The "aidge compare" feature does not work anymore

Problem description

aidge_cmp is an option which may be enabled while running example export files (lenet.py, resnet18.py, etc.) It allows to export a reference for the output of each layer, based on the inference done with the aidge_backend_cpu and is quite usefull for validation and/or debug. Due to recent changes (mainly the add of AdaptToBackend) this feature does not work anymore.