The image is size [3, H, W], there are a total 63 classes.
IF there are 5 objects in the image, labels are size , bounding boxes size [5,4], masks [5,H,W]. Why do I get this error message:
IndexError: The shape of the mask  at index 0 does not match the shape of the indexed tensor [14, 63, 28, 28] at index 1
Where does 14 come from? Here’s the architecture of the model, it seems correct and it worked on other problem. I don’t understand this error at all.