This notebook from fast.ai is more in line with what op mentioned. It starts from nothing but Python and slowly swaps out chunks of code with functions/classes

This notebook from fast.ai is more in line with what op mentioned. It starts from nothing but Python and slowly swaps out chunks of code with functions/classes from Torch/fastai: https://github.com/fastai/fastai/tree/master/courses/dl1 https://github.com/fastai/fastai/tree/master/courses/dl1