Label transformation problem (0, 1, 2, 4 to 0, 1, 2, 3)

[Yinaysa]

Dear author,
I would like to know that the labels of the brain tumor dataset are discontinuous 0, 1, 2, 4. Where did you perform the step of converting label 4 to label 3? Can the Loss be evaluated without conversion?
Looking forward to your reply!