T표준점수

학생들 채점을 하다보니 필요한 표준점수..

http://blog.naver.com/PostView.nhn?blogId=oohyes0201&logNo=30031094911
http://archive.is/07qtY

Z-점수: 평균=0, 표준편차=1인 표준점수
        Z = (변수 - 평균) / 표준편차   <높은 점수 - 높은 성적>
        Z'= (평균 - 변수) / 표준편차    <낮은 점수 - 높은 성적>

 T-점수: 평균=50, 표준편차=10인 표준점수
        T = 10Z + 50    <높은 점수 - 높은 성적>
        T'= 10Z' + 50    <낮은 점수 - 높은 성적>

Virtualenv 환경 복사하기

On the first virtual env:

pip freeze > requirements.txt

On the second:

pip install -r requirements.txt

https://stackoverflow.com/a/11702289

process terminated with status -1 (Codeblocks)

Settings -> Environments

Terminal to launch console programs :
gnome-terminal -t $TITLE -x
인데, gnome-terminal 이 설치 안된 경우도 있음.

$ sudo apt-get install gnome-terminal

참고로 default는 다음과 같음
xterm -T $TITLE -e

햅틱스 워크샵

GNU screen 중단 (termination)

Start a new screen session

screen -S <name>

Detaching From Screen

Command: "Ctrl-a" 누른 상태에서 "d"

Reattach to Screen

단 하나의 session 만 있는 경우

screen -r

• 아래와 같이 하나 이상의 session이 있는 경우

screen -ls

6750.hello      (2018년 10월 10일 20시 40분 12초)       (Detached)
6730.working    (2018년 10월 10일 20시 31분 02초)       (Detached)

이라면,

screen -r 6730

Kill detached session

screen -S <name> -X quit

Kill all windows and terminate screen

(C-a \) 
즉, Ctrl+a 를 누르고  \를 누름

https://www.gnu.org/software/screen/manual/html_node/Quit.html#Quit

view raw Screen.md hosted with ❤ by GitHub

MEMS Microphone - INMP401 (ADMP401)

Sensor #002 - MEMS Microphone - INMP401 (ADMP401)

See more at
https://github.com/dalek7/Undergrad-2017Fall-IoT/tree/master/Processing%2BArduino/02-Serial-ADC-basic

when optimizing the cost function J

And so I find machine learning easier to think about when you have one set of tools for optimizing the cost function J, and when you're focusing on authorizing the cost function J. All you care about is finding w and b, so that J(w,b) is as small as possible. You just don't think about anything else other than reducing this.


https://www.coursera.org/lecture/deep-neural-network/other-regularization-methods-Pa53F

SimpleHTTPServer

이런게 buit-in으로 있었다니...

$ sudo python -m SimpleHTTPServer 80

Jupyter notebook from the remote client

Server (jupyter notebook 구동) :

(server)$ jupyter notebook --no-browser --port=8888

Client :

(client)$ ssh -N -f -L localhost:8888:localhost:8888 user@ipaddress of server(client)$ open -a safari http://localhost:8888

localhost:8888(로칼):localhost:8888(remote)
원격 포트를 바꾸고자할때 사용할수는 있음

예를들면
localhost:8888:localhost:8889
으로 설정하면 원격 8889를 local 8888로 (remote port 8889 to local port 8888)

Cygwin을 사용해도 됨

(client)$ ssh -N -f -L localhost:8888:localhost:8888 user@ipaddress of server

ssh 포트가 포워딩되는 경우
ssh 포트 지정하듯

ssh -N -f -L localhost:8888:localhost:8888 user@ip_address_server -p SSH_PORT_NUMBER

Token authentication 문제가 나오면 server에 접속해서
(server)$ jupyter notebook list 를 하고 보이는 토큰 키를 넣어주면 끝.

jupyter notebook에서 tensorflow 사용하기 (virtualenv)

우선 필요한것들 설치..


$ ipython kernelspec install-self --user
기본 kernel 설치

~/.local/share/jupyter/kernels$ ls
python2

$ cp -r python2 tensorflow

~/.local/share/jupyter/kernels/tensorflow$ vi kernel.json

 아래처럼 수정
~/.local/share/jupyter/kernels/tensorflow$ cat kernel.json
{
 "display_name": "tensorflow",
 "language": "python",
 "argv": [
  "/home/username/tensorflow/bin/python2.7",
  "-m",
  "ipykernel_launcher",
  "-f",
  "{connection_file}"
 ]
}

위의 /home/username/tensorflow/ 는 virtualenv로 tensorflow 설치 위치임

아래와 같이 tensorflow의 interpreter를 사용하도록 만들수 있음.  

