Missing function definition for crop

[msschwartz21]

01_segmentation/local.py

Line 222 in c706cc8

y = crop(y, prediction)

A student found this but when trying to set number of output channels to 2 in exercise 2. Seems like it's just a missing import.

[cmalinmayor]

I really really thought I copied it from our CropAndConcat implementation :( turns out I did not. That was the intention though