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.
Blog posts
2026
Good Software Rules
Published:
These are rules to reread, not slogans to admire.
OpenCV Calibration: Calling Hierarchies for H, F, E, and BA
Published:
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
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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.
Command-Line Scripts for Virtual Machine Management with Libvirt/KVM/QEMU
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A collection of command-line scripts and tools for managing virtual machines using Libvirt, KVM, and QEMU, covering common VM operations, automation, and best practices.
Solving OpenGL/EGL Problems When Running ORB-SLAM3 in Docker Container on NVIDIA GPU Host
Published:
A guide to resolving OpenGL/EGL initialization and rendering issues when running ORB-SLAM3 in Docker containers on hosts with NVIDIA GPUs, covering proper GPU passthrough, EGL context setup, and common pitfalls.
Setting Up Jupyter Terminal Keyboard Shortcut
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Learn how to quickly create a new terminal in Jupyter using a custom keyboard shortcut. This is especially useful for developers who frequently need to run shell commands while working in Jupyter notebooks.
Building a Bioinformatics Docker Environment with Python, R, and Jupyter Lab
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A comprehensive Docker setup for bioinformatics work, featuring non-root user configuration, Python virtual environments, R with Seurat, and Jupyter Lab with multi-profile docker-compose support.
HAL Across Domains: How Different Systems Define Hardware Abstraction Layers
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The term ‘HAL’ means different things in different domains—from kernel-level platform abstraction to application-level sensor control. Understanding these differences helps clarify domain-specific architecture choices.
Why LinuxCNC Drivers Are HAL Components: Understanding a Domain-Specific Architecture
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The HAL is not necessarily a module — it’s a boundary of responsibility between hardware-dependent and hardware-independent code.
Create a desktop entry for Cursor AppImage (with icon extraction)
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Quick notes to make a Cursor AppImage launchable from your desktop menus and include a proper icon.
Fix Android Java version in Flutter plugins (Pub cache script)
Published:
Having builds fail with:
GraphHopper paths are edges, not nodes
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GraphHopper makes a deliberate design choice: paths are represented by edges, not nodes. This matters for correctness (turn restrictions/costs), fidelity (multiple parallel edges between the same nodes), and efficiency (edge properties drive routing).
2024
install arm64 package in x86 ubuntu for cross compile
Published:
Install arm64 package directly in x86 ubuntu for cross compile.
GPT Chats
Published:
Some chats from ChatGPT
argmax to multinomial
Published:
Why use a multinomial function to get the next word prediction in a GPT (generative) model rather than outputting the id with the largest probability?