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Table 4

Feature-level fusion results of building BPNN

Part	Entrance part	Entrance lock chamber	Pipe body	Exit lock chamber	Exit part
Number of training sets	210	280	230	230	228
Number of test sets	90	98	100	99	98
Fusion results	(0.1138, 0.2437, 0.6495)	(0.0629, 0.3510, 0.5860)	(0.0460, 0.5390, 0.4150)	(0.2740, 0.1290, 0.5970)	(0.1710, 0.2730, 0.5560)

Part	Entrance part	Entrance lock chamber	Pipe body	Exit lock chamber	Exit part
Number of training sets	210	280	230	230	228
Number of test sets	90	98	100	99	98
Fusion results	(0.1138, 0.2437, 0.6495)	(0.0629, 0.3510, 0.5860)	(0.0460, 0.5390, 0.4150)	(0.2740, 0.1290, 0.5970)	(0.1710, 0.2730, 0.5560)