Table 9.

Time costs and R²'s values of the FCNN with different hidden layers (Hubei Province).

Round	One hidden layer			Two hidden layers			Three hidden layers
	time cost (s)	R2	iterative times	time cost (s)	R2	iterative times	time cost (s)	R2	iterative times
1	1.015058279037	0.997261077554	54	4.885279417038	0.997264302890	62	6.404366493225	0.997843871621	45
2	1.593091249466	0.997329635866	83	2.044116973877	0.997247814956	32	5.221298694611	0.997389485505	32
3	1.648094415665	0.997728075733	88	4.303246021271	0.997494009135	69	4.407252073288	0.997243617456	29
4	0.780044555664	0.997264757155	42	2.623149871826	0.997599630230	42	7.518430233002	0.997296620534	48
5	0.866049528122	0.997286638882	47	1.478084325790	0.997298756493	18	2.729156017303	0.997505670594	18
6	0.888050556183	0.997315886077	46	3.947225570679	0.997601446457	48	8.178467512131	0.997255979564	59
7	0.764043807983	0.997259507986	41	4.955283641815	0.997289058655	76	6.990399599075	0.997251829888	48
8	0.539030790329	0.997326885294	32	2.292131185532	0.997254575125	38	14.435825586319	0.997385497122	104
9	1.111063480377	0.997489166385	62	3.241185426712	0.997222436457	46	6.752386331558	0.997250216439	45
10	0.898051261902	0.997503101089	49	2.978170394897	0.997381075836	41	7.431424856186	0.997251588475	53
Average	1.010257792473	0.997376473202	54	3.274787282944	0.997365310623	47	7.006900739670	0.997367437720	48