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use crate::*;
use ndarray::ArrayView2;
use rayon::iter::repeatn;
pub struct BulkInterface<D: PointCloud> {
reader: CoverTreeReader<D>,
}
impl<D: PointCloud> BulkInterface<D> {
pub fn new(reader: CoverTreeReader<D>) -> Self {
BulkInterface { reader }
}
pub fn index_map_with_reader<F, T>(&self, point_indexes: &[usize], f: F) -> Vec<T>
where
F: Fn(&CoverTreeReader<D>, usize) -> T + Send + Sync,
T: Send + Sync,
{
let indexes_iter = point_indexes.par_chunks(100);
let reader_copies = indexes_iter.len();
let mut chunked_results: Vec<Vec<T>> = indexes_iter
.zip(repeatn(self.reader.clone(), reader_copies))
.map(|(chunk_indexes, reader)| chunk_indexes.iter().map(|p| f(&reader, *p)).collect())
.collect();
chunked_results
.drain(..)
.fold_first(|mut a, mut x| {
a.extend(x.drain(..));
a
})
.unwrap()
}
pub fn point_map_with_reader<'a, F, T>(&self, points: &[D::PointRef<'a>], f: F) -> Vec<T>
where
F: Fn(&CoverTreeReader<D>, &D::PointRef<'a>) -> T + Send + Sync,
T: Send + Sync,
{
let point_iter = points.par_chunks(100);
let reader_copies = point_iter.len();
let mut chunked_results: Vec<Vec<T>> = point_iter
.zip(repeatn(self.reader.clone(), reader_copies))
.map(|(chunk_points, reader)| chunk_points.iter().map(|p| f(&reader, p)).collect())
.collect();
chunked_results
.drain(..)
.fold_first(|mut a, mut x| {
a.extend(x.drain(..));
a
})
.unwrap()
}
pub fn known_path(&self, point_indexes: &[usize]) -> Vec<GokoResult<Vec<(f32, NodeAddress)>>> {
self.index_map_with_reader(point_indexes, |reader, i| reader.known_path(i))
}
pub fn known_path_and<F, T>(&self, point_indexes: &[usize], f: F) -> Vec<T>
where
F: Fn(&CoverTreeReader<D>, GokoResult<Vec<(f32, NodeAddress)>>) -> T + Send + Sync,
T: Send + Sync,
{
self.index_map_with_reader(point_indexes, |reader, i| f(&reader, reader.known_path(i)))
}
pub fn path<'a>(&self, points: &[D::PointRef<'a>]) -> Vec<GokoResult<Vec<(f32, NodeAddress)>>> {
self.point_map_with_reader(points, |reader, p| reader.path(&p))
}
pub fn knn<'a>(
&self,
points: &[D::PointRef<'a>],
k: usize,
) -> Vec<GokoResult<Vec<(f32, usize)>>> {
self.point_map_with_reader(points, |reader, p| reader.knn(p, k))
}
pub fn routing_knn<'a>(
&self,
points: &[D::PointRef<'a>],
k: usize,
) -> Vec<GokoResult<Vec<(f32, usize)>>> {
self.point_map_with_reader(points, |reader, p| reader.routing_knn(&p, k))
}
}
impl<D: PointCloud<Point = [f32]>> BulkInterface<D> {
pub fn array_map_with_reader<'a, F, T>(&self, points: ArrayView2<'a, f32>, f: F) -> Vec<T>
where
F: Fn(&CoverTreeReader<D>, &&[f32]) -> T + Send + Sync,
T: Send + Sync,
{
let indexes: Vec<usize> = (0..points.nrows()).collect();
let point_iter = indexes.par_chunks(100);
let reader_copies = point_iter.len();
let mut chunked_results: Vec<Vec<T>> = point_iter
.zip(repeatn(self.reader.clone(), reader_copies))
.map(|(chunk_points, reader)| {
chunk_points
.iter()
.map(|i| f(&reader, &points.row(*i).as_slice().unwrap()))
.collect()
})
.collect();
chunked_results
.drain(..)
.fold_first(|mut a, mut x| {
a.extend(x.drain(..));
a
})
.unwrap()
}
}
#[cfg(test)]
pub(crate) mod tests {
use super::*;
use std::env;
use crate::covertree::tests::build_mnist_tree;
#[test]
fn bulk_path() {
if env::var("TRAVIS_RUST_VERSION").is_err() {
let tree = build_mnist_tree();
let reader = tree.reader();
let interface = BulkInterface::new(tree.reader());
let cloud = reader.point_cloud();
let points: Vec<&[f32]> = (0..100).map(|i| cloud.point(i).unwrap()).collect();
let path_results = interface.path(&points);
for (i, path) in path_results.iter().enumerate() {
let old_path = reader.path(&cloud.point(i).unwrap()).unwrap();
for ((d1, a1), (d2, a2)) in (path.as_ref().unwrap()).iter().zip(old_path) {
assert_approx_eq!(*d1, d2);
assert_eq!(*a1, a2);
}
}
}
}
#[test]
fn bulk_knn() {
if env::var("TRAVIS_RUST_VERSION").is_err() {
let tree = build_mnist_tree();
let reader = tree.reader();
let interface = BulkInterface::new(tree.reader());
let cloud = reader.point_cloud();
let points: Vec<&[f32]> = (0..10).map(|i| cloud.point(i).unwrap()).collect();
let knn_results = interface.knn(&points, 5);
for (i, knn) in knn_results.iter().enumerate() {
let old_knn = reader.knn(&cloud.point(i).unwrap(), 5).unwrap();
for ((d1, a1), (d2, a2)) in (knn.as_ref().unwrap()).iter().zip(old_knn) {
assert_approx_eq!(*d1, d2);
assert_eq!(*a1, a2);
}
}
}
}
}