https://kevinlin91.github.io/2017_11_30_DM_Sinica/data_mining/clustering/Clustering.slides.html
https://kevinlin91.github.io/2017_11_30_DM_Sinica/social_network/Networkx.slides.html
https://www.kaggle.com/datasets
https://webscope.sandbox.yahoo.com
https://snap.stanford.edu/data/
http://jmcauley.ucsd.edu/data/amazon/
https://www.data.gov/