Route handlers enable you to define multiple routes for a path. The example below defines two routes for GET requests to the /user/:id path. The second route will not cause any problems, but it will never get called because the first route ends the r…

learning express error handle code: const express = require('express'); const app = express(); const fs = require('fs'); app.get('/', function (req, res, next){ fs.readFile('file', function (err, data) { if(err){ next(err) }else{ res.send(data); } })…

learning express error handle code: const express = require('express'); const app = express(); app.get('/', function (req, res){ throw new Error("BROKEN"); }); app.listen(); result:…

learning express view engine function const express = require('express'); const app = express(); app.set('views','./views'); app.set('view engine', 'pug'); app.get('/', function(req, res){ res.render('index',{title: 'hey', message: 'hello panzidong u…

learning express.Router() code: const express = require('express'); const app = express(); var router = express.Router(); var cookieParser = require('cookie-parser'); app.use(cookieParser()); router.use(function (req, res, next) { //if (!req.headers[…

learning  express  middleware var express = require('express'); var app = express(); var myLogger = function (req, res, next) { log++; console.log('var log =', log); next(); }; app.use(myLogger); app.get('/', function(req, res){ res.send("hello world…

learning express route function const express = require('express'); const app = express(); app.get('/', function (req, res) { res.send('root'); }); app.get('/about', function (req, res) { res.send('about'); }); app.get('/random.txt',function (req, re…

router-level middleware works in the same way as application-level middleware, except it is bound to an instance of  express.Router(). code: var express = require('express'); var app = express(); var router = express.Router(); // a middleware functio…

To skip the rest of the middleware functions from a router middleware stack, call next('route') to pass control to the next route. const express = require('express'); const app = express(); app.get('/user/:id', function (req, res, next) { ') next('ro…

code: use application middleware var express = require('express'); var app = express(); app.use(function (req, res, next) { console.log('Time', Date.now()); next() }); app.use('/user/:id', function (req, res, next) { console.log('Request Type:', req.…

install express-generator C:\Users\admin\WebstormProjects\learning-express-step2>npm install express-generator -g C:\Users\admin\AppData\Roaming\npm\express -> C:\Users\admin\AppData\Roaming\npm\node_modules\express-generator\bin\express-cli.js + ex…

first : create new project then install express package : npm install express --savenpm WARN saveError ENOENT: no such file or directory, open 'C:\Users\admin\WebstormProjects\IPSO-demo\package.json'npm WARN enoent ENOENT: no such file or directory,…

when develop expree meet some errors, we show how to solve Error: No default engine was specified and no extension was provided. How to solve: app.set('view engine','ejs'); Error: Cannot find module 'ejs' How to solve: C:\Users\admin\WebstormProjects…

use static resourceL: const express = require('express'); const app = express(); app.use(express.static('public')); app.listen(, () => console.log('Example app listening on port 3000!')); result :…

https://www.quora.com/How-do-I-learn-machine-learning-1?redirected_qid=6578644   How Can I Learn X? Learning Machine Learning Learning About Computer Science Educational Resources Advice Artificial Intelligence How-to Question Learning New Things Lea…

Step 1: Basic Python Skills install Anacondaincluding numpy, scikit-learn, and matplotlib Step 2: Foundational Machine Learning Skills Unofficial Andrew Ng course notes Tom Mitchell Machine Learning Lectures Step 3: Scientific Python Packages Overvie…

在学习react的时候,经常用create-react-app来创建web应用,然而写到后面总有连自己服务器和数据库的需求,create-react-app创建的是一个webpack-dev-server,主要用来进行webpack的编译和热加载(HMR),所以想要把这两个东西融合,就是既能监听修改实现热加载,然后用的又是自己的express服务器.网上有两种解决方案:1.设置代理,同时启动express和webpack-dev-server,然后将webpack-dev-server代理到过来…

