[Question] How does a session start and end? about recbole

[ShanleiMu]

• Q1
  I think you can generate a field called session_id in your inter atomic file to indicate which session this interaction belongs to. And in each session, the sequence order is dependent on timestamp.
  Then you can write something like these in your config file to load the data.

USER_ID_FIELD: session_id
load_col:
  inter: [session_id, item_id, number of times, timestamp]

• Should each user id appear only once?
  The same user id can appear in different sessions.

[mayaKaplansky]

Thanks, and GRU4rec will know to use the session-id field as the session without any further indication?

[ShanleiMu]

Thanks, and GRU4rec will know to use the session-id field as the session without any further indication?

Yes, it is.

[mayaKaplansky]

Thanks, so in case I have a 'session_id' column, then its OK to have the time stamps repeatable between sessions, since the GRU4Rec will take the 'session_id' as the session key anyway?

[mayaKaplansky]

Hi
as for this:
USER_ID_FIELD: session_id
load_col:
inter: [session_id, item_id, number of times, timestamp]

So now I understand that by indicating that the user id field is actually the session id, that's how GRU4Rec will know how to use it?

what is "number of times" - is this an example for an inter feature? should I indicate here all my additional columns of inter?

[ShanleiMu]

Thanks, so in case I have a 'session_id' column, then its OK to have the time stamps repeatable between sessions, since the GRU4Rec will take the 'session_id' as the session key anyway?

Yes

[ShanleiMu]

Hi
as for this:
USER_ID_FIELD: session_id
load_col:
inter: [session_id, item_id, number of times, timestamp]

So now I understand that by indicating that the user id field is actually the session id, that's how GRU4Rec will know how to use it?

what is "number of times" - is this an example for an inter feature? should I indicate here all my additional columns of inter?

Your understanding is correct.

number of times is an example for an inter feature.

You only need to indicate the used features in load_col (e.g. the feature used for filtering dataset, the feature used in the model).

[mayaKaplansky]

Hi according to our thread, I only need to change the USER_ID_FIELD and load_col:.
But according to this: #608 I need to change additional parameters and add my inter features as list items as well. Which one should I follow?
Many thanks!!