For training and testing, your directory structure should look like this
Datasets
ββββtrain
ββββββββDFWB
ββββββββSIDD
βββββββββββββinput_crops
βββββββββββββtarget_crops
ββββval
ββββββββSIDD
βββββββββββββinput_crops
βββββββββββββtarget_crops
ββββtest
ββββββββBSD68
ββββββββCBSD68
ββββββββKodak
ββββββββMcMaster
ββββββββSet12
ββββββββUrban100
ββββββββSIDD
βββββββββββββValidationNoisyBlocksSrgb.mat
βββββββββββββValidationGtBlocksSrgb.mat
ββββββββDND
βββββββββββββinfo.mat
βββββββββββββimages_srgb
ββββββββββββββββββ0001.mat
ββββββββββββββββββ0002.mat
ββββββββββββββββββ ...
ββββββββββββββββββ0050.mat