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Patch and Rebuild

The fastest way to believe you can change PyTorch is to watch your own printf fire.

Key Insight​

Adding a simple printf inside a CUDA kernel and rebuilding lets you confirm that the code you just edited is the same code that runs when you call the op from Python.

Why This Matters​

This tiny change proves the whole loop — edit C++, recompile, run from Python — works on your machine. After that, real fixes and experiments are just bigger versions of the same loop.