Just looking at the source and all it is is:
class ToTensor(Transform):
"Convert item to appropriate tensor class"
order = 5
I don’t see anything that converts anything into a tensor. So what am I missing? Or what is going on here? 
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If you look in a separate file you’ll see class decors for @ToTensor.
I was confused by this as well. I believe the intention is to only have ToTensor provide this functionality if you import fastai.vision. If not, it’s essentially a noop.
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