read_params应该从ocr_det而不是ocr_system中导入

add reference for locality_aware_nms

[cherry-pick 4552] add reference

[CP 4551 and 4555]add refer for some code

[fix infer] cp 

[cherry-pick] fix attn score

add nrtr reference

charry pick nrtr_postprocess and modify data type to adaptive

Update utility.py

Added other image formats that are already verified by imghdr.
Not sure about "pgm" format?

更正链接指向

pick fix nrtr export inference model from drgraph to release/2.3

update cpp infer docs in Release/2.3