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use crate::{
traits::{ChromBounds, IntervalBounds, SetError, ValueBounds},
IntervalContainer,
};
use rand::{seq::SliceRandom, RngCore, SeedableRng};
use rand_chacha::ChaChaRng;
/// Utility functions for random sampling within a container.
impl<I, C, T> IntervalContainer<I, C, T>
where
I: IntervalBounds<C, T>,
C: ChromBounds,
T: ValueBounds,
{
/// Shuffles the elements of the container in place using the given random number generator.
///
/// # Example
/// ```
/// use bedrs::{BaseInterval, IntervalContainer};
/// use rand::thread_rng;
///
/// let intervals = vec![
/// BaseInterval::new(10, 100),
/// BaseInterval::new(20, 200),
/// BaseInterval::new(30, 300),
/// BaseInterval::new(40, 400),
/// ];
/// let mut set = IntervalContainer::from_sorted(intervals).unwrap();
/// set.shuffle_rng(&mut thread_rng());
/// ```
pub fn shuffle_rng(&mut self, rng: &mut impl RngCore) {
self.records_mut().shuffle(rng);
self.set_unsorted();
}
/// Shuffles the elements of the container in place.
///
/// # Example
/// ```
/// use bedrs::{BaseInterval, IntervalContainer};
///
/// let intervals = vec![
/// BaseInterval::new(10, 100),
/// BaseInterval::new(20, 200),
/// BaseInterval::new(30, 300),
/// BaseInterval::new(40, 400),
/// ];
/// let mut set = IntervalContainer::from_sorted(intervals).unwrap();
/// set.shuffle();
/// ```
pub fn shuffle(&mut self) {
let mut rng = rand::thread_rng();
self.shuffle_rng(&mut rng);
}
/// Shuffles the elements of the container in place using the given seed.
///
/// # Example
/// ```
/// use bedrs::{BaseInterval, IntervalContainer};
///
/// let intervals = vec![
/// BaseInterval::new(10, 100),
/// BaseInterval::new(20, 200),
/// BaseInterval::new(30, 300),
/// BaseInterval::new(40, 400),
/// ];
/// let mut set = IntervalContainer::from_sorted(intervals).unwrap();
/// set.shuffle_seed(42);
/// ```
pub fn shuffle_seed(&mut self, seed: u64) {
let mut rng = ChaChaRng::seed_from_u64(seed);
self.shuffle_rng(&mut rng);
}
/// Returns a new container with the elements of the container in random order using the given random number generator.
///
/// # Example
/// ```
/// use bedrs::{BaseInterval, IntervalContainer};
///
/// let intervals = vec![
/// BaseInterval::new(10, 100),
/// BaseInterval::new(20, 200),
/// BaseInterval::new(30, 300),
/// BaseInterval::new(40, 400),
/// ];
/// let set = IntervalContainer::from_sorted(intervals).unwrap();
/// let mut rng = rand::thread_rng();
/// let shuffled_set = set.sample_rng(2, &mut rng).unwrap();
/// assert_eq!(shuffled_set.len(), 2);
/// ```
pub fn sample_rng(&self, n: usize, rng: &mut impl RngCore) -> Result<Self, SetError> {
if n > self.records().len() {
return Err(SetError::SampleSizeTooLarge);
}
let mut records = self.records().clone();
records.shuffle(rng);
records.truncate(n);
Ok(Self::new(records))
}
/// Returns a new container with the elements of the container in random order.
///
/// # Example
/// ```
/// use bedrs::{BaseInterval, IntervalContainer};
///
/// let intervals = vec![
/// BaseInterval::new(10, 100),
/// BaseInterval::new(20, 200),
/// BaseInterval::new(30, 300),
/// BaseInterval::new(40, 400),
/// ];
/// let set = IntervalContainer::from_sorted(intervals).unwrap();
/// let shuffled_set = set.sample(2).unwrap();
/// assert_eq!(shuffled_set.len(), 2);
/// ```
pub fn sample(&self, n: usize) -> Result<Self, SetError> {
if n > self.records().len() {
return Err(SetError::SampleSizeTooLarge);
}
let mut rng = rand::thread_rng();
self.sample_rng(n, &mut rng)
}
/// Returns a new container with the elements of the container in random order using the given seed.
