hnsw-stable 0.10.1

Pure-Rust port of hnswlib (HNSW approximate nearest neighbors)
Documentation 
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use crate::scalar::Dtype;
use crate::scalar::Scalar;
use std::marker::PhantomData;

pub trait VectorRef: Copy
{
  fn len(self) -> usize;
  fn is_empty(self) -> bool;
}

impl<T> VectorRef for &[T]
{
  #[inline]
  fn len(self) -> usize
  {
    self.len()
  }
  #[inline]
  fn is_empty(self) -> bool
  {
    self.is_empty()
  }
}

#[derive(Clone, Copy, Debug)]
pub struct Qi8Ref<'a>
{
  pub data: &'a [i8],
  pub scale: f32,
  pub zero_point: i8,
}

impl VectorRef for Qi8Ref<'_>
{
  #[inline]
  fn len(self) -> usize
  {
    self.data.len()
  }
  #[inline]
  fn is_empty(self) -> bool
  {
    self.data.is_empty()
  }
}

pub trait VectorFamily: Copy + Clone + Send + Sync + 'static
{
  type Ref<'a>: VectorRef
  where
    Self: 'a;

  const DTYPE: Dtype;
}

#[derive(Clone, Copy, Debug, Default)]
pub struct Dense<S: Scalar>(PhantomData<S>);

impl<S: Scalar> VectorFamily for Dense<S>
{
  type Ref<'a>
    = &'a [S]
  where
    Self: 'a;

  const DTYPE: Dtype = S::DTYPE;
}

#[derive(Clone, Copy, Debug, Default)]
pub struct Qi8;

impl VectorFamily for Qi8
{
  type Ref<'a>
    = Qi8Ref<'a>
  where
    Self: 'a;

  const DTYPE: Dtype = Dtype::QI8;
}

pub trait VectorView<F: VectorFamily>: Clone + Send + Sync
{
  fn view<'a>(&'a self) -> <F as VectorFamily>::Ref<'a>;
}

impl<S: Scalar> VectorView<Dense<S>> for &[S]
{
  fn view(&self) -> &[S]
  {
    self
  }
}

impl<'v> VectorView<Qi8> for Qi8Ref<'v>
{
  fn view<'a>(&'a self) -> Qi8Ref<'a>
  {
    Qi8Ref {
      data: self.data,
      scale: self.scale,
      zero_point: self.zero_point,
    }
  }
}