1970-01-01

Managing conda environments

Method 1

1	conda activate <environment_name>

1	vi $(dirname $(which python))/../etc/conda/activate.d/env_vars.sh

#!/bin/bash

export OLD_PATH=$PATH
export PATH=***:$PATH

1	vi $(dirname $(which conda))/../etc/conda/deactivate.d/env_vars.sh

#!/bin/bash

export PATH=$OLD_PATH
unset OLD_PATH

Method 2 (didn’t test)

conda activate <environment_name>
conda env config vars set <variable_name>=<value>
conda env config vars set <variable_name>=<value>
...
conda env config vars set <variable_name>=<value>
conda env export --no-builds > environment.yml
conda deactivate

1970-01-01

codesign

codesign -s Zihan --deep --force .

the Zihan is from Zihan.cer

1970-01-01

debug matlab mex on linux

mex it

An example: ELSDc
src/mexall.m
-g for debug, -l for function dsyev

debug

su to act as a root
code --no-sandbox ----user-data-dir /home/zihanwu7/tmp
install LLDB extention
use attach form

{
    // 使用 IntelliSense 以得知可用的屬性。
    // 暫留以檢視現有屬性的描述。
    // 如需詳細資訊，請瀏覽: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "type": "lldb",
            "request": "attach",
            "name": "Attach",
            "pid": "${command:pickMyProcess}"
        }
    ]
}

matlab -nosplash -nodesktop -debug
attach it and enjoy debugging!

1970-01-01

answer

Suppose $\sum_{i\in X} x_i$ is convergent, which means $|a - \sum_{i\in \Omega’} x_i| < \epsilon$ for any finite subset $\Omega \subset \Omega’ \subset X$.

Consider $\sum_{i\in X} |x_i|$,

$\forall \epsilon > 0$, since $\sum_{i\in X} x_i$ is convergent, there exists a finite subset $\Omega \subset X$ such that $|a - \sum_{i\in \Omega’} x_i| < \epsilon$ for any finite subset $\Omega \subset \Omega’ \subset X$.

Note $b = \sum_{i\in \Omega} |x_i|$, then

Consider

$$
\begin{align}
f: \omega &\mapsto \sum_{i\in \omega} x_i \
g: \omega &\mapsto \sum_{i\in \omega} |x_i| \
{\Omega’ \setminus \Omega &| \Omega \subset \Omega’ \subset X} \to \mathbb{R} \
\end{align}
$$

And since ${x_i}$ is given, $X \setminus \Omega$ can be divided into two subsets $X_1$ and $X_2$ such that $x_i \ge 0$ for $i \in X_1$ and $x_i < 0$ for $i \in X_2$.

Then define

$$
\begin{align}
f_+: \omega &\mapsto \sum_{i\in \omega \cap X_1} x_i \
f_-: \omega &\mapsto \sum_{i\in \omega \cap X_2} |x_i| \
\end{align}
$$

Then $f = f_+ - f_-$ and $g = f_+ + f_-$.

Then one can prove $\sup(2f) \ge \sup(g)$. And then verify

$$
\begin{align}
|b - \sup(g)| < 2\epsilon
\end{align}
$$

Notice: the $b$ part is wrong, since $b$ should not depend on $\Omega$.

1970-01-01

Hugging Face Dataset

This notebook explores the Hugging Face dataset library.

Introduction

The Hugging Face dataset library is a powerful tool for working with various datasets in natural language processing (NLP) tasks. It provides a wide range of preprocessed datasets that can be easily loaded and used for training and evaluation.

Installation

To use the Hugging Face dataset library, you need to install it first. You can install it using pip:

1	pip install datasets

set cache dir

1	export HF_DATASETS_CACHE=/your/path/to/cache

1970-01-01

Using ifthen package in LaTeX

\RequirePackage{ifthen}
...
\newcommand{\mytitle}[2][maintex]{%
    \ifthenelse{\equal{#1}{maintex}}{%
        % Fixed style for the title
        \title{%
            % Top rule
            \rule{\textwidth}{0.4pt} \\
            \vspace{0.5cm}
            \textbf{\uppercase{#2}} % Title content as argument
            % Bottom rule
            \rule{\textwidth}{0.4pt}
        }
    }{%
        % Alternative style for the title
        \title{\textbf{\large #2}}
    }
}

The above code defines a command \mytitle that takes two arguments, the first one is optional and the second one is mandatory. The first argument is used to switch between two styles for the title. The second argument is the title content. There is a default value for the first argument, which is maintex. If the first argument is maintex, the title will be styled as a horizontal rule with the title content in uppercase. Otherwise, the title will be styled as a bold text with the title content in large font size.