///
/// # Example
/// ```
/// use bedrs::{BaseInterval, IntervalContainer};
///
/// let intervals = vec![
/// BaseInterval::new(10, 100),
/// BaseInterval::new(20, 200),
/// BaseInterval::new(30, 300),
/// BaseInterval::new(40, 400),
/// ];
/// let set = IntervalContainer::from_sorted(intervals).unwrap();
/// let shuffled_set_a = set.sample_seed(2, 42).unwrap();
/// let shuffled_set_b = set.sample_seed(2, 42).unwrap();
/// assert_eq!(shuffled_set_a.len(), 2);
/// assert_eq!(shuffled_set_b.len(), 2);
/// ```
pub fn sample_seed(&self, n: usize, seed: u64) -> Result<Self, SetError> {
if n > self.records().len() {
return Err(SetError::SampleSizeTooLarge);
}
let mut rng = ChaChaRng::seed_from_u64(seed);
self.sample_rng(n, &mut rng)
}
/// Returns a new iterator over the elements of the container in random order using the
/// given random number generator.
///
/// # Example
/// ```
/// use bedrs::{BaseInterval, IntervalContainer};
///
/// let intervals = vec![
/// BaseInterval::new(10, 100),
/// BaseInterval::new(20, 200),
/// BaseInterval::new(30, 300),
/// BaseInterval::new(40, 400),
/// ];
/// let set = IntervalContainer::from_sorted(intervals).unwrap();
/// let mut rng = rand::thread_rng();
/// let shuffled_iter = set.sample_iter_rng(2, &mut rng).unwrap();
/// assert_eq!(shuffled_iter.count(), 2);
/// ```
pub fn sample_iter_rng<'a>(
&'a self,
n: usize,
rng: &mut impl RngCore,
) -> Result<Box<dyn Iterator<Item = &'a I> + 'a>, SetError> {
if n > self.records().len() {
return Err(SetError::SampleSizeTooLarge);
}
let iter = self.records().choose_multiple(rng, n);
Ok(Box::new(iter))
}
/// Returns a new iterator over the elements of the container in random order
///
/// # Example
/// ```
/// use bedrs::{BaseInterval, IntervalContainer};
///
/// let intervals = vec![
/// BaseInterval::new(10, 100),
/// BaseInterval::new(20, 200),
/// BaseInterval::new(30, 300),
/// BaseInterval::new(40, 400),
/// ];
/// let set = IntervalContainer::from_sorted(intervals).unwrap();
/// let shuffled_iter = set.sample_iter(2).unwrap();
/// assert_eq!(shuffled_iter.count(), 2);
pub fn sample_iter<'a>(
&'a self,
n: usize,
) -> Result<Box<dyn Iterator<Item = &'a I> + 'a>, SetError> {
if n > self.records().len() {
return Err(SetError::SampleSizeTooLarge);
}
let mut rng = rand::thread_rng();
self.sample_iter_rng(n, &mut rng)
}
/// Returns a new iterator over the elements of the container in random order using the
/// given seed.
///
/// # Example
/// ```
/// use bedrs::{BaseInterval, IntervalContainer};
///
/// let intervals = vec![
/// BaseInterval::new(10, 100),
/// BaseInterval::new(20, 200),
/// BaseInterval::new(30, 300),
/// BaseInterval::new(40, 400),
/// ];
/// let set = IntervalContainer::from_sorted(intervals).unwrap();
/// let shuffled_iter = set.sample_iter_seed(2, 42).unwrap();
/// assert_eq!(shuffled_iter.count(), 2);
/// ```
pub fn sample_iter_seed<'a>(
&'a self,
n: usize,
seed: u64,
) -> Result<Box<dyn Iterator<Item = &'a I> + 'a>, SetError> {
if n > self.records().len() {
return Err(SetError::SampleSizeTooLarge);
}
let mut rng = ChaChaRng::seed_from_u64(seed);
self.sample_iter_rng(n, &mut rng)
}
}
#[cfg(test)]
mod testing {
use crate::{BaseInterval, Coordinates, IntervalContainer};
#[test]
fn shuffle_rng() {
let intervals = vec![
BaseInterval::new(10, 100),
BaseInterval::new(20, 200),
BaseInterval::new(30, 300),
BaseInterval::new(40, 400),
