[Python] What is the best method when importing submodule from a parent module in Python

in many DL implementations in Python, I see two types of definitions when importing a submodule:

from torchvision import transforms

and

import torchvision.transforms as transforms

I want to know if they are really equivalent. I know if I want to rename the submodule to something else I should use the 2nd one, but is there any issues regarding speed and memory in any of the two methods?

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