Table 2 Some statistics of experimental materials, including the mean and standard deviation in each °Brix interval of samples and the sample numbers of training, validation, and test sets in each data type and spectral range. STD denotes the standard deviation of °Brix values.

Data Type	Spectral range (nm)	Size (W × L × Λ)	Groups			Number of samples
Data Type	Spectral range (nm)	Size (W × L × Λ)	°Brix interval	Mean	STD	Train	Valid	Test	Total
3-D data	400–1700	20 × 20 × 261	[00,10]	8.65	0.82	131	44	43	218
			[10,11]	10.44	0.25	97	33	32	162
			[11,12]	11.48	0.23	131	44	43	218
			[12,13]	12.52	0.27	131	44	43	218
			[13,17]	14.01	0.88	131	44	43	218
	400–1000	20 × 20 × 121	[00,10]	8.65,	0.82	131	44	43	218
			[10,11]	10.44	0.25	97	33	32	162
			[11,12]	11.48	0.23	131	44	43	218
			[12,13]	12.52	0.27	131	44	43	218
			[13,17]	14.01	0.88	131	44	43	218
	400–700	20 × 20 × 61	[00,10]	8.65	0.82	97	33	32	218
			[10,11]	10.44	0.25	131	44	43	162
			[11,12]	11.48	0.23	131	44	43	218
			[12,13]	12.52	0.27	131	44	43	218
			[13,17]	14.01	0.88	131	44	43	218
	900–1700	20 × 20 × 161	[00,10]	8.65	0.82	97	33	32	218
			[10,11]	10.44	0.25	131	44	43	162
			[11,12]	11.48	0.23	131	44	43	218
			[12,13]	12.52	0.27	131	44	43	218
			[13,17]	14.01	0.88	131	44	43	218
1-D data	400–1700	1 × 261	[00,10]	8.65	0.82	131	44	43	218
			[10,11]	10.44	0.25	97	33	32	162
			[11,12]	11.48	0.23	131	44	43	218
			[12,13]	12.52	0.27	131	44	43	218
			[13,17]	14.01	0.88	131	44	43	218
	400–1000	1 × 121	[00,10]	8.65	0.82	131	44	43	218
			[10,11]	10.44	0.25	97	33	32	162
			[11,12]	11.48	0.23	131	44	43	218
			[12,13]	12.52	0.27	131	44	43	218
			[13,17]	14.01	0.88	131	44	43	218
	400–700	1 × 61	[00,10]	8.65	0.82	131	44	43	218
			[10,11]	10.4	0.25	97	33	32	162
			[11,12]	11.48	0.23	131	44	43	218
			[12,13]	12.52	0.27	131	44	43	218
			[13,17]	14.01	0.88	131	44	43	218
	900–1700	1 × 161	[00,10]	8.65	0.82	131	44	43	218
			[10,11]	10.44	0.25	97	33	32	162
			[11,12]	11.48	0.23	131	44	43	218
			[12,13]	12.52	0.27	131	44	43	218
			[13,17]	14.01	0.88	131	44	43	218

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