1. Dmoz https://dmoz-odp.org/. Dmoz https://dmoz-odp.org/.
2. Google vision api https://cloud.google.com/vision. Google vision api https://cloud.google.com/vision.
3. Scikit-learn https://scikit-learn.org/stable/modules/clustering.html. Scikit-learn https://scikit-learn.org/stable/modules/clustering.html.
4. World cities database https://simplemaps.com/data/world-cities. World cities database https://simplemaps.com/data/world-cities.
5. Raghavendra Addanki , Sainyam Galhotra , and Barna Saha . How to design robust algorithms using noisy comparison oracle. arXiv preprint arXiv:2105.05782 , 2021 . Raghavendra Addanki, Sainyam Galhotra, and Barna Saha. How to design robust algorithms using noisy comparison oracle. arXiv preprint arXiv:2105.05782, 2021.