Struct FeatureHasher 

pub struct FeatureHasher {
    pub n_features: usize,
    pub alternate_sign: bool,
}

Feature Hashing (Hashing Trick)

Maps features to a fixed-size feature space using hashing. Useful for high-dimensional sparse features.

Fields

n_features: usize

alternate_sign: bool

Implementations

impl FeatureHasher

pub fn new(n_features: usize) -> Self

pub fn alternate_sign(self, value: bool) -> Self

pub fn transform_strings(&self, features: &[Vec<String>]) -> Tensor

Transform string features to hashed features

pub fn transform_pairs(&self, features: &[Vec<(String, f32)>]) -> Tensor

Transform feature-value pairs