fix vol4 function

notebooks/5.0-hfk-comparing-to-traditional.ipynb

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:a829621748900e51414539750910d6a7043e026698286a5009d4d9149e804866
-size 26295
+oid sha256:a72d81240eb43d09e8fb55c2c58331e083050f35d99a150044cd4296953f4c30
+size 26285

src/models/focus_traditional.py

@@ -12,7 +12,7 @@ import kornia
 
 def vol4(img):
     img_grey = torch.mean(img, dim=0)
-    return torch.sum(torch.mul(img_grey[:-1, :], img_grey[1:, :])) - torch.sum(
+    return 100 / torch.sum(torch.mul(img_grey[:-1, :], img_grey[1:, :])) - torch.sum(
         torch.mul(img_grey[:-2, :], img_grey[2:, :])
     )