yes opencv do not have NN model
can opencv use NN model from  pytorch?  or do not need to export , just import pytorch library , directly use with opencv?
no, not want to convert images
if opencv2 can use NN model from pytorch, is there any requirement to manipulate the photo in real practice?
as i find pytorch example and mnist 's image have been compressed in another format, i do not know which
treatment have to do before using NN model in pytorch