Struct LinearChainCrf 

pub struct LinearChainCrf {
    pub n_labels: usize,
    pub n_features: usize,
    pub emissions: Vec<f64>,
    pub transitions: Vec<f64>,
}

Linear-chain CRF with linear emissions over real-valued features and a full dense transition matrix.

• emissions[label*n_features + k] — emission weight w_k for label
• transitions[prev*n_labels + cur] — transition weight from prev to cur

Fields

n_labels: usize

n_features: usize

emissions: Vec<f64>

transitions: Vec<f64>

Implementations

impl LinearChainCrf

pub fn zeros(n_labels: usize, n_features: usize) -> SeqResult<Self>

Construct a zero-initialised CRF.

pub fn param_count(&self) -> usize

Number of free parameters (emissions + transitions).

pub fn to_params(&self) -> Vec<f64>

Pack (emissions, transitions) into a flat parameter vector.

pub fn from_params(&mut self, p: &[f64]) -> SeqResult<()>

Unpack a flat parameter vector into (emissions, transitions).

pub fn emit_score(&self, label: usize, x: &[f64]) -> SeqResult<f64>

Compute the emission score for a single (label, feature_vec) pair.

pub fn trans_score(&self, prev: usize, cur: usize) -> SeqResult<f64>

Score for a single (prev_label, cur_label) transition.

pub fn sequence_score(&self, x: &[f64], y: &[usize]) -> SeqResult<f64>

Score of a full label sequence given a feature matrix (T × n_features).

Trait Implementations

impl Clone for LinearChainCrf

fn clone(&self) -> LinearChainCrf

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LinearChainCrf

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

Formats the value using the given formatter.