Can I change this demo to something that loads a custom dataset?

[GeorgePearse]

from fastai.vision.all import *

path = untar_data(URLs.PETS)/'images'
dls = ImageDataLoaders.from_name_func(
    path, get_image_files(path), valid_pct=0.2,
    label_func=lambda x: x[0].isupper(), item_tfms=Resize(224))
    
# if a string is passed into the model argument, it will now use timm (if it is installed)
learn = vision_learner(dls, 'vit_tiny_patch16_224', metrics=error_rate)

learn.fine_tune(1)

This code snippet was very useful for me, but as a newbie to fastai it then took me a long time to find the DataLoader for a custom dataset.