unsupervised learning -비지도학습

출처: machine learning by andrew ng, stanford cousera lecture

수강일시: 2021.01.24 

 

supervised learning

 

reminder-by-kwan.tistory.com/86

supervised learning -지도학습

 

in supervised learning we tell the answer whether the former data is right/wrong or in some class ...so on

supervised learning

however in unsupervised learning there are no labels

we find two cluster. such as news classification

as we can see on this picture, class1 is about the new coronic getting lower and class2 is about effect of corona virus in flight industry.

 

these are the example of unsupervised learning

 

cocktail party algorithmn

 

classify different audio sources and find, separate them

written in octave

for a lot of machine learning algorithms, what we do is first prototype 

our software in Octave because software 

in Octave makes it incredibly fast 

to implement these learning algorithms.

 

Here each of these functions like for example the SVD function that stands for singular 

value decomposition; but that turns out to be a 

linear algebra routine, that is just built into Octave.

 

If you were trying to do this in C++ or Java, 

this would be many many lines of code linking complex C++ or Java libraries. 

So, you can implement this stuff as C++ or Java or Python, it's just much 

more complicated to do so in those languages.

 

www.gnu.org/software/octave/index

GNU Octave