Table 1.

Overview of the training and test sets (Transactions = Txn).

	Training set		Test set
Overview	Oct.’18–Jul.’19	Nov.’18–Aug.’19	Aug.’19	Sep.’19
# of txn.	1,3 M	1,4 M	20,2 M	21,3 M
# of cards	31,158	49,002	3 M	3,1 M
# of fraud txn.	61,130	52,610	6,767	7,045
# of fraud cards	15,579	24,501	3,626	3,997