The term "normalization" is an informal expression in statistics, so the phrase "normalized data" can have multiple meanings. In most cases, normalizing data eliminates units of measurement, making it easier to compare data from different sources.

This article introduces a very important dimensionality reduction method in machine learning—Principal Component Analysis.

It is always known that bit and byte are two concepts, one is binary digit, and the other is a byte unit consisting of 8 bits. However, in practical situations, people still confuse bit and byte in various network speed abbreviations. This article summarizes the knowledge I found.

90% of drivers believe their driving skills are above average, 90% think their IQ is above the average IQ of the population, and the key is this can actually be consistent with real data — it's true and not fabricated.

s-tui is a free and open-source command-line UI tool for monitoring computer CPU. It can monitor CPU temperature, frequency, etc. in real-time and display it graphically. This is a Python tool that can be installed via pip, but requires root permissions. It can be used via SSH login to monitor CPU status graphically.

Getting back on track, today's tutorial by Chunjiang Muker shows how to automatically stream Douyu live on CentOS 7 to achieve 24/7 uninterrupted streaming.

A few days ago on WeChat, I discovered that Tongji University actually has its own open source software mirror site. Our lab servers are still using Alibaba Cloud's CentOS 7 mirror. Wouldn't it be much faster if we switched to the university's mirror? So how to change CentOS 7 public repo to Tongji University's mirror?

Virmach's Black Friday machines appear and disappear rapidly. For hosting enthusiasts, constantly checking current VPS prices and deciding whether to buy is troublesome. This article lists Black Friday machine configurations using sklearn and predicts VPS prices with machine learning to alert users if prices are cheap.

During the recent Black Friday sales, I grabbed a special machine from Virmach, so I thought of testing its performance by running some VPS performance and network tests since the machine looks pretty good.

How to batch replace strings in Linux? At first, I thought about using sed with -r or some iterative method, but found sed doesn't support iteration parameters. So, I use find to get files and sed to replace strings.

During Linux system development, sometimes your program might crash or be stopped. To keep it running continuously, adding the program to the service list is a very good practice.

I often play Sudoku in my leisure time as a form of relaxation. My usual method involves eliminating duplicates and filling in unique numbers first, then proceeding step by step. However, it's inevitable to guess numbers and adjust based on feedback. So, is there a better algorithm to solve Sudoku puzzles? Here, I will use the backtracking method in Python to solve 9x9 expert-level Sudoku puzzles.