dev_tools

UGUI series-principle analysis (Unity3D)

Unity UGUI Principles (1): Canvas rendering mode the goal Learn about different UI Render Modes Use environment and version Window 7 Unity 5.2.5 Render Mode There are three ways of UI rendering Screen Space Overlay: Screen Space Overlay Screen Space-Camera: Screen Space-Camera World Space: World coordinate space Screen Space-Overlay In this mode, the Camera will not be referenced, and the UI will be displayed directly on top of any graphics 1. Pixel Perfect: It can make the image clearer, but th

Sophia

schedule 91 min read

dev_tools

Byte Two: Tell me about your understanding of Spring boot's tomcat process source code loading web container!

Preface Spring boot load web container tomcat process source code analysis My local springboot version is 2.5.1, and the subsequent analysis is based on this version <parent> < groupId > org.springframework.boot </ groupId > < artifactId > spring-boot-starter-parent </ artifactId > < version > 2.5.1 </ version > < relativePath /> <!-- lookup parent from repository --> </parent> Copy code We introduce in the pom file <dependency> &

Jude

schedule 26 min read

dev_tools

A story triggered by global variables!

Preface Kobe asked: "Do you know what Los Angeles is like at four o'clock every morning ?" I haven't seen it, but I often see it at four o'clock in the Baiyun District of Guangzhou . Did you look at the figure following yourself in the morning sun and said: "I get up earlier than a chicken and sleep later than a dog. Maybe this is my last struggle." Wake up from sleep I have a habit of freeing up half an hour to read at noon. When I saw 1 o'clock at noon that day, I was really a little sleepy, s

Serenity

schedule 14 min read

dev_tools

Use Velero to migrate cluster resources across cloud platforms to TKE

Author: Li Quanjiang (jokey), Tencent Cloud Engineer, passionate about cloud native field. At present, he is mainly responsible for the technical support of Tencent Cloud TKE in sales and after-sales, and outputs reasonable technical solutions and best practices according to customer needs. Overview Velero is a very powerful open source tools, you can safely backup and restore, perform disaster recovery and migration Kubernetes cluster resources and persistent volumes, you can use Velero backup

Jayden

schedule 19 min read

dev_tools

Spring AOP use articles: familiar with the use of pre-notification, post-notification, return notification, exception notification, and understand its related features

Preface This time I will summarize 5 knowledge points about spring aop, mainly centering on five topics : AOP usage, AOP principle, transaction usage, transaction principle, transaction synchronizer usage . The principle of AOP is divided into two topics: 1. How to bind the various notifications we defined with the target method in the source code 2. What is the execution order of our aop proxy object? Copy code The principle of transaction is mainly based on a case of transaction propagation me

Layla

schedule 15 min read

dev_tools

Have you mastered these common handwritten questions?

Preface Handwritten code can test the interviewer's coding ability, so this kind of questions is often favored by interviewers. If you don't prepare in advance, there are often cases of missing 10,000. Now let's summarize the handwritten questions that are often asked. 1. Implement the instanceof operator The instanceof operator is used to detect whether the prototype property of the constructor appears on the prototype chain of an instance object. The left side of the operator is the instance o

Levi

schedule 21 min read

dev_tools

PyTorch on Google Cloud. How to train PyTorch model on AI platform

PyTorch is an open source machine learning and deep learning library, mainly developed by Facebook, used in more and more use cases to automate machine learning tasks, such as image recognition, natural language processing, translation, recommendation systems, etc. PyTorch is mainly used for research. In recent years, it has also gained huge appeal in the industry due to its ease of use and deployment . Google Cloud Artificial Intelligence Platform is a fully managed end-to-end platform for data

Steven

schedule 13 min read

dev_tools

Data Types in "Go Language Tutorial" | Go Theme Month

Hi everyone, my name is @ This article first appeared in the Los bamboo's official website This article is translated from Golang tutorial series This article is synchronized with the public account Luozhu Morning Tea House, please contact the author for reprinting. Creating is not easy, forming a habit, three consecutive qualities! The following are the basic types available in the Go language: bool Numeric Types int8, int16, int32, int64, int uint8, uint16, uint32, uint64, uint float32, float

Bentley

schedule 10 min read

dev_tools

Front-end automated testing

Front-end testing The benefits of writing test code: Find bugs faster, let the vast majority of bugs be found in the development stage, and improve product quality Unit testing, by running the test code, observing the input and output, sometimes makes people understand your code better than comments. It is conducive to code refactoring. If the test code of a project is well written, you can quickly check whether the refactoring is correct by checking whether the refactoring is correct by checkin

Paige

schedule 20 min read

dev_tools

Case analysis of key business jitter caused by memory recycling-on cloud native OS memory QoS guarantee

Jiang Biao, senior engineer of Tencent Cloud, has been focusing on operating system related technologies for more than 10 years, and is a senior Linux kernel enthusiast. He is currently responsible for the research and development of Tencent Cloud's native OS and the performance optimization of OS/virtualization. Lead Cloud-native scenarios, compared with traditional IDC scenarios, the business is more complex and diverse, and the native Linux kernel often seems a little powerless when facing va

