features IDs

[AMilkov]

Is there a need the feature IDs to be unique or is it enough the combination of field + feature ID to be unique?

For example If we assume that field 1 is movie and field 2 is user and user A has ID 123 and movie B has ID 123
is this a valid row:

1:123:1 2:123:1

[CNevd]

@AMilkov the feature IDs are unique, so movie B's ID should not be 123

[AMilkov]

Thank you @CNevd !