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Converge PQ pivot loading #1276

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fd0cb6c
Converge PQ pivot loading
xinyuwen2 Jul 27, 2026
70b594c
Fix clippy warning in PQ pivot loading
xinyuwen2 Jul 27, 2026
8b43b13
Cover PQ pivot validation paths
xinyuwen2 Jul 27, 2026
1d351e2
Keep PQ pivot chunk inference scoped
xinyuwen2 Jul 27, 2026
955beb2
Clarify PQ chunk offset shape errors
xinyuwen2 Jul 28, 2026
7f15dc4
Limit PQ chunk offset bounds checks to inference
xinyuwen2 Jul 28, 2026
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99 changes: 12 additions & 87 deletions diskann-providers/src/model/pq/fixed_chunk_pq_table.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -671,9 +671,8 @@ pub fn compute_pq_distance_for_pq_coordinates(
mod fixed_chunk_pq_table_test {
use core::ops::Range;

use crate::storage::{StorageReadProvider, VirtualStorageProvider};
use crate::storage::{PQStorage, VirtualStorageProvider};
use approx::assert_relative_eq;
use diskann::error::ErrorContext;
use diskann_utils::test_data_root;
use diskann_vector::{
PureDistanceFunction,
Expand All @@ -682,9 +681,17 @@ mod fixed_chunk_pq_table_test {
use itertools::iproduct;

use super::*;
use crate::{model::NUM_PQ_CENTROIDS, utils::read_bin_from};
use crate::model::NUM_PQ_CENTROIDS;

const DIM: usize = 128;
const PQ_PIVOTS_PATH: &str = "/sift/siftsmall_learn_pq_pivots.bin";

fn load_test_pivots() -> FixedChunkPQTable {
let storage_provider = VirtualStorageProvider::new_overlay(test_data_root());
PQStorage::new(PQ_PIVOTS_PATH, "", None)
.load_pq_pivots_bin(PQ_PIVOTS_PATH, 1, &storage_provider)
.unwrap()
}

#[test]
fn constructor_errors() {
Expand Down Expand Up @@ -807,14 +814,8 @@ mod fixed_chunk_pq_table_test {

#[test]
fn load_pivot_test() {
let storage_provider = VirtualStorageProvider::new_overlay(test_data_root());
let pq_pivots_path: &str = "/sift/siftsmall_learn_pq_pivots.bin";
let (dim, pq_table, chunk_offsets) =
load_pq_pivots_bin(pq_pivots_path, &1, &storage_provider).unwrap();
let fixed_chunk_pq_table =
FixedChunkPQTable::new(dim, pq_table.into(), chunk_offsets.into()).unwrap();
let fixed_chunk_pq_table = load_test_pivots();

assert_eq!(dim, DIM);
assert_eq!(fixed_chunk_pq_table.table.dim(), DIM);
assert_eq!(fixed_chunk_pq_table.table.ncenters(), NUM_PQ_CENTROIDS);

Expand All @@ -834,14 +835,7 @@ mod fixed_chunk_pq_table_test {

#[test]
fn calculate_distances_tests() {
let storage_provider = VirtualStorageProvider::new_overlay(test_data_root());

let pq_pivots_path: &str = "/sift/siftsmall_learn_pq_pivots.bin";

let (dim, pq_table, chunk_offsets) =
load_pq_pivots_bin(pq_pