pub struct FeatureHasher { /* private fields */ }Expand description
Feature hasher (hashing trick) for text classification
Maps tokens to a fixed-size feature vector using hashing, avoiding the need to maintain a vocabulary dictionary. This is memory-efficient for large vocabularies.
Implementations§
Source§impl FeatureHasher
impl FeatureHasher
Sourcepub fn new(n_features: usize) -> Self
pub fn new(n_features: usize) -> Self
Create a new feature hasher with the specified number of features
Sourcepub fn transform_text(&self, text: &str) -> Result<Array1<f64>>
pub fn transform_text(&self, text: &str) -> Result<Array1<f64>>
Transform a single text into a hashed feature vector
Sourcepub fn transform_batch(&self, texts: &[&str]) -> Result<Array2<f64>>
pub fn transform_batch(&self, texts: &[&str]) -> Result<Array2<f64>>
Transform multiple texts into a feature matrix
Sourcepub fn num_features(&self) -> usize
pub fn num_features(&self) -> usize
Get the number of features
Trait Implementations§
Auto Trait Implementations§
impl Freeze for FeatureHasher
impl !RefUnwindSafe for FeatureHasher
impl Send for FeatureHasher
impl Sync for FeatureHasher
impl Unpin for FeatureHasher
impl UnsafeUnpin for FeatureHasher
impl !UnwindSafe for FeatureHasher
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Source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
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Converts
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Converts
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if into_left(&self) returns true.
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fn from_subset(element: &SS) -> SP
The inclusion map: converts
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