Remove syncs from segment candidate metrics - #4500
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Summary: Add a flag-gated fixed-shape candidate-count path for segment metrics. Reuse a CPU-resident max-candidate bound for GAUC so the compiled update path avoids CUDA scalar reads and data-dependent indexing. Preserve the existing behavior when `ENABLE_SEGMENT_METRICS_NUM_CANDIDATES_OPT` is disabled. Differential Revision: D113910954
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Summary:
Add a flag-gated fixed-shape candidate-count path for segment metrics. Reuse a CPU-resident max-candidate bound for GAUC so the compiled update path avoids CUDA scalar reads and data-dependent indexing.
Preserve the existing behavior when
ENABLE_SEGMENT_METRICS_NUM_CANDIDATES_OPTis disabled.Differential Revision: D113910954