Android system properties (SystemProperties)

1. System properties System properties are key-value pairs with special meanings in the system. We sometimes need to use system properties during the development process, such as getting the system software version, getting the device name, etc. Sometimes we also need to set custom properties. System properties are global and easy to access. 2. Get […]

Pytorch loss function, backpropagation and optimizer, Sequential use

Pytorch_Sequential usage, loss function, backpropagation and optimizer Article directory nn.Sequential Build a small practice Loss function and backpropagation optimizer nn.Sequential nn.Sequential is an ordered container. The modules used to build neural networks are added to the nn.Sequential() container in the order in which is passed into the constructor. import torch.nn as nn from collections import […]

Props, the three major attributes of React

Original link; React complete notes Props, the three major attributes of React React components use props to communicate with each other. Each parent component can provide props to its child components, thereby passing some information to it. Props may remind you of HTML attributes, but you can pass any JavaScript value through them, including objects, […]

Android–Gradle plug-in gradle-wrapper.properties

1. Android Studio version, Android Gradle plug-in version, Gradle version Android Studio uses Gradle to build code through the Android Gradle plug-in; After each upgrade of Android Studio, the Android Gradle plug-in is automatically updated, and the corresponding Gradle version will also change; Therefore, the following correspondence will be generated: (1) Correspondence between Android Studio […]

Solution to the mismatch between the field name in the JSON string and the field name in the Java class (use of @JsonProperty(“”) and @JSONField(name = “”))

1.1 Background 1.1.1 The so-called background, that is, what is the purpose and reason for writing this blog? Recently, I encountered a very strange requirement at work. I used WebService to adjust a third-party interface, but the return value of the third-party interface was an Xml structure. It was not surprising at first. But then […]

Design and implementation of smart property management website based on SSM

Get the source code at the end Development language: Java Java development tools: JDK1.8 Backend framework: SSM Front-end: developed using JSP technology Database: MySQL5.7 combined with Navicat management tool Server: Tomcat8.5 Development software: IDEA/Eclipse Is it a Maven project: Yes Table of Contents 1. Project Introduction 2. System functions 3. System project screenshots Administrator function […]

Python divides the training data set and test data set from the Labelme data set by category and proportion

Python divides the training data set and test data set from the Labelme data set according to categories and proportions Preface Prerequisites Related introduction lab environment Split the training data set and test data set from the Labelme data set by category and proportion Code Output results Foreword Due to my limited level, errors and […]

Solving errors in web projects, java.io.FileNotFoundException: druid.properties (the system cannot find the specified file); [spring factory decoupling development]

When using Tomcat9.0, spring5.0 framework original factory class decoupling, druid-1.0.9jar version, JDK9, MSQL8 version database to simulate web page login case, an error message that the druid.properties file cannot be found appears, the details are as follows [Case code posted at the end]; Normally speaking, the configuration file is placed under the src directory, and […]

How to choose field types appropriately when creating a table

Foreword When we create a table, there are several types of people who choose field types: Rigorous People who strictly investigate the possible size of each field and then make selections based on the limitations of different field types will have no problem creating relational data tables. Try to save yourself the trouble Set all […]