Joint Optimization of Item and Pod Storage Assignment Problems with Picking Aisles’ Workload Balance in Robotic Mobile Fulfillment Systems

Table 4

Results of Gurobi and IGA for the small-scale instances.

					Gurobi		IGA
					Obj	Time (sec)	Obj	Gap (%)	Time (sec)
20	10	16	3	20	12	12.35	12	0.00	11.69
20	10	16	3	100	79	93.27	79	0.00	78.63
20	10	16	3	500	497	23913	501	0.80	2756.61
20	10	16	3	1000	1036	37163	1056	1.93	3573.97
20	10	16	3	1500	—	—	1632	—	4667.53

The bold value in Table 4 indicates the maximum Gap of IGA and Gurobi.