Found a total of 10000 related content
Hyperparameter Tuning with Python Optuna
Article Introduction：Optuna is a Python library for automated hyperparameter tuning, which is more efficient than traditional methods. 1. It searches for the best parameter combination by defining the objective function; 2. It supports a variety of optimization strategies such as TPE and CMA-ES; 3. It provides pruning, parallel optimization and visualization tools. Three steps are required when using it: 1. Define the objective function; 2. Create study object; 3. Run optimization. In actual applications, we can combine models such as LightGBM, and pay attention to reasonably setting parameter ranges, enabling pruning strategies, saving study and visual analysis.
2025-07-30
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161
Tutorial on implementing automatic background audio stop in React application
Article Introduction：This article aims to solve the problem that audio is still playing in the background when page switching in React single page app. The core solution is to use the React useEffect Hook's cleanup mechanism to automatically stop audio playback when components are uninstalled. The tutorial will provide detailed instructions on how to implement this function in combination with the use-sound library or native HTML5 elements, and provide code examples and precautions to ensure effective management of audio resources and optimization of user experience.
2025-08-08
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388
Strategies for matching associated data based on multiple conditions and time windows in Pandas
Article Introduction：This tutorial explores how to efficiently match and aggregate events in one DataFrame with related events in a specific time window (for example within 7 days) in another DataFrame. In view of the limitations of merge_asof, we will introduce two main methods: using the conditional_join function of the pyjanitor library to achieve multi-condition efficient connection, and pure Pandas merge combination filtering and aggregation scheme. The article will use specific example code to elaborate on the implementation steps, applicable scenarios and performance considerations of the two methods.
2025-09-02
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551
How to Use `strace` and `ltrace` for Debugging Linux Binaries
Article Introduction：Strace is used to track system calls, such as file operations, network activities and process creation; 2. ltrace is used to track shared library function calls, such as malloc, printf; 3. Use strace-etrace=open,read,write to debug files or I/O problems; 4. Use ltrace-e "malloc@libc.so*" to locate memory-related errors; 5. The two can be used in combination to associate library calls and system call behavior; 6. It is recommended to track child processes through the -f option and save output with -o to reduce interference; 7. Pay attention to performance overhead and static linkage restrictions on ltrace, but the two are still effective for passive code debugging.
2025-07-27
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219
How to optimize image assets in a Vue app?
Article Introduction：Optimizing image resources in Vue applications requires starting from three aspects: format selection, lazy loading and distribution strategies. 1. Use WebP format to replace PNG/JPG, and automatically generate and fall back through the construction tool; 2. Enable lazy loading, combine IntersectionObserver or component library, configure placeholder maps and exclude the content on the first screen; 3. Introduce CDN distribution as needed, call tool function stitching paths uniformly, and access object storage acceleration services; 4. Compress pictures before uploading, and further reduce the size in combination with automation tools or CI/CD processes.
2025-07-10
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658
Functional Programming Concepts in JavaScript
Article Introduction：The core concepts of functional programming include: 1. Pure functions: the same input always returns the same output without side effects, such as add(a,b); 2. Immutability: Do not modify the original data, create new objects or arrays through extension operators; 3. Advanced functions: receive or return functions, such as map, filter, reduce and custom logger; 4. Function combination: combine multiple functions into new functions, and implement chain calls using compose; 5. Curry: convert multi-parameter functions into a sequence of single-parameter functions to improve reusability; 6. Avoid side effects: separate calculations from side effects to ensure that logic is testable. These principles help to write clearer, maintainable code and are widely available in React and Redux
2025-07-27
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648
How to convert a string to an int in C ?
Article Introduction：The recommended way to convert a string to an integer in C is to use the std::stoi function. 1.std::stoi is the simplest and most direct way in modern C (C 11 and above). It is defined in a header file and can automatically handle most cases, but will throw exceptions. It needs to be used in combination with try-catch; 2.atoi is a C standard library function, which accepts constchar* type, which is simple to use but poor error handling ability, and returns 0 when encountering illegal characters; 3.std::istringstream provides a more flexible parsing method, suitable for complex parsing scenarios, but has a slightly lower performance. Choose the appropriate method according to your needs, and recommend std::stoi first.