I joined Analytics Vidhya as an intern last summer. I had no clue what was in store for me. I had been following the blog for some time and liked the community, but did not know what to expect as an intern. The initial few days were good – all the in…

基于learning armbian step(4) 的总结,我们来实践一下,接下来的会把整个构建的log都贴出来: vmuser@vmuser-virtual-machine:~/qemu-arm$ sudo apt-get install qemu-user-static [sudo] password for vmuser: Reading package lists... Done Building dependency tree Reading state information...…

A Complete Tutorial on Tree Based Modeling from Scratch (in R & Python) MACHINE LEARNING PYTHON R   SHARE      MANISH SARASWAT, APRIL 12, 2016 / 52     Introduction Tree based learning algorithms are considered to be one of the best and mostly used s…

1. 2. <?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping > <class name=&…

1. <?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping > <class name=&quo…

介绍 DeepLearning课程总共五大章节,该系列笔记将按照课程安排进行记录. 另外第一章的前两周的课程在之前的Andrew Ng机器学习课程笔记(博客园)&Andrew Ng机器学习课程笔记(CSDN)系列笔记中都有提到,所以这里不再赘述. 1.神经网络概要 注意:这一系列的课程中用中括号表示层数,例如\(a^{[1]}\)表示第二层(隐藏层)的数据. 2.神经网络表示 这个图的内容有点多,跟着下面的步骤来理解这个图吧: 首先看蓝色字体,这个2层的神经网络(输入层一般理解成第0层)有输入层…

PCA(Principal Components Analysis),它是一种“投影(projection)技巧”,就是把高维空间上的数据映射到低维空间.比如三维空间的一个球,往坐标轴方向投影,变成了一个圆.球是3维的,圆是2维的.在球变成圆的这个投影过程中,丢失了原来物体(球)的一部分“性质”---圆不是球了,只有面积没有体积了:也保留了原来物体的一部分性质---圆 和 球 还是很像的…… 而对于一个训练样本y而言,假设它有M个特征(M维),y={y1, y2,...yM},通过PCA,进行投…

TensorFlow笔记-07-神经网络优化-学习率,滑动平均 学习率 学习率 learning_rate: 表示了每次参数更新的幅度大小.学习率过大,会导致待优化的参数在最小值附近波动,不收敛:学习率过小,会导致待优化的参数收敛缓慢 在训练过程中,参数的更新向着损失函数梯度下降的方向 参数的更新公式为: wn+1 = wn - learning_rate▽ 假设损失函数 loss = (w + 1)2.梯度是损失函数 loss 的导数为 ▽ = 2w + 2 .如参数初值为5,学习率为 0.2…

大部分:   静态图部分,即静态不动的图 1.用例图, Use case diagram 1.展示系统核心功能及与其交互的用户ACTOR 表示:椭圆…

Step 0: Initialize constants and parameters Step 1: Load data Step 2: Implement softmaxCost Implementation Tip: Preventing overflows - in softmax regression, you will have to compute the hypothesis When the products are large, the exponential functio…

一.完美立方 编写一个程序,对任给的正整数N (N≤100),寻找所有的四元组(a, b, c, d),使得a^3= b^3 + c^3 + d^3,其中a,b,c,d 大于 1, 小于等于N. 输入一个正整数N (N≤100),输出 每行输出一个完美立方.输出格式为: Cube = a, Triple = (b,c,d) 其中a,b,c,d所在位置分别用实际求出四元组值代入. 请按照a的值,从小到大依次输出.当两个完美立方 等式中a的值相同,则b值小的优先输出,仍相同则c值小的优先输出,再相同…

大部分:   静态图部分,即静态不动的图 1.用例图, Use case diagram 1.展示系统核心功能及与其交互的用户ACTOR 表示:椭圆…

Pytorch学习之源码理解:pytorch/examples/mnists from __future__ import print_function import argparse import torch import torch.nn as nn import torch.nn.functional as F import torch.optim as optim from torchvision import datasets, transforms from torch.optim.…