Huakun HuakunShen

Remove Duplicate Images from a Dataset

We will be using Python package imagededup to detect duplicate images.

There are multiple options (algorithms) for detecting duplicates.

Convolutional Neural Network (CNN)
Perceptual hashing (PHash)
Difference hashing (DHash)
Wavelet hashing (WHash)

Browser Bookmark Shortcut

Browser allows you to run JavaScript by clicking on a bookmark prefilled with JS code.

Simply Create a new bookmark, give it any name, and input the js code in a special format in the URL input box.

Video Playback Rate

javascript: var v = v = document.querySelector("video"); var t = prompt('Set the playback rate'); v.playbackRate = parseFloat(t);;

A simple Nginx Load Balancer implemented with 3 Nginx docker containers.

GitHub OAuth 2.0 Web Flow

https://docs.github.com/en/developers/apps/building-oauth-apps/authorizing-oauth-apps#web-application-flow

This repo contains a simple web app demonstrating how GitHub OAuth App work in Web Flow.

The web server is written in Flask.

Make sure flask server is installed.

GitHub OAuth 2.0 Device Flow

https://docs.github.com/en/developers/apps/building-oauth-apps/authorizing-oauth-apps#non-web-application-flow

Device Flow is for apps that cannot access a browser, such as a CLI app.

app.py is an python CLI console app that demonstrates how to do Device Flow OAuth.

To run it, you have to register a GitHub OAuth App.

openvpn3 Usage

Install openvpn3 from this website.

If you look at the man page of openvpn3, there are 2 main concepts:

config: a configuration of vpn where you connects to
session: a vpn session

Config

Suppose you have a configuration file called vpn.ovpn that’s connecting to a server in New York.

Option 1

Run this command on server

jupyter notebook --no-browser --ip <private ip> --port 8888

Access with http://<private ip>:8888

Nginx host static files

server {
    listen 8080 default_server;
    listen [::]:8080 default_server;

    root /var/www/html;

 index index.html index.htm index.nginx-debian.html;

HTTPS on Non-Default Port

Obtain an SSL certificate, https://zerossl.com/ is an option.

Get the following 3 files

ca_bundle.crt
certificate.crt
private.key

	package main

	import (
	"encoding/hex"
	"fmt"
	"net"
	"strings"
	)

	func main() {