xoofee

xoofee

for meaning of existence

Blog posts

2024

GPT Chats

6 minute read

Published:

Some chats from ChatGPT

argmax to multinomial

2 minute read

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?

解决Ubuntu中文字体缺失，中文文档丑

less than 1 minute read

Published:

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

1 minute read

Published:

Fundamental Theorem of Linear Programming Given a linear program in standard form where A is an m × n matrix of rank m,

  1. (T1) if there is a feasible solution, there is a basic feasible solution;
  2. (T2) if there is an optimal feasible solution, there is an optimal basic feasible solution.

Optimization Problems

2 minute read

Published:

Problem summary of High-Dimensional Data Analysis with Low-Dimensional Models - John Wright, Yi Ma

L1 optimization by projected subgradient [python]

1 minute read

Published:

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

1 minute read

Published:

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]

1 minute read

Published:

Python implementation of Algorithm L0-Minimization by Exhaustive Search from High-Dimensional Data Analysis with Low-Dimensional Models - John Wright, Yi Ma, Page 48

2023

ros2/arm免依赖交叉编译教程

1 minute read

Published:

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

2012

vietnam

less than 1 minute read

Published:

Nhatrang