Entropy

EntropyInformation gainCross EntropyKullback–Leibler divergence

gdb-source-file

Define a source path substitution ruleset substitute-path from to Define a source path substitution rule, and add it at the end of the current list of existing substitution rules. If a rule with

Optical-Networking

2017 2019 referenceEverything You Always Wanted to Know About Optical Networking – But Were Afraid to Ask Everything You Always Wanted to Know About Optical 2016 Speaker: Richard A Steenber

optical-transceivers

In order to transport high levels of data traffic over a network a component called an optical transceiver is required. Transceivers are lasers that are wavelength specific and convert electrical da

SingleCarrier-Multicarrier

Single carrier only uses one frequency point; multi carrier uses several frequency points to transmit information. If N frequencies transmit information to one user, the rate can be increased by

wavelength-bands

Telecommunication bands in the infraredIn optical communications, the part of the infrared spectrum that is used is divided into seven bands based on availability of light sources transmitting/

flex-grid-optical-networks

Fiber Optic cable — Channel Capacity:Frequency = Speed of Light (m/s) / Wavelength (nm) C-Band(Conventional Band): 1530 nm to 1565 nmSpectrum is Available in C Band:$$(\frac{299792458

Cpp/learn-Website

Resources online Complier example: cpp reflect C++ Insights: See your source code with the eyes of a compiler Quick C++ Benchmark online Code Browser

OADM (Optical Add-Drop Multiplexer)Introduction​ The evolution of single wavelength point-to-point transmission lines to wavelength division multiplexed optical networks has introduced a demand f

shared_ptr memory layout

Struct12345678910111213141516171819202122232425class __shared_ptr { element_type* _M_ptr; // Contained pointer. __shared_count<_Lp> _M_refcount; // Reference counter.

string memory layout

source12345678910111213141516171819202122232425262728// string.cpp#include <string>#include <iostream>void func(std::string &hello) { std::cout << hello.size(); std::c

tuple memory layout

Source123456789101112131415161718192021#include <map>#include <functional>#include <vector>#include <string>#include <iostream>template<typename... Args>void func

map memory layout

Source123456789101112131415161718#include <map>#include <iostream>void func(std::map<int, int> const &mapping) { for (auto &data : mapping) { std::cout &l

vector memory layout

Source1234567891011121314151617181920212223// vector.cpp#include <vector>#include <iostream>void func(std::vector<unsigned long> &datas) { for (auto &data : datas)

gdb

1. Invoking GDB1. specifying an executable programThe most usual way to start GDB is with one argument, specifying an executable program: 1> gdb program 2. an executable program and a core fileY

Process Id

1. ps12345678910111213141516# all process> ps -efUID PID PPID C STIME TTY TIME CMD> ps -auxUSER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND## PID: colum

Debug in Linux

Debug in LinuxTool listperformance profiling: perf trace, ftrace, strace, lstrace Two main classes of debugging tool today: checker (static and dynamic) did my code do bad thing x, y, z? Example

shell keyboard shortcut

tecmint ostechnix github help Move Cursor on The Command Line Ctrl+A or Home – moves the cursor to the start of a line. Ctrl+E or End – moves the cursor to the end of the line. Ctrl+B or Left Ar

git

git docs git tutorials github help basic1. create a first repo1234567891011# create a dir> mkdir dir && cd dir# initialize a repo> git init# check repo status> git status# add new

ssh port forward

openbsd ssh ssh SSH1. 服务器端安装ssh-server123456789101112131415161718# 1. 服务器端, ssh server安装# Ubuntu 没有安装SSH-server服务器，需要安装SSH服务器并开启 > sudo apt-get install openssh-server# 查看是否开启；sshd代表开启 > sudo

docker

Docker1. install1. dockerdocker 1234567891011121314151617181920# SET UP THE REPOSITORY> sudo apt-get update && sudo apt-get install \ apt-transport-https \ ca-certificates \ curl

CMD

Local environment1234567891011# list all environment variables > set > echo %PATH%## 添加环境变量# batch文件中, 当前脚本的目录> SET "SCRIPT_DIR=%~dp0"> SET "PATH=%SCRIPT_DIR%\x64/vc14/bin;

Modules and Packages

1. Modules​ A module is a file containing Python definitions and statements. The file name is the module name with the suffix .py appended. Within a module, the module’s name (as a string) is ava

protobuf

a message type field types 12string queryint32 page_numbe field numbers ​ each field in the message definition has a unique number. These field numbers are used to identify your fields in the m

Network Configuration and Troubleshooting

1. ifconfig commandifconfig (interface configurator) command is use to initialize an interface, assign IP Address to interface and enable or disable interface on demand. 12345678910111213141516171

Bloom Filter

布隆过滤器 检测值是可能存在集合中或一定不存在集合中 原理： -

xargs

xargsThe xargs command in UNIX is a command line utility for building an execution pipeline from standard input. Whilst tools like grep can accept standard input as a parameter, many other tools can

cuda

1. nvidia-smi1. 检查显卡型号1> nvidia-smi --query | grep "Product Name" 2. 计算模式12345678# check> nvidia-smi -q | grep Compute# set# Set MODE for compute applications:#

python installer

Installerubuntumethod 1123456789# To enable universe repository> sudo add-apt-repository universe> sudo add-apt-repository main> sudo add-apt-repository restricted> sudo add-apt-reposito

python virtualenv

VirtualenvInstallation1> pip install virtualenv User Guide1. use the same version12# 虚拟Python环境 ENV is path> virtual ENV 2. different python version123# PYTHON： 指定使用Python版本(C:\Python27\pyth