Struct RowSubsampleMask 

pub struct RowSubsampleMask {
    pub id: u64,
    pub mask: Option<Arc<OuterScoreSubsample>>,
}

Identifier-carrying handle for a single row subsample mask.

The handle is Clone and cheap to copy; the Arc is shared, not duplicated.

Fields

id: u64

Stable 64-bit content hash. Same mask (by Arc pointer OR by row content) ⇒ same id; different mask ⇒ different id.

mask: Option<Arc<OuterScoreSubsample>>

None means full data (0..n, weight 1.0 per row). Some(_) means the rows and HT weights inside the subsample.

Implementations

impl RowSubsampleMask

pub fn full_data(n: usize) -> Self

Full-data measure: walk 0..n with weight 1.0 per row.

pub fn subsample(mask: Arc<OuterScoreSubsample>) -> Self

Subsample measure: walk the mask’s rows with their per-row HT weights. Id is derived from the Arc pointer (cheap and stable for the lifetime of the Arc) combined with mask metadata.

pub fn indices_and_weights(&self, n: usize) -> (Vec<usize>, Vec<f64>)

Materialize the row indices and per-row weights this measure implies. full_data(n) returns (0..n collected, [1.0; n]), preserving the full-data semantics of any caller that walked 0..self.n unconditionally with weight 1.0.

Trait Implementations

impl Clone for RowSubsampleMask

fn clone(&self) -> RowSubsampleMask

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RowSubsampleMask

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

Formats the value using the given formatter.