Flip the ordering of quantiles (excluding the mean at index 0): [mean, q10, q20, ..., q90] → [mean, q90, q80, ..., q10]
The flat quantile array to flip.
Number of quantiles per step (10 for TimesFM 2.5).
If true, writes the result back into arr instead of allocating. Default false (safe, allocates new array).
arr
Flip the ordering of quantiles (excluding the mean at index 0): [mean, q10, q20, ..., q90] → [mean, q90, q80, ..., q10]