Struct Sample 

pub struct Sample { /* private fields */ }

A transform that randomly samples rows from a RecordBatch.

Useful for creating train/test splits or reducing dataset size. Requires the shuffle feature.

Example

use alimentar::Sample;

// Sample 100 rows with a fixed seed
let sample = Sample::new(100).with_seed(42);

// Sample 10% of rows
let sample = Sample::fraction(0.1);

Implementations

impl Sample

pub fn new(count: usize) -> Self

Creates a Sample transform that selects exactly count rows.

If the batch has fewer rows than count, all rows are returned.

pub fn fraction(frac: f64) -> Self

Creates a Sample transform that selects a fraction of rows.

The fraction should be between 0.0 and 1.0.

pub fn with_seed(self, seed: u64) -> Self

Sets a seed for reproducible sampling.

pub fn count(&self) -> Option<usize>

Returns the sample count if set.

pub fn sample_fraction(&self) -> Option<f64>

Returns the sample fraction if set.

Trait Implementations

impl Clone for Sample

fn clone(&self) -> Sample

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Sample

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

Formats the value using the given formatter.

impl Transform for Sample

Available on crate feature shuffle only.

fn apply(&self, batch: RecordBatch) -> Result<RecordBatch>

Applies the transform to a RecordBatch.