OpenCV 3.2 in Ubuntu 16.10

OpenCV 3.2 in Ubuntu 16.10 설치기

$ sudo apt-get install build-essential checkinstall cmake git pkg-config yasm libtiff5-dev libjpeg-dev libjasper-dev libavcodec-dev libavformat-dev libswscale-dev libdc1394-22-dev libxine2-dev libv4l-dev python-dev python-numpy libtbb-dev libgtk2.0-dev libfaac-dev libmp3lame-dev libopencore-amrnb-dev libopencore-amrwb-dev libtheora-dev libvorbis-dev libxvidcore-dev x264 v4l-utils libopenexr-dev python-tk  libeigen3-dev libx264-dev
$ sudo add-apt-repository ppa:mc3man/gstffmpeg-keep
$ sudo apt-get update
$ sudo apt-get install ffmpeg
$ git clone https://github.com/opencv/opencv.git
$ git clone https://github.com/opencv/opencv_contrib.git
$ cd opencv
$ mkdir build
$ cd build
$ cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_NEW_PYTHON_SUPPORT=ON -D WITH_V4L=ON -D WITH_TBB=ON -D WITH_IPP=OFF -DOPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules  ../
$ make -j8
$ sudo make install

GLIBCXX_3.4.22 not found

문제

$ gnome-terminal &
/usr/bin/gnome-terminal.real: /home/xx/anaconda2/lib/libstdc++.so.6: version `GLIBCXX_3.4.22' not found (required by /usr/lib/x86_64-linux-gnu/libmircommon.so.6)

해결

~/anaconda2/lib$ mv -vf libstdc++.so.6 libstdc++.so.6.old
'libstdc++.so.6' -> 'libstdc++.so.6.old'
~/anaconda2/lib$ln -s /usr/lib/x86_64-linux-gnu/libstdc++.so.6 ./libstdc++.so.6

참조

https://askubuntu.com/a/764572/689555

X-11 forwarding error

X-11 forwarding error :
Segmentation fault

일부 gedit, gnome-terminal 등 application에서 발생..

환경 :
Server : Ubuntu 16.10 (Nvidia GTX 1080)

Client : Windows 7 (moba xterm) -->  문제 발생
Client : OS X Maverics 에서는 문제 없었음..

해결 :

/usr/lib/x86_64-linux-gnu$ sudo ln -s /usr/lib/nvidia-375/libGLX_indirect.so.0

참고 : https://askubuntu.com/a/796159

Ubuntu Atom editor 설치

sudo add-apt-repository ppa:webupd8team/atom
sudo apt-get update
sudo apt-get install atom

Denoising Autoencoder

Visualization of weights["h1"]
https://github.com/dalek7/DNN/blob/master/tensorflow/autoencoder/

Goldcrest Wilma

율마. 이렇게 가지런히 두니 예쁘다.

을묘사직소

단성소
https://namu.wiki/w/%EB%8B%A8%EC%84%B1%EC%86%8C

450년 전 역사의 데자뷰...
http://news.mk.co.kr/newsReadPrint_2013.php?year=2016&no=775834

Clustering by fast search and find of density peaks

Clustering by fast search and find of density peaks
by Alex Rodriguez, Alessandro Laio
http://comments.sciencemag.org/content/10.1126/science.1242072
http://conference.mipt.ru/img/conference/material-design-2014/talks/Laio-talk.pdf

thermal referral

When warm thermal stimulators are placed on the ring and index fingers of one hand, and a neutral-temperature stimulator on the middle finger, all three fingers feel warm. This illusion is known as thermal referral (TR).

See http://www.nature.com/articles/srep35286

Cataldo, Antonio, et al. "Thermal referral: evidence for a thermoceptive uniformity illusion without touch." Scientific reports 6 (2016).

Closed Form Solution of Absolute Orientation using Unit Quaternions

Horn, Berthold KP. "Closed-form solution of absolute orientation using unit quaternions." JOSA A 4.4 (1987): 629-642.

http://people.csail.mit.edu/bkph/papers/Absolute_Orientation.pdf
See Sim3Solver of ORB-SLAM2 project.

g2o sphere with optimization

See https://github.com/dalek7/Algorithms/tree/master/Optimization/g2o/g2otest-sphere for more details.