Complex Texture Contour Feature Extraction of Cracks in Timber Structures of Ancient Architecture Based on YOLO Algorithm

Table 5

YOLO v4 training results.

Epoch	Gpu_men	Box	Obj	Cls	Total	Labels	Img_size	Precision	Recall	mAP@0.5
0/449	1.32 G	0.1295	0.0752	0	0.2048	24	640	0	0	0.0008
1/449	1.35 G	0.1162	0.0814	0	0.1977	22	640	0	0	0.0052
2/449	1.35 G	0.2085	0.0862	0	0.1927	13	640	0.1217	0.0418	0.0175
3/449	1.35 G	0.1026	0.0893	0	0.1920	62	640	0.0893	0.2780	0.0786
4/449	1.35 G	0.0973	0.0923	0	0.1896	3	640	0.0984	0.2868	0.0769
445/449	1.36 G	0.0417	0.0417	0	0.0997	11	640	0.5950	0.8913	0.8812
446/449	1.36 G	0.0426	0.0426	0	0.1052	15	640	0.5813	0.8941	0.8815
447/449	1.36 G	0.0420	0.0420	0	0.1022	56	640	0.5933	0.8909	0.8823
448/449	1.36 G	0.0434	0.0434	0	0.1043	106	640	0.6014	0.8809	0.8817
449/449	1.36 G	0.0423	0.0423	0	0.1032	29	640	0.5910	0.8921	0.8823