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How would you migrate a PyTorch workload to TPU?

torch_xla makes the demo run in an afternoon; making it fast is where migrations die. The lazy-tensor mental model, the recompilation traps, and the honest fork between porting and rewriting in JAX.

Updated Sep 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.

torch_xla makes the demo run in an afternoon; making it fast is where migrations die. The lazy-tensor mental model, the recompilation traps, and the honest fork between porting and rewriting in JAX.

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