1. Hotel dataset. https://www.hotels-base.com. Hotel dataset. https://www.hotels-base.com.
2. House dataset. https://www.ipums.org. House dataset. https://www.ipums.org.
3. NBA dataset. https://www.basketball-reference.com. NBA dataset. https://www.basketball-reference.com.
4. ORD and ORU implementation. https://github.com/ghlkm/ordu. ORD and ORU implementation. https://github.com/ghlkm/ordu.
5. TripAdvisor dataset. https://www.cs.virginia.edu/~hw5x/dataset.html. TripAdvisor dataset. https://www.cs.virginia.edu/~hw5x/dataset.html.