2025-07-09
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999
MySQL dual master hot standby solution based on Keepalived
Article Introduction：The MySQL dual master hot standby solution based on Keepalived ensures that the database service is not interrupted. 1. Keepalived monitors the database instance, and switches the VIP to the backup library when the main library fails; 2. MySQL replication function (such as GTID) ensures the synchronization and consistency of the data of the two main libraries; 3. Keepalived relies on the heartbeat package to detect the status of the main node through the VRRP protocol, and switches the VIP according to the configuration parameters (priority, detection interval, etc.). Carefully configures to avoid the phenomenon of split brain; 4. A script is required to monitor the MySQL status and troubleshoot problems in combination with logs; 5. High availability requires selecting appropriate hardware, regular backups, reasonable monitoring, and continuous maintenance and optimization.
2025-04-08
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1178
How to properly initialize a golang struct with default values?
Article Introduction：In Go language, the default initialization of the structure can be achieved through constructors, nested structures, or reflections. 1. It is recommended to use a constructor starting with New to return a structure pointer with a default value to improve readability and scalability; 2. If multiple structures share fields, they can be extracted into an infrastructure structure and encapsulated default initialization logic to reduce duplicate code; 3. For complex scenarios, if a large number of field default values ??need to be dynamically processed, a general initialization function can be written in combination with field labels and reflections, but pay attention to performance and readability. The standard library does not directly support this function, and some third-party libraries are optional. The core is to keep the initialization logic unified and clear.
2025-06-30
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518
How to make a program sleep or wait in Python
Article Introduction：In Python, the easiest way to get a program to pause execution is to use the time.sleep() function. 1.time.sleep() is a function provided by the standard library time. It accepts a floating point parameter representing the number of seconds. It can achieve accurate time delay, but will block the current thread. 2. In a multi-threading environment, multiple threads can be created in combination with the threading module, so that different tasks call time.sleep() without affecting each other. 3. For asynchronous programs, asyncio.sleep() should be used with the await keyword. It will not block the entire program and only hang the current coroutine, which is suitable for high concurrency scenarios. 4. When using it, be careful to avoid being in the main thread of the GUI or Web application.
2025-07-21
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627
Implementing MySQL Data Anonymization Techniques
Article Introduction：Data anonymization can be implemented in MySQL in a variety of ways to protect sensitive information. First, replace the field value and use random data to replace fields such as name and phone number, such as using ELT to generate a new name; second, use hash function to maintain consistency, such as using MD5 to combine salt values to generate fixed substitution values; third, partial masking or fuzzing processing, such as using SUBSTR and CONCAT for ID card numbers to hide the intermediate part; in addition, attention should be paid to backing up the original data, priority operation in the replica library, consideration of performance impact, combination with desensitization tools, and verification of desensitization effects.
2025-07-27
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173
How to trim whitespace from a string in C
Article Introduction：The C standard library does not directly provide functions to remove string whitespace characters, but can be efficiently implemented by combining std::find_if in combination with std::isspace and string iterator; the trim function uses forward and reverse iterators to find the first and last non-whitespace characters respectively, and then constructs the substring return to remove the beginning and end blanks; ltrim only uses forward iterators to find the first non-whitespace character to remove the leading blanks; rtrim searches the last non-whitespace character through reverse iterators and converts it to the forward iterator position to remove trailing blanks; these methods all return new strings without modifying the original string. If you need to modify it in place, you should assign the value back to the original variable, and the characters passing in std::isspace should be converted to un
2025-08-24
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987
Dave The Diver: How To Catch Spider Crabs
Article Introduction：In Dave The Diver, there are some creatures that are not easy to catch. Or, catch alive that is. The spider crab is one of those very species, making it seem like the only way to bring these crustaceans back up to land is to viciously crack them up w
2025-01-10
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934
Prepare for Interview Like a Pro with Interview Questions CLI
Article Introduction：Prepare for Interview Like a Pro with Interview Questions CLI
What is the Interview Questions CLI?
The Interview Questions CLI is a command-line tool designed for JavaScript learners and developers who want to enhance their interview
2025-01-10
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1553