BaseInterval::new(10, 100),
BaseInterval::new(20, 200),
BaseInterval::new(30, 300),
BaseInterval::new(40, 400),
];
let set = IntervalContainer::new(intervals);
let mut shuffled_set = set.clone();
shuffled_set.shuffle();
set.records()
.iter()
.zip(shuffled_set.records())
.all(|(a, b)| !a.eq(b));
}
#[test]
fn shuffle_rng_seed() {
let intervals = vec![
BaseInterval::new(10, 100),
BaseInterval::new(20, 200),
BaseInterval::new(30, 300),
BaseInterval::new(40, 400),
BaseInterval::new(10, 100),
BaseInterval::new(20, 200),
BaseInterval::new(30, 300),
BaseInterval::new(40, 400),
];
let set = IntervalContainer::new(intervals);
let mut shuffled_set_a = set.clone();
let mut shuffled_set_b = set.clone();
shuffled_set_a.shuffle_seed(0);
shuffled_set_b.shuffle_seed(0);
shuffled_set_a
.records()
.iter()
.zip(shuffled_set_b.records())
.all(|(a, b)| a.eq(b));
}
#[test]
fn shuffle_sorted_toggle() {
let intervals = vec![
BaseInterval::new(10, 100),
BaseInterval::new(20, 200),
BaseInterval::new(30, 300),
BaseInterval::new(40, 400),
];
let mut set = IntervalContainer::from_sorted(intervals).unwrap();
assert!(set.is_sorted());
set.shuffle();
assert!(!set.is_sorted());
}
#[test]
fn sample() {
let intervals = vec![
BaseInterval::new(10, 100),
BaseInterval::new(20, 200),
BaseInterval::new(30, 300),
BaseInterval::new(40, 400),
];
let set = IntervalContainer::from_sorted(intervals).unwrap();
let sampled_set = set.sample(4).unwrap();
assert_eq!(sampled_set.records().len(), 4);
assert!(!sampled_set.is_sorted());
}
#[test]
fn sample_seed() {
let intervals = vec![
BaseInterval::new(10, 100),
BaseInterval::new(20, 200),
BaseInterval::new(30, 300),
BaseInterval::new(40, 400),
];
let set = IntervalContainer::from_sorted(intervals).unwrap();
let sampled_set_a = set.sample_seed(4, 0).unwrap();
let sampled_set_b = set.sample_seed(4, 0).unwrap();
for (a, b) in sampled_set_a.records().iter().zip(sampled_set_b.records()) {
assert!(a.eq(b));
}
}
#[test]
fn sample_oversized() {
let intervals = vec![
BaseInterval::new(10, 100),
BaseInterval::new(20, 200),
BaseInterval::new(30, 300),
BaseInterval::new(40, 400),
];
let set = IntervalContainer::from_sorted(intervals).unwrap();
let sampled_set = set.sample(5);
assert!(sampled_set.is_err());
}
#[test]
fn sample_iter() {
let intervals = vec![
BaseInterval::new(10, 100),
BaseInterval::new(20, 200),
BaseInterval::new(30, 300),
BaseInterval::new(40, 400),
];
let set = IntervalContainer::from_sorted(intervals).unwrap();
let sampled_iter = set.sample_iter(2).unwrap();
assert_eq!(sampled_iter.count(), 2);
}
#[test]
fn sample_iter_seed() {
let intervals = vec![
BaseInterval::new(10, 100),
BaseInterval::new(20, 200),
BaseInterval::new(30, 300),
BaseInterval::new(40, 400),
];
let set = IntervalContainer::from_sorted(intervals).unwrap();
let sampled_iter_a = set.sample_iter_seed(2, 0).unwrap();
let sampled_iter_b = set.sample_iter_seed(2, 0).unwrap();
for (a, b) in sampled_iter_a.zip(sampled_iter_b) {
assert!(a.eq(b));
}
}
#[test]
fn sample_iter_oversized() {
let intervals = vec![
BaseInterval::new(10, 100),
BaseInterval::new(20, 200),
BaseInterval::new(30, 300),
BaseInterval::new(40, 400),
];
let set = IntervalContainer::from_sorted(intervals).unwrap();
let sampled_iter = set.sample_iter(5);
assert!(sampled_iter.is_err());
let sampled_iter_seed = set.sample_iter_seed(5, 0);
assert!(sampled_iter_seed.is_err());
}
}