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原创 git总结
git add .：add all filesgit rm --cached <file>: undo addgit commit -am <message>：add and commit
2021-04-28 20:01:37
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原创 GPU服务器环境配置
下载早期版本的whl文件：https://download.pytorch.org/whl/torch_stable.html
2021-03-23 16:45:55
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原创 ubuntu20 基础配置整理
换镜像源。参考文章安装openssh-sever。参考文章安装oh-my-zsh：参考文章1和文章2注：如果github太慢可以用gitee上的镜像：https://gitee.com/mirrors如clone oh-my-zsh时可将命令git clone https://github.com/robbyrussell/oh-my-zsh.git ~/.oh-my-zsh修改为git clone https://gitee.com/mirrors/oh-my-zsh.git ~/.oh.
2021-01-25 01:43:29
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原创 在Blender python中安装OpenEXR报错OpenEXR.cpp:1:10: fatal error: Python.h: No such file or directory
Blender python安装OpenEXR
2023-02-16 18:54:21
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原创 python可变长参数
def f(a=1, b=2): print(a) print(b)# both are equivalentf(*[0], **{'b': 3})print('-----')f(0, b=3)
2022-01-24 16:32:44
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原创 正态分布随机数列的期望与方差分布（Student`s Theorem）
X1,⋯ ,Xn∼iidN(μ,σ2)X_1,\cdots,X_n \sim \text{iid} N(\mu,\sigma^2)X1,⋯,Xn∼iidN(μ,σ2)Xˉ∼N(μ,σ2n)\bar X \sim N(\mu, \dfrac{\sigma^2}{n})Xˉ∼N(μ,nσ2)∑i=1n(Xi−Xˉ)2∼σ2χ2(n−1)\sum_{i=1}^n (X_i-\bar X)^2 \sim \sigma^2 \chi^2(n-1)∑i=1n(Xi−Xˉ)2∼σ2χ2(n−1)Xˉ\b
2021-11-26 12:30:49
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原创 随机向量的协方差
设a⃗=[a1,a2,⋯ ,an]⊤\vec a = [a_1,a_2,\cdots, a_n]^\topa=[a1,a2,⋯,an]⊤X⃗=[X1,X2,⋯ ,Xn]⊤\vec X = [X_1,X_2,\cdots, X_n]^\topX=[X1,X2,⋯,Xn]⊤b⃗=[b1,b2,⋯ ,bn]⊤\vec b = [b_1,b_2,\cdots, b_n]^\topb=[b1,b2,⋯,bn]⊤Y⃗=[Y1,Y2,⋯ ,Yn]⊤\vec Y = [Y_1,Y_2,\cdots
2021-11-12 14:41:50
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原创 CS seminar exercise template in latex
\documentclass[addpoints,UTF8]{exam}\usepackage[fontset=windows]{ctex} % Chinese support\usepackage{zhnumber} % Chinese number support\usepackage{amsmath} % Math formula support\usepackage{listings} % Code s
2021-10-19 00:22:33
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原创 numpy数值计算实例
∑i=−5050∑j=−5050∑k=−50501i2+j2+k2−0.25\sum_{i=-50}^{50}\sum_{j=-50}^{50}\sum_{k=-50}^{50}\frac{1}{i^2+j^2+k^2-0.25}i=−50∑50j=−50∑50k=−50∑50i2+j2+k2−0.251代码：import numpy as npk = 50N = 2*k+1n1 = np.arange(-k, k+1, 1)n1 = np.tile(n1[:, np.newaxis
2021-10-17 22:46:33
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原创 文件批量重命名
去除文件名中的"PNG"：ls | while read f; do mv "$f" "$(echo $f | sed 's/PNG//g')"; done重命名为顺序数字：ls -v | cat -n | while read n f; do mv -n "$f" "$n.ext"; done ls | cat -n | while read n f; do mv "$f" `printf "%04d.ext" $n`; done # with leading zerosnum=0; f
2021-10-14 15:14:11
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原创 c++ move
考虑一个场景：#include <iostream>#include <cstring>class String{private: char *m_Data; unsigned m_Size;public: String(); String(const char* p) { m_Size = strlen(p)+1; m_Data = new char[m_Size]; memcpy
2021-08-11 17:14:54
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原创 C++高阶语法
lvalue & rvaluervalue举例#include <string>using namespace std;int getValue(){ return 100;}int main(){ int a = 10; int b = getValue(); string firstname = "Wu"; string lastname = "Jun"; string fullname = firstname + lastname;}这段代码中
2021-08-11 15:20:38
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原创 shell总结
列出子文件夹中所有文件的扩展名find . -type f | perl -ne 'print $1 if m/\.([^.\/]+)$/' | sort -u
2021-07-06 19:47:36
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转载 How to Fix ‘E: Could not get lock /var/lib/dpkg/lock’ Error in Ubuntu Linux
https://itsfoss.com/could-not-get-lock-error/
2021-06-12 12:15:34
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转载 Run a command that is shadowed by an alias
You can also prefix a back slash to disable the alias: \lsEdit: Other ways of doing the same include:Use “command”: command ls as per Mikel.Use the full path: /bin/ls as per uther.Quote the command: “ls” or ‘ls’ as per Mikel comment.You can remove th.
2021-06-08 22:16:12
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原创 Implement Divison
#include "stdio.h"// 16-bit integerint divisor = 3;int reminder = 17; // also the dividendint quotient = 0;void divide(){ divisor <<= 15; for (int i = 0; i < 16; ++i) { if ((reminder -= divisor) >= 0) { quoti
2021-06-03 11:42:08
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原创 Xilinx FPGA编程备忘录
按键布局 U LCR Dup-down-left-right-center用iverilog检查语法错误iverilog -o a.vpp <tb file> <dependency files>if [ $? -eq 0 ]; then vvp a.vppfi用Vivado debug右键*_tb.v文件，点击Set as Top点击Run Simulation如需添加新的变量，参考这里；如需删除，选中相应变量后按delete即可多选左侧
2021-05-27 17:50:39
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原创 解决：pip is configured with locations that require TLS/SSL, howeve......
pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available问题是OpenSSL版本过低或未安装解决方法：到OpenSSL官网下载Win64 OpenSSL Light安装后pip恢复正常参考：https://blog.csdn.net/wbj_code_life/article/details/97887891...
2021-04-24 15:22:20
307
原创 win10下删除linux双系统
下载并安装EFI管理工具EasyUEFI，试用版就够用了备份EFI启动项。依次点击：管理EFI启动项——其他操作——备份3. 删除ubuntu启动项4. 打开磁盘管理器，删除ubuntu分区
2021-04-15 20:32:02
364
原创 vscode下运行matlab程序
用到三个扩展程序：Matlab：代码高亮、语法检查、用户片段matlab-formatter：代码格式化Matlab Interactive Terminal：集成终端Matlab在settings.json中做如下配置： "files.associations": {"*.m": "matlab"}, "[matlab]": { "files.encoding": "gb2312" }, "matlab.matlabpath": "C:\\Program Files\\MATLA
2021-04-10 18:04:47
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原创 最小二乘法的数学解释
我们做出如下假设：y(i)=θ⊤x(i)+ϵ(i)y^{(i)}=\theta^\top x^{(i)} + \epsilon^{(i)}y(i)=θ⊤x(i)+ϵ(i)其中ϵ(i)∼N(0,σ2)\epsilon^{(i)} \sim N(0, \sigma^2)ϵ(i)∼N(0,σ2)亦即P(ϵ(i))=12πσexp(−(ϵ(i))22σ2)P(\epsilon^{(i)}) = \dfrac{1}{\sqrt{2\pi}\sigma} \exp \left(-\dfrac{(\epsil
2021-04-03 23:47:56
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转载 pipdeptree 查看Python包之间的依赖关系
# 安装pip install pipdeptree -i http://mirrors.aliyun.com/pypi/simple/ # 帮助信息pipdeptree --help# 查看pipdeptree的依赖包pipdeptree -p pipdeptree # 查看哪些包依赖pipdeptreepipdeptree -p pipdeptree -r
2021-04-01 09:59:56
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原创 matlab基础语法
size(matrix)：查看矩阵各维度长度permute(matrix, dimorder)：按照dimorder重排各个维度，与reshape不同reshape(matrix, newshape)：按照newshape改变矩阵的形状
2021-03-11 21:36:30
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原创 从google drive上下载大文件
前提：有一个翻墙软件直接从网页下载慢且容易断线，从客户端下载就好很多安装google drive for desktop：链接
2021-03-10 11:11:40
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原创 make a PR on github
首先进入作者的repository，点击Fork，克隆出一个属于自己的repository，在其中的任何修改不会影响作者的repository复制自己的repository链接，并下载git clone <link>进入目标文件夹后，新建一个分支并命名git checkout -b <branch name>修改文件git add <modified files name>git commit -m "explain what y..
2021-03-09 22:18:27
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原创 手动实现keras.utils.to_categorical
def to_categorical_1d(train_labels): ret = np.zeros((len(train_labels), train_labels.max()+1)) ret[np.arange(len(ret)), train_labels] = 1 return reta = np.array([5, 0, 4, 1, 9, 2, 1, 3, 1, 4])R = to_categorical_1d(a)print(a)print(R)[5 0
2021-03-07 15:12:01
134
原创 jupyterlab基础配置
修改conda的default working directory命令行输入jupyter lab --generate-config，效果为在C:\Users\<username>\.jupyter下创建配置文件jupyter_notebook_config.py修改该文件中的c.ServerApp.root_dir条目为想要的工作目录即可interactive matplotlib参考conda install -y nodejspip install ipympljup
2021-03-06 20:34:59
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原创 求解argmin |Ax|
问题：给定矩阵 AAA, 求解x0=arg minx∥Ax∥\boldsymbol{x_0} = \argmin_\boldsymbol{x}\|A\boldsymbol{x}\|x0=xargmin∥Ax∥解：∥Ax∥2=∥UDV⊤x∥2=∥DV⊤x∥2=∥y∥=1y=V⊤x∥Dy∥2=(σ1y1+⋯+σryr)2≥σr2\begin{aligned}\|Ax\|^2 & = \|UDV^\top x\|^2 \\ & = \|DV^\top x\|^2 \\&a
2021-03-03 21:57:42
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原创 ubuntu的conda虚拟环境下安装OpenEXR
安装依赖环境：sudo apt install libopenexr-devpip install openexr如果是在conda虚拟环境下安装，可能会报链接错误：解决方法非常暴力，直接把库拷贝到虚拟环境下：cd ~/miniconda3/envs/<env_name>/libcp /usr/lib/x86_64-linux-gnu/libIex* .cp /usr/lib/x86_64-linux-gnu/libImath* .cp /usr/lib/x86_64-lin.
2021-03-03 16:25:14
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原创 image downsampling in python
1 适用于灰度图像或者三通道图像的降采样def downsampling(img, k): """ Down-sample an image of shape (h, w) into an image of shape(h/k, w/k), by averaging every k*k elements. img: an image of 2D or 3D k: edge length of the kernel Can apply t
2021-03-02 01:22:07
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原创 dcraw使用小结
查看照片信息：dcraw -i -v [image]color options-w: use the white balance specified by camera-o 1: specify output color space as sRGBinterpolation options-q 3: interpolation with highest quality-d/D/E: no interpolationoutput options-4: linear 16 bit-T: w
2021-03-01 11:47:49
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