[DtoH sync] set scheduler begin index in SD3 T2I#14176
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Description
Sets the scheduler's begin index to 0 before the denoising loop in SD3 T2I, eliminating the implicit GPU→CPU synchronization point from
index_for_timestep.item(). This enables fulltorch.compilegraph capture.Follows the established pattern from PR #11696 (already deployed in Flux, Flux2, Wan, Z-Image, OVIS-Image, and SDXL).
Changes
src/diffusers/pipelines/stable_diffusion_3/pipeline_stable_diffusion_3.py: Added canonicalset_begin_index(0)block withhasattrguard before the denoising loop.Verification
pytest tests/pipelines/stable_diffusion_3/ -x -vmake style && make fix-copies && make qualitycleanThis is commit 1 of 6 per the Phase 1 plan.