[ML] logistic gradient accent and Andrew Ng gradient decent

ref:

http://www.csdn123.com/html/topnews201408/66/10366.htm


the gradient fun is l(n)

normally hope probability biggest, so use gradient Accent to find largest theta of l(n)

but

Andrew Ng set J(theta)=-(1/m)l(n), there has a "-", so become find the minimum , so
use gradient decent.

[python3.x] UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position

Can't fix by root cause, but I try another way, reedit the file you hit.

1. open that file in vim, and you can see the  <0x92> in the file, remove and save. Done.
2. simply open file in sublime text 3 or TextEdit something, find some strange mark. remove it. Done.

ps. if you wondering what is the encoding of your file, go to sublime , show console and
     type-> view.encoding()

[mac] add path for adb,fastboot,.... to PATH

get mac version of adb , fastboot....

=> download Android Studio from google developer site.


copy those bin to folder whether you want.  ex: /Users/xxxxx/Documents/bin

and

vim ~/.bash_profile

PATH="/Library/Frameworks/Python.framework/Versions/3.4/bin:/Users/xxxxx/Documents/bin:${PATH}"

export PATH

save , and reopen the terminal.

Done.

[mac] Connect FTP from mac to ubuntu by vsftpd

[ubuntu side]

sudo apt-get install vsftpd



[mac side]

download filezilla client.

create a new ftp , use account and password to login.



ref:
http://yunol.com.tw/phpbb3/viewtopic.php?f=15&t=25132

[IDE]Sublime text 3 + Anconda ST3 => Autocomplete pandas dataframe setting

add following in to

Preferences->Setting-User

{

"auto_complete_triggers":
[
   {
       "characters": ".",
       "selector": "source"
   }
],
}

Preferences -> Package setting->Anconda->Setting-User

add at the tail.

{


    "anaconda_linting": false,
    "python_interpreter": "/Library/Frameworks/Python.framework/Versions/3.4/bin/python3",
    "auto_python_builder_enabled": false,
}

[IDE] Sublime text 3 + Anconda ,autocomplete quickly config

Sublime Text → Preferences → Settings—User

"auto_complete_triggers":
[
    {
        "characters": ".",
        "selector": "source"
    }
],

[MacOS] install python3.4 pandas , request, matplotlib

pip3.4 install pandas
pip3.4 install request
pip3.4 install matplotlib



SUPER EASY.....