Custom transforms for special input

Hi,

I followed the tutorial on how to implement a custom ItemList (and ItemBase) which so far worked very well. However, I would like to write my own transforms so that I can use the get_transforms function as well as the usual pipeline to augment/transform my data.

Since my my inputs are datasets (one training example is a whole dataset with multiple rows and columns) I cannot use the existing classes, such as TfmPixel.

Thanks in advance for your help!
Ulf