Refactor tests for processing and adapt it to new library structure, plus fix...

Refactor tests for processing and adapt it to new library structure, plus fix unit tests for processing

qim3d/ml/models/_unet.py

@@ -2,7 +2,7 @@
 
 import torch.nn as nn
 
-from qim3d.utils._logger import log
+from qim3d.utils import log
 
 
 class UNet(nn.Module):