Humanoid Robots Are Still a Bet
Published:
Current LLMs are already useful, but they still have several hard limits.
Blog posts
2026
VS Code Codex Extension UI Freeze May Be Caused by Missing Shell Environment
Published:
Sometimes the Codex extension in VS Code can get stuck even though the Codex CLI still works normally.
Syncing Two Git Machines Over LAN Without a Central Server
Published:
Sometimes the normal Git server is temporarily unavailable, but you still need to move work between two machines on the same local network.
VFS 签证预约系统访问慢，可以先检查 DNS
Published:
在中国使用 VFS 签证预约系统时，如果 Cloudflare 验证加载很慢、页面经常卡死或登录被临时锁定，可以先尝试把 DNS 改成 1.1.1.1 和 8.8.8.8。
Ubuntu 下给微信添加显示/隐藏快捷键
Published:
Linux 版微信在 Ubuntu 中没有内置的显示/隐藏窗口快捷键，可以用 xdotool 和 GNOME 自定义快捷键实现一个类似的切换功能。
BLE Random Address Type Bits
Published:
BLE random device addresses encode their address type in the two most significant bits of the random address.
Fixing XWayland High CPU Spikes on Ubuntu 24.04 with Intel + NVIDIA Hybrid Graphics
Published:
How installing the proprietary NVIDIA driver fixed repeated XWayland CPU spikes when launching Electron and Chromium apps on an Ubuntu 24.04 Intel + NVIDIA hybrid laptop.
macOS 下清理应用状态修复 WeType 简繁切换残留问题
Published:
macOS 下遇到一个 WeType 的奇怪问题：切换到繁体输入后，再切回简体输入，有些字仍然会按繁体输出，例如 還、總、覆 这类结果会残留在简体模式里。
GitLab in Docker showed 502 after restart: root cause and fix
Published:
I ran into a GitLab outage in a Docker-based deployment where the web UI returned 502 Bad Gateway, even though the container itself was still running and even showed as healthy in docker ps.
A Professional Git Worktree Workflow with a Bare Repository
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If you regularly switch between branches, keep separate runtime environments, or want AI agents to work without disturbing your main checkout, a bare repository plus git worktree is one of the cleanest setups.
Run WireGuard on Apple Silicon macOS with wg-quick and launchd
Published:
Quick notes for running a WireGuard tunnel on an Apple Silicon Mac with wg-quick and launchd.
Why SSH Still Asks for a Password After PasswordAuthentication no
Published:
If you set PasswordAuthentication no in sshd_config and SSH still accepts a password, the problem is usually not your keys. The problem is that OpenSSH can still allow password-like login through KbdInteractiveAuthentication, often backed by PAM.
Codex CLI 0.119.0 on Windows: prefix_rule for git is not usable
Published:
Quick note from testing codex cli 0.119.0 on Windows: prefix_rule was not practical for allowing common git commands in a reusable way.
Install OpenSSH Server on Windows from the Win32-OpenSSH release zip
Published:
Quick notes for setting up the Windows OpenSSH server from the OpenSSH-Win64.zip package.
Good Software Rules
Published:
These are rules to reread, not slogans to admire.
OpenCV Calibration: Calling Hierarchies for H, F, E, and BA
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Calling hierarchies for computing homography (H), fundamental matrix (F), essential matrix (E), and bundle adjustment (BA) in OpenCV.
Gold-Standard Error vs. Symmetric Transfer Error
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Why gold-standard geometric error and symmetric transfer error differ, and when each is appropriate for evaluation and optimization.
Metric Rectification: Two Constraints from a Circle or Length Ratios
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Why a circle becomes an ellipse after affine distortion, and how that ellipse (or two known length ratios) provides the two constraints needed for metric rectification.
Planar Homology: Applications and Intuition
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Exploring the applications and intuitive understanding of planar homologies in projective geometry, computer vision, and geometric transformations.
2025
Problems of China’s Math Education for Students
Published:
An analysis of the systemic problems in China’s math education system, examining what works and what doesn’t, and comparing approaches with other countries.