Struct LexicalCost 

pub struct LexicalCost;

The v1 default cost model: 1 - gestalt_ratio over the steps’ token sequences.

A step’s comparable text is "{name}: {outputs}" capped at [TEXT_CAP] characters — outputs only, not inputs, because outputs carry the step’s observable behavior while inputs largely echo the previous step’s outputs (spike 001 design, kept). The text is tokenized to lowercase ASCII-alphanumeric runs, the same vocabulary a future tf-idf model would use.

Its prepared form is the token sequence itself, so a full alignment tokenizes each step once (O(n+m)) and the O(n·m) cells spend only the gestalt ratio (issue #16; before/after curves in notebook 022/023).

Trait Implementations

impl Clone for LexicalCost

fn clone(&self) -> LexicalCost

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for LexicalCost

impl CostModel for LexicalCost

type Prepared = Vec<String>

The per-step precomputation this model compares by.

fn prepare(&self, step: &Step) -> Self::Prepared

Digest one step into its comparable form.

fn cost_prepared(&self, a: &Self::Prepared, b: &Self::Prepared) -> f64

Cost of aligning two prepared steps.

fn cost(&self, a: &Step, b: &Step) -> f64

Cost of aligning a with b: prepare both, score once. A one-off convenience — code that compares many pairs prepares each step once and calls cost_prepared.

impl Debug for LexicalCost

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

Formats the value using the given formatter.

impl Default for LexicalCost

fn default() -> LexicalCost

Returns the “default value” for a type.