A toy diffusion model runs ten steps, and two schedules are on offer for it. A schedule says how much of the original image is still present at each point, and both of these start from an untouched image and finish at pure noise — they differ only in the pacing in between.
The table gives the share of the original still present after each step, so step is handed the row above it as its input.
| after step | linear | cosine |
|---|---|---|
| 0 | ||
| 1 | ||
| 2 | ||
| 3 | ||
| 4 | ||
| 5 | ||
| 6 | ||
| 7 | ||
| 8 | ||
| 9 | ||
| 10 |
A step has real work to do only when the picture it is handed is partly destroyed. If the input is still essentially the original there is almost nothing to remove, and if the input is essentially pure noise there is almost nothing left to work with. Call a step useful when its input holds a share of the original strictly between and .
How many of its ten steps does each schedule spend on useful work?
Select all that apply.