Overhead optimization#233
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June 24, 2026 15:06
…_H5_APPEND_ONLY delta flush Captured from the box's in-place pip-1.2.6 patches (sdk_overhead_patches/), ported onto ddp-support-wip. All env-gated (off by default): - WL_INSTANCE_TARGETS_CPU: detach per-instance targets to CPU at enqueue (seg-mask VRAM fix). - empty-mask guard: np.max([]) on 0-instance rows. - WL_H5_APPEND_ONLY: O(delta) append-only H5 flush vs read-all->merge->rewrite-all.
…ple signals Under UL native DDP the trainer model is a DDP wrapper, so signal hooks that read model.criterion/init_criterion/args/modules raised AttributeError. Unwrap to model.module in install_per_sample_signals (single entry point feeding both default_train_signals + install_train_pipeline). Unblocks UL-YOLO under DDP. Found via re-exec spike: WLAwareTrainer survives DDP re-exec + per-rank init works; this was the first real blocker.
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Merged overhead opt. into the DDP branch as both are related and necessary for v1.3.1