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Latest from xkx's Tech General Store

31 recent articles

xkx's Tech General Store

Jun 14, 2026 · Fundamentals

Lesson 4: Breaking Down Time Series into Trend, Seasonality, Cycle & Random Noise

This tutorial explains the four fundamental components of a time series—trend, seasonality, cyclicality, and random noise—covers additive and multiplicative decomposition models, provides step‑by‑step Python code with visualizations, and shows how removing these components improves stationarity for forecasting.

PythonTime Seriesadditive decomposition

0 likes · 14 min read

Lesson 4: Breaking Down Time Series into Trend, Seasonality, Cycle & Random Noise

xkx's Tech General Store

Jun 11, 2026 · Operations

Skip the Arthas CLI: Get Java Online Diagnosis in 5 Minutes with an Open‑Source GUI

Arthas Eyes packages Alibaba’s Arthas into a browser‑based GUI, using a Python FastAPI backend and a Vue 3 front‑end, allowing developers to attach to local or remote Java processes, visualize memory, GC, threads, trace calls, view flame graphs, and perform diagnostics within five minutes without memorizing CLI commands.

ArthasFastAPIGUI

0 likes · 6 min read

Skip the Arthas CLI: Get Java Online Diagnosis in 5 Minutes with an Open‑Source GUI

xkx's Tech General Store

Jun 10, 2026 · Artificial Intelligence

How to Evaluate Time Series Forecasting Models: Baselines, MAPE & MSE

This lesson explains how to set baseline reference models, use MAPE and MSE as quantitative evaluation metrics, and demonstrates their application on quarterly EPS data and simulated random walks to reveal the limits of predictability in non‑stationary series.

MSEMaPEPython

0 likes · 13 min read

How to Evaluate Time Series Forecasting Models: Baselines, MAPE & MSE

xkx's Tech General Store

Apr 16, 2026 · Artificial Intelligence

Understanding Vision Transformers: Core ViT Principles and Multimodal Applications

This article explains the Vision Transformer (ViT) architecture, compares it with CNNs and traditional NLP Transformers, details its encoding process and attention mechanisms, and demonstrates a practical leaf‑disease classification project that showcases ViT’s role in multimodal AI systems.

AI fundamentalsDeep LearningViT

0 likes · 10 min read

Understanding Vision Transformers: Core ViT Principles and Multimodal Applications

xkx's Tech General Store

Mar 19, 2026 · Information Security

6 Essential HTTP API Authentication Methods Every Developer Should Know

This technical guide walks developers through six HTTP API authentication techniques—None, Basic, Bearer Token, API Key, HMAC signature, and Open‑Platform hybrid—providing Java code samples, sequence diagrams, usage scenarios, and security best practices for each method.

API keyAuthenticationBasic Auth

0 likes · 16 min read

6 Essential HTTP API Authentication Methods Every Developer Should Know

xkx's Tech General Store

Mar 4, 2026 · Frontend Development

How to Build Browser Live Streaming for Small Projects with WebRTC and SRS

This article shows how seemingly complex real‑time video requirements can be satisfied cheaply by combining the open‑source WebRTC stack with the lightweight SRS media server, detailing the architecture, step‑by‑step signaling, full JavaScript code for publishing and playing, and the resulting end‑to‑end live‑streaming solution.

BrowserReal-time communicationSRS

0 likes · 10 min read

How to Build Browser Live Streaming for Small Projects with WebRTC and SRS

xkx's Tech General Store

Feb 27, 2026 · Frontend Development

Build a Pure H5 PDF Screen‑Sharing App with PDF.js and WebSocket

This article details a lightweight pure‑HTML5 solution for synchronizing PDF documents across participants using PDF.js for rendering and a FastAPI‑based WebSocket layer for real‑time state broadcasting, covering architecture, workflow, code snippets, and synchronization logic.

FastAPIHTML5PDF.js

0 likes · 9 min read

Build a Pure H5 PDF Screen‑Sharing App with PDF.js and WebSocket

xkx's Tech General Store

Feb 26, 2026 · Artificial Intelligence

Low‑Budget Face Verification for Small Projects: Deploying YuNet + SFace End‑to‑End

This article explains how to build a cost‑effective, CPU‑only face verification system for small‑scale projects using the lightweight YuNet detector and SFace recognizer, covering the models’ principles, implementation steps with OpenCV and Gradio, and performance considerations.

CPU inferenceGradioOpenCV

0 likes · 7 min read

Low‑Budget Face Verification for Small Projects: Deploying YuNet + SFace End‑to‑End

xkx's Tech General Store

Feb 8, 2026 · Artificial Intelligence

Mastering U‑Net: The Core Engine of Stable Diffusion – Theory to Practice

This article introduces the U‑Net architecture—originally designed for medical image segmentation—explains why its pixel‑wise processing makes it the core denoising engine in Stable Diffusion, details three key modifications for diffusion models, and walks through a ResNet‑50‑based implementation trained on the VOC2012 dataset, achieving 0.92 pixel accuracy and 0.64 mean IoU.

Deep LearningPyTorchResNet50

0 likes · 11 min read

Mastering U‑Net: The Core Engine of Stable Diffusion – Theory to Practice

xkx's Tech General Store

Feb 1, 2026 · Artificial Intelligence

OpenClaw’s Private‑Agent Architecture: How a Local AI Assistant Redefines Automation

The article explains OpenClaw’s three‑component architecture—Gateway, Client, and Node—showing how it differs from cloud‑only AI tools, enables private, locally‑deployed agents controllable via social apps, and demonstrates a daily AI news‑summary use case with step‑by‑step instructions.

AI AgentAutomationOpenClaw

0 likes · 9 min read

OpenClaw’s Private‑Agent Architecture: How a Local AI Assistant Redefines Automation