Converting item-list prediction to original item-id in the ETL work.

[swapnilpanda]

I have been going through the example end-to-end prediction on transformer4rec, in the ETL notebook the item-id was shown in 6 digits,

however in the inference part, the item-id list we got had the item-id in 1 to 4 digit.

How do I track back to the original item-id so that I can actually make the inference and check my results?
In other words, how is the item id before and after transformation are mapped?
Any help will be appreciated, thanks.