Prod Features (20 after encoding):
3. style         0:maki      1:otherwise (see Wikipedia)
4. major group   0:seafood   1:otherwise
   0 corresponds to the minor group nos 0--8.
5. minor group
    0:aomono (blue-skinned fish)
    1:akami (red meat fish)
    2:shiromi (white-meat fish)
    3:tare (something like baste; for eel or sea eel)
    4:clam or shell
    5:squid or octopus
    6:shrimp or crab
    7:roe
    8:other seafood
    9:egg
   10:meat other than fish
   11:vegetables
6. the heaviness/oiliness in taste, range[0-4] 0:heavy/oily
7. how frequently the user eats the SUSHI, range[0-3] 3:frequently eat
8. normalized price
9. how frequently the SUSHI is sold in sushi shop, range[0-1] 1:the most frequently

- features 3-5 are categorical, and features 6-9 are numerical
Customer features (21 after encoding):
2.  gender   0:male 1:female
3.  age      0:15-19  1:20-29   2:30-39   3:40-49   4:50-59    5:60-
4.  the total time need to fill questionnaire form
6.  region ID at which you have been the most longly lived until 15 years old
7.  east/west ID at which you have been the most longly lived until 15 years old
9.  regional ID at which you currently live
10. east/west ID at which you currently live
11. 0 if features 5 and 8 are equal; 1 otherwise
 