Struct NysCfg 

pub struct NysCfg {
    pub m: usize,
    pub w: usize,
    pub sink: usize,
    pub prefill: Option<usize>,
}

Nyström joint kernel geometry — matches nystrom::O1Cfg semantics.

Fields

m: usize

Landmark budget (m_eff = clamp(t_prefill/8, 4, m), as sealed).

w: usize

Exact-window width.

sink: usize

Permanent exact sink keys.

prefill: Option<usize>

Tokens of each training window that run the EXACT prompt pass before the O(1) seal. None = half the window.

This is not a free knob: it is the train/serve contract. The runtime (nystrom::NystromState::prefill) freezes landmarks from the PROMPT ONLY and then serves every later position off that frozen skeleton, so a trainer that seals from the whole window is optimizing a model that is never served. The default mirrors cortiq ppl --o1’s own default (o1_prefill = len/2), which is the discipline every published o1 quality number was measured with — keep them equal or the polish and the gate disagree.

Implementations

impl NysCfg

pub fn prefill_len(&self, t: usize) -> usize

Prompt length for a t-token window: the seal point. Clamped to [1, t] so a caller cannot ask for a prefix longer than the window.

Trait Implementations

impl Clone for NysCfg

fn clone(&self) -> NysCfg

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for NysCfg

impl Debug for NysCfg

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.