Struct FrequencyEncoder 

pub struct FrequencyEncoder { /* private fields */ }

Online frequency encoder for string features.

Maps each category to its observed frequency count / total.

Implementations

impl FrequencyEncoder

pub fn new() -> Self

Create a new empty encoder.

pub fn category_counts(&self) -> &BTreeMap<String, u64>

The per-category counts.

pub fn total(&self) -> u64

The total number of category observations seen.

pub fn transform_strs(&self, features: &[&str]) -> Result<Vec<f64>, RillError>

Return the observed frequency for each input string.

Unknown categories map to 0.0. Before any sample has been seen, all outputs are 0.0.

Errors

Returns RillError::EmptyFeatures if features is empty.

pub fn update_strs(&mut self, features: &[&str]) -> Result<(), RillError>

Increment counts for each category in features and increment samples_seen.

Errors

Returns RillError::EmptyFeatures if features is empty.

pub fn samples_seen(&self) -> u64

How many samples have been seen.

pub fn reset(&mut self)

Reset the encoder to its initial empty state.

Trait Implementations

impl Clone for FrequencyEncoder

fn clone(&self) -> FrequencyEncoder

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FrequencyEncoder

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

Formats the value using the given formatter.

impl Default for FrequencyEncoder

fn default() -> FrequencyEncoder

Returns the “default value” for a type.