[trainers] fixed stuff on CNNTrainer, to be able to load model saved on both...

[trainers] fixed stuff on CNNTrainer, to be able to load model saved on both CPU/GPU on both CPU/GPU
2 jobs for add-fargo-dataset in 10 minutes and 49 seconds (queued for 1 second)
Status Job ID Name Coverage
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passed #155943
docker
build_linux_36

00:08:55

68.0%
passed #155944
macosx
build_macosx_36

00:01:54