Struct OrdinalEncoder 

pub struct OrdinalEncoder;

Encodes string categories as ordinal (integer) values per column.

Takes a list of columns (each column is a Vec<String>) and maps each unique category to a sorted integer index. This is useful as a preprocessing step before one-hot encoding or for ordinal features.

Implementations

impl OrdinalEncoder

pub fn new() -> Self

Create a new OrdinalEncoder.

pub fn fit(&self, columns: &[Vec<String>]) -> Result<FittedOrdinalEncoder>

Fit the encoder, learning the vocabulary for each column.

columns is a list of columns where each column is a Vec<String>. All columns must have the same length.

Trait Implementations

impl Clone for OrdinalEncoder

fn clone(&self) -> OrdinalEncoder

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for OrdinalEncoder

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

Formats the value using the given formatter.

impl Default for OrdinalEncoder

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for OrdinalEncoder

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for OrdinalEncoder

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.