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.
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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
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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)
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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).
install arm64 package in x86 ubuntu for cross compile
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Install arm64 package directly in x86 ubuntu for cross compile.
GPT Chats
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Some chats from ChatGPT
argmax to multinomial
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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?
解决Ubuntu中文字体缺失，中文文档丑
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Ubuntu下使用WPS, LibreOffice编辑文档、演示稿时，发现Ubuntu自带的（免费）字体丑。同样的文档在Windows，MAC下看着没问题，在Ubuntu下排版都乱了（字体宽度不一样）。将Windows的中文字体拷过来就好了。
Fundamental Theorem of Linear Programming
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Fundamental Theorem of Linear Programming Given a linear program in standard form where A is an m × n matrix of rank m,
- (T1) if there is a feasible solution, there is a basic feasible solution;
- (T2) if there is an optimal feasible solution, there is an optimal basic feasible solution.
Sparse Error Correction via Logan Phenomenon [python]
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Python demo of Figure 2.16 Sparse Error Correction via Logan’s Phenomenon from High-Dimensional Data Analysis with Low-Dimensional Models - John Wright, Yi Ma, Page 65
Optimization Problems
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Problem summary of High-Dimensional Data Analysis with Low-Dimensional Models - John Wright, Yi Ma
L1 optimization by projected subgradient [python]
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Python implementation of Algorithm L1-Minimization by Projected Subgradient from High-Dimensional Data Analysis with Low-Dimensional Models - John Wright, Yi Ma, Page 63
Projection onto an Affine Subspace
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Let \(A\) be a matrix with size \(m \times n\). We want to project point z onto a plane \(\begin{align} \arg \min_{x} \lVert z-x \rVert_2 \\ \text{s.t. } Ax = y \end{align}\)
Subset Selection [python]
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Python implementation of Algorithm L0-Minimization by Exhaustive Search from High-Dimensional Data Analysis with Low-Dimensional Models - John Wright, Yi Ma, Page 48
ros2/arm免依赖交叉编译教程
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使用qemu运行arm docker模拟器，在模拟器中使用apt安装依赖后，将docker容器文件系统导出，作为cmake的sysroot，避免编译依赖。本文以ROS2为例，但方法并不限于ROS2
vietnam
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Nhatrang