Add graph-based GPU Timer API - #4050
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Proposed changes
Add
mx.Timer, a graph-based API for measuring GPU execution time between two points in a lazy graph. It uses Metal command-buffer timestamps and CUDA events, preserves pytree structures through pass-through markers, and synchronizes inelapsed_time()before returning milliseconds.Add Python typing, tests, and usage documentation.
Checklist
pre-commit run --all-filesto format my code / installed pre-commit prior to committing changes