Function prefixSharedLogps

prefixSharedLogps(
    model: RuntimeModel,
    promptIds: number[],
    chosenResp: number[],
    rejectedResp: number[],
): { lr: number; lw: number }
Debug: the two branch mean-logps (ℓw, ℓr) from the prefix-shared forward, no grad. For parity diagnostics (compare against the two-forward branch logps).
Parameters
- model: RuntimeModel
- promptIds: number[]
- chosenResp: number[]
- rejectedResp: number[]
Returns { lr: number; lw: number }
- Defined in packages/training/src/prefix-shared.ts:184