Struct FittedOrdinalEncoder 

pub struct FittedOrdinalEncoder { /* private fields */ }

A fitted ordinal encoder holding per-column category-to-index mappings.

Created by calling Fit::fit on an OrdinalEncoder.

Implementations

impl FittedOrdinalEncoder

pub fn categories(&self) -> &[Vec<String>]

Return the ordered category list for each column.

categories()[j][i] is the category that maps to integer i in column j.

pub fn n_features(&self) -> usize

Return the number of input columns (features).

Trait Implementations

impl Clone for FittedOrdinalEncoder

fn clone(&self) -> FittedOrdinalEncoder

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FittedOrdinalEncoder

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

Formats the value using the given formatter.

impl Transform<ArrayBase<OwnedRepr<String>, Dim<[usize; 2]>>> for FittedOrdinalEncoder

fn transform(&self, x: &Array2<String>) -> Result<Array2<usize>, FerroError>

Transform string categories to integer indices.

Errors

Returns FerroError::ShapeMismatch if the number of columns does not match the number of features seen during fitting.

Returns FerroError::InvalidParameter if any category was not seen during fitting.

type Output = ArrayBase<OwnedRepr<usize>, Dim<[usize; 2]>>

The transformed output type.

type Error = FerroError

The error type returned by transform.