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

 Fix docs

Fix docs

disable glog info

Fixing typos/docs

Fix a serious doc issue

fix load model