Fixed-step cache¶
Fixed-step cache uses a deterministic fixed-step schedule rather than a learned or threshold-driven skip decision. The paper reports that the LTX-2.3 high-quality schedule required a custom fixed-step strategy because cache schedules tuned for Euler-style samplers did not transfer cleanly to the res_2s trajectory.
Sol-Engine placement¶
Sol-Engine uses fixed-step cache in the LTX-2.3 stage-specific denoising path as the selected cache component in the full optimization stack.
Why it is useful¶
The LTX-2.3 pipeline has two stages and only a few high-resolution refinement steps. A deterministic schedule can be safer than threshold replay when the sampler trajectory is short, sensitive, or unlike the schedule assumed by generic cache heuristics.
Tunable knobs¶
- skipped step indices.
- stage placement.
- recompute boundaries.
- residual compensation rule.
Validation¶
Inspect stage-specific artifacts as well as final output. A schedule that helps stage 1 can still be unacceptable if it destabilizes stage 2 refinement.