Madison

schedule 25 min read

dev_tools

Java implementation of SFTP upload and download files and problems encountered

Recently, JSch is used to operate the upload and download of SFTP files. This article records a packaged tool class and two problems actually encountered. SFTP (Secure File Transfer Protocol) generally refers to the SSH file transfer protocol (SSH File Transfer Protocol), which uses encrypted transmission of authentication information and data, so compared to FTP, SFTP is very secure but the transmission efficiency is much lower. JSch ( Java Secure Channel ) is a pure Java implementation of SSH2

Bradley

schedule 9 min read

dev_tools

Interrupt Hwi: The secret weapon to improve the real-time performance and execution efficiency of the Hongmeng light core system

Abstract: This article led everyone to analyze the source code of the interrupt module of the Hongmeng Light Core, and grasp the concepts related to interrupts, interrupt initialization operations, interrupt creation, deletion, switch interrupt operations, etc. This article is shared from the Huawei Cloud Community "Hongmeng Light Core M Core Source Code Analysis Series Five Interrupt Hwi" , the original author: zhushy. In this article, we talk about interrupts, and will introduce the concept o

Aubrey

schedule 15 min read

dev_tools

Typescript generic package teaching package meeting

I don t know if there is such a scene in your daily work: Obviously TypescriptI have read the official document many times, but I actually wrote the code but suffered various difficulties. I encountered an error, and after searching to no avail, I had no choice but to write any. (I guess yes, otherwise you won't click on this article. What prevents you from getting closer to strong typing is in most cases because generics have not yet been fully mastered. This article will start with an example

Hannah

schedule 9 min read

dev_tools

Python uses PyTorch machine learning neural network to classify and predict bank customer churn model

Original link: tecdat.cn/?p=8522 Original source: Tuoduan Data Tribe Official Account    Classification problems belong to the category of machine learning problems, where given a set of features, the task is to predict discrete values. Some common examples of classification problems are predicting whether a tumor is cancer or whether a student is likely to pass an exam. In this article, given certain characteristics of bank customers, we will predict whether the customer is likely to

Carter

schedule 17 min read

dev_tools

React source code analysis 18 event system

React source code analysis 18 event system Video course (efficient learning): enter the course Course catalog: 1. Opening introduction and interview questions 2. The design concept of react 3.react source code architecture 4. Source directory structure and debugging 5.jsx&core api 6. Legacy and concurrent mode entry function 7.Fiber architecture 8.render stage 9.diff algorithm 10. Commit stage 11. Life cycle 12. Status update process 13.hooks source code 14. Handwritten hooks 15.scheduler&am

Eden

schedule 6 min read

dev_tools

docker build fastdfs

Introduction FastDFS is an open source lightweight distributed file system that manages files. Its functions include: file storage, file synchronization, file access (file upload, file download), etc., which solves the problem of large-capacity storage and load balancing. It is especially suitable for online services that use files as the carrier, such as photo album websites, video websites, and so on. FastDFS is tailor-made for the Internet, taking full consideration of mechanisms such as redu

Ashton

schedule 14 min read

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Realization of Markov Chain Monte Carlo MCMC Model in R Language

Original link: tecdat.cn/?p=2687 Original source: Tuoduan Data Tribe Official Account   What is MCMC and when should I use it? MCMC is just an algorithm that samples from the distribution. This is just one of many algorithms. This term stands for "Markov Chain Monte Carlo" because it is a "Monte Carlo" (ie random) method using "Markov Chain" (which we will discuss later). MCMC is just one type of Monte Carlo method, although many other commonly used methods can be regarded as simple special

Alejandro

schedule 10 min read

dev_tools

labelA labelB ( ) A B A B A B mask loss 0 loss 0 1 -1 mask y_true -1 y_pred loss 0 0 1 binary_crossentropy def mycrossentropy(y_true, y_pred): assert len(y_true.shape) == 2 y_true_np = y_true.numpy() y_pred_np = y_pred.numpy() tmp = y_pred_np.copy() for i in range(y_true.shape[0]): for j in range(y_true.shape[1]): if y_true_np[i][j] != -1: tmp[i][j] = y_true_np[i][j] tmp_tensor = tf.Variable(tmp) loss = binary_crossentropy(tmp_tensor, y_pred) return loss loss keras loss loss def get_model(): K.

Eden

schedule 24 min read

dev_tools

Architect s Growth Path: In-depth interpretation of Kafka connector error handling and dead letter queue

The Kafka connector is a part of Kafka and is a powerful framework for building streaming pipelines between Kafka and other technologies. It can be used to stream data from multiple places (including databases, message queues, and text files) to Kafka, and stream data from Kafka to the target end (such as document storage, NoSQL, database, object storage, etc.) . The real world is not perfect and errors are inevitable, so it is best that Kafka's pipeline can handle it as gracefully as possible w

Richard

schedule 19 min read

dev_tools

MVC principle of springboot (3)-custom registration

1. Background At present, in the field of java programming, the spring series are the most popular basic framework dependence besides jdk. Basically all applications use spring as the basic framework for architecture. As large as the first-line manufacturers (Ali, Tencent), as small as personal applications, after the project goes online, there will be some backdoor operations for online running status detection and data correction, etc., and these backdoors are not directly open to users or tra

Ashley

schedule 10 min read