dependency: 
sudo pip install requests==2.3.0
sudo pip install logutils
sudo pip install pymysql
sudo pip install python-hashes

1. configure.py: set basic parameters in the file
2. scanner.py: prob+webpage feteching
3. feature.py: feature extractor
4. clus_top.py: top-level clusters
5. clus_sub.py: get the final clustering results.