Struct ForwardFill 

pub struct ForwardFill { /* private fields */ }

Replaces NaN values with the last observed non-NaN value.

This transformer accepts NaN in its input. When no value has been seen for a feature, 0.0 is used as the fill value.

Implementations

impl ForwardFill

pub fn new(feature_count: usize) -> Result<Self, RillError>

Create a new forward-fill imputer for feature_count features.

Errors

Returns RillError::EmptyFeatures if feature_count is 0.

pub fn last_values(&self) -> &[Option<f64>]

The per-feature last observed non-NaN values (None if unseen).

Trait Implementations

impl Clone for ForwardFill

fn clone(&self) -> ForwardFill

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ForwardFill

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

Formats the value using the given formatter.

impl Transformer for ForwardFill

fn input_dim(&self) -> usize

Expected number of input features.

fn output_dim(&self) -> usize

Number of features produced by transform.

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

Transform features using the current internal state.

fn update(&mut self, features: &[f64]) -> Result<(), RillError>

Update internal statistics using raw features.

fn samples_seen(&self) -> u64

How many samples the transformer has seen.

fn reset(&mut self)

Reset the transformer to its initial state.