Spectrum MiniMax H3 v0.1.3

Spectrum MiniMax H3 v0.1.3

Stabilizes deterministic Euler and RES multistep audio-video forecasting and adds Comfy Registry publishing metadata.

Changed

• Require one completed actual H3 evaluation after every RES multistep forecast so its retained old_denoised state is native before forecasting resumes.
• Enforce a three-step actual tail for deterministic RES, including saved workflows that request a smaller tail.
• Require one completed actual H3 evaluation after every Euler forecast to prevent late forecast streaks from accumulating temporal audio/video errors on short schedules.
• Keep ancestral Euler and RES variants on the native path because their injected noise breaks the forecaster's smooth deterministic trajectory assumption.
• Keep tail_actual_steps=1 as the configurable Euler default while applying the sampler-specific RES floor internally.
• Add the xmarre Comfy Registry publisher metadata and publishing workflow.

Highlights

• Forecasts selected post-transformer H3 features while preserving the native current-step output heads, reconstruction, sigma mapping, and return structure.
• Keeps runtime and history state isolated per model clone and rolls incomplete split-branch transactions back to a complete native step.
• Supports deterministic Euler and RES multistep sampling with sampler-specific post-forecast refresh and tail policies, plus explicit native fallback for stochastic samplers, unsupported samplers, incompatible topology, invalid forecasts, and multi-GPU parallel sampling.
• Bounds retained history on CPU and streams forecast accumulation in chunks to avoid persistent full-feature FP32 coefficient or right-hand-side tensors.
• Avoids redundant full-target GPU concatenation and CPU restacking on native single-call actual steps, and reports history/forecast timing counters in debug summaries.
• Leaves the separate FLUX-focused ComfyUI-Spectrum-Proper repository unchanged.

Measured 0.5 MP results

Supplied full-checkpoint, 20-step runs:

Sampler	Native	Spectrum	Schedule	Time saved	Wall-time reduction	Speedup
RES multistep	2:42	1:54	14 actual / 6 forecast	48 s	29.6%	1.42x
Euler	2:38	1:59	13 actual / 7 forecast	39 s	24.7%	1.33x

The tested Euler artifacts appeared fixed. The remaining slight RES artifacts appeared gone after enforcing the three-step actual tail.

Validation

• The local suite passes against native ComfyUI commit e377e263049f9338b4d12a3dd417b36ae62948ff.
• Automated tests cover forecasting mathematics, scheduling, rollback, clone isolation, the actual ComfyUI loader shape, native-path equivalence, and zero transformer-block execution on forecast steps.
• Sampler contract tests verify one model call per deterministic solver step, RES's current/previous-denoised recurrence and update ordering, ancestral noise injection, rollback-safe refresh state, and sampler-specific forecast spacing and tails.

Current limits

The automated environment cannot decode a full MiniMax H3 generation. Broader prompts, durations, resolutions, CFG settings, reference modes, memory peaks, and audiovisual synchronization remain real-generation validation items. Timings can vary with model warmup and GPU state.