1970-01-01

install vscode without sudo

wget https://az764295.vo.msecnd.net/stable/6445d93c81ebe42c4cbd7a60712e0b17d9463e97/vscode_cli_alpine_x64_cli.tar.gz
tar -xf vscode_cli_alpine_x64_cli.tar.gz

1970-01-01

Hello World

Welcome to Hexo! This is your very first post. Check documentation for more info. If you get any problems when using Hexo, you can find the answer in troubleshooting or you can ask me on GitHub.

Quick Start

Create a new post

1	$ hexo new "My New Post"

More info: Writing

Run server

1	$ hexo server

More info: Server

Generate static files

1	$ hexo generate

More info: Generating

Deploy to remote sites

1	$ hexo deploy

More info: Deployment

1970-01-01

Open VPN

install docker
Note: check if daemon is running
1
sudo systemctl status docker

install openvpn

OVPN_DATA="ovpn-zihan"
docker volume create --name $OVPN_DATA
docker run -v $OVPN_DATA:/etc/openvpn --rm kylemanna/openvpn ovpn_genconfig -u udp://vpn.zihanng.shop
docker run -v $OVPN_DATA:/etc/openvpn --rm -it kylemanna/openvpn ovpn_initpki
docker run -v $OVPN_DATA:/etc/openvpn -d -p 1194:1194/udp --cap-add=NET_ADMIN kylemanna/openvpn
# or
# docker run --privileged -v $OVPN_DATA:/etc/openvpn -d -p 1194:1194/udp kylemanna/openvpn
docker run -v $OVPN_DATA:/etc/openvpn --rm -it kylemanna/openvpn easyrsa build-client-full zihan nopass
docker run -v $OVPN_DATA:/etc/openvpn --rm kylemanna/openvpn ovpn_getclient zihan > zihan.ovpn

pull the zihan.ovpn file to local machine
1
rsync -avzP zihan_aws:zihan.ovpn .

1970-01-01

Linux solve `policykit-1.service`

Linux solve `policykit-1.service: Two services allocated for the same bus name org.freedesktop.PolicyKit1, refusing operation.`

1	sudo systemctl mask --now polkit.service

sudo systemctl unmask polkit.service

sudo apt install libpolkit-qt5-1-1

sudo apt-get install -y meson ninja-build

sudo apt-get install libglib2.0-dev

sudo apt-get install libexpat1-dev

sudo apt-get install duktape-dev

sudo apt-get install libpam0g-dev

sudo apt-get install libgirepository1.0-dev

sudo apt-get install libdbus-1-dev

Try

/etc/dbus-1/system.d/org.freedesktop.PolicyKit1.conf > /etc/dbus-1/system.d/org.freedesktop.PolicyKit1.conf_old
/usr/share/dbus-1/system.d/org.freedesktop.PolicyKit1.conf > /usr/share/dbus-1/system.d/org.freedesktop.PolicyKit1.conf_old
sudo cp /etc/dbus-1/system.d/org.freedesktop.PolicyKit1.conf /etc/dbus-1/system.d/org.freedesktop.PolicyKit1.conf_old
sudo cp /usr/share/dbus-1/system.d/org.freedesktop.PolicyKit1.conf /etc/dbus-1/system.d/org.freedesktop.PolicyKit1.conf

Try 2

root@zihanwu7-Precision-3630-Tower:/usr/lib/systemd/system# mv policykit-1.service policykit-1.service_bak
/usr/lib/systemd/system/polkit.service:7:BusName=org.freedesktop.PolicyKit1

Managing conda environments

Method 1

Method 2 (didn’t test)

codesign

debug matlab mex on linux

mex it

debug

answer

Hugging Face Dataset

Introduction

Installation

set cache dir

Using ifthen package in LaTeX

install vscode without sudo

Quick Start

Create a new post

Run server

Generate static files

Deploy to remote sites

Open VPN

Linux solve policykit-1.service: Two services allocated for the same bus name org.freedesktop.PolicyKit1, refusing operation.

Try

Try 2

Linux solve `policykit-1.service: Two services allocated for the same bus name org.freedesktop.PolicyKit1, refusing operation.`