Struct FittedColumnTransformer 

pub struct FittedColumnTransformer { /* private fields */ }

A fitted column transformer holding fitted sub-transformers and metadata.

Created by calling Fit::fit on a ColumnTransformer. Implements Transform<Array2<f64>> to apply the fitted transformers and concatenate their outputs, as well as FittedPipelineTransformer for use inside a ferrolearn_core::pipeline::Pipeline.

Implementations

impl FittedColumnTransformer

pub fn n_features_in(&self) -> usize

Return the number of input features seen during fitting.

pub fn transformer_names(&self) -> Vec<&str>

Return the names of all registered transformer steps.

pub fn remainder_indices(&self) -> &[usize]

Return the remainder column indices (columns not selected by any transformer).

Trait Implementations

impl FittedPipelineTransformer<f64> for FittedColumnTransformer

fn transform_pipeline(&self, x: &Array2<f64>) -> Result<Array2<f64>, FerroError>

Transform data using the pipeline interface.

Errors

Propagates errors from Transform::transform.

impl Transform<ArrayBase<OwnedRepr<f64>, Dim<[usize; 2]>>> for FittedColumnTransformer

fn transform(&self, x: &Array2<f64>) -> Result<Array2<f64>, FerroError>

Transform data by applying each fitted transformer to its column subset, then horizontally concatenating all outputs.

When remainder = Passthrough, the unselected columns are appended after all transformer outputs. When remainder = Drop, they are discarded.

Errors

• FerroError::ShapeMismatch if the input does not have n_features_in columns.
• Propagates any error from individual transformer transform_pipeline calls.

type Output = ArrayBase<OwnedRepr<f64>, Dim<[usize; 2]>>

The transformed output type.

type Error = FerroError

The error type returned by transform.