Can't interpret the text information and ratings matrix imported to NN
I am the author of the CDL paper.

For the mult.data file, in

63 1:2 1666:1 132:1 901:1 1537:2 8:1 9:1 912:1


63 is the number of words for this documents, 1:2 means word 1 appears twice in the document, 1666:1 means word 1666 appears once in the document, etc.

For the trainuser.dat, in

10 1631 3591 10272 14851 4662 13172 12684 5324 3595 3404


10 is the number of positive samples for this user, the rest is a list of 10 items that are related to (liked by) this user.

You can check the README file in the Datasets collection for more details on the datasets.