Table 2. Number of (un)shared parameters of each model

	(A) Retailer S	(B) Retailer L	(C) Grocery S	(D) Grocery L
Vocabulary size	2,138	2,160	8,765	9,521
#Total parameters	1,702,490	1,710,960	4,253,885	4,544,945
#Shared parameters	879,360
Encoder layer	406,528
Decoder layer	472,832
#Unshared parameters	823,130	831,600	3,374,525	3,665,585
Encoder embedding layer	273,664	276,480	1,121,920	1,218,688
Decoder embedding layer	273,664	276,480	1,121,920	1,218,688
Output layer	275,802	278,640	1,130,685	1,228,209