What should remain after the series

The important outcome is not memorizing file names or class names. It is a better sense of how the layers connect:

  • tensor layout affects kernel performance
  • dispatcher behavior affects custom operator integration
  • autograd affects backward semantics and saved state
  • allocator and stream semantics affect real runtime behavior
  • compile paths affect modern optimization work

A good next-step order

  1. implement a small custom autograd function
  2. move the same idea into a C++ extension
  3. lower the hotspot into CUDA or Triton if needed
  4. verify the bottleneck with profiling
  5. check whether it still matters in distributed settings

That sequence turns internals knowledge into practical engineering ability.