What is the meaning behind different numbers I get in targets column

[matheesha]

Hello,

I am interested in URL multi-label classification and found this repo interesting. When I ran the script, I get numbers in the target column like below.
[381, 622, 933, 935, 1343]
[381, 931, 933, 1343, 1828]
[16, 215]
[353, 785, 1071, 1533, 1534]
[353, 785, 1071, 1533, 1534]
[16, 215]

Is this just a collection of index numbers for words present in the given URL or does this has a meaning, where I can take each number as a label for URL category. If so what is the interpretation for each category.

Thanks
Matheesha