Unsupervised classification - (K-mean clustering)

K-mean clustering: 

1. https://www.youtube.com/watch?v=hDmNF9JG3lo (Andew ng course booss *******) (13.1-13.5) 13week
2. https://towardsdatascience.com/k-means-clustering-algorithm-applications-evaluation-methods-and-drawbacks-aa03e644b48a
3.  https://www.youtube.com/watch?v=9991JlKnFmk (*** good to see for batter understanding)
4. https://www.youtube.com/watch?v=i7dFu1bPogc ( *** show some disadvantage of k-means at the end of video) 

need to lean:

• Association Rules
• hierarchy clustering 
• k-nearest neighbors algorithm (for supervised algorithm)