit testing

    Time:2020-9-28

    What is unit testing In computer programming, unit testing is a software testing method, through which each unit of source code can be tested to determine whether they are suitable for use. A unit is the smallest testable software component that typically performs a single cohesive function.Unit testing refers to the inspection and verification of […]

  • Reading notes of hanjiawai: Chapter 5 (data cube technology)

    Time:2020-9-28

    BUC 1. BUC (bottom up construction) concept Calculation of iceberg cube from vertex cube downAlgorithm for computing sparse iceberg cubePruning based on a priori property###2. Algorithm calculation Cases a (A1, A2, A3), B (B1, B2), C (C1, C2)   (a1,,);(a1,b1,*);(a1,b1,c1);(a1,b1,c2)…… This process uses a priori property to save time. If (A1, B1, *) does not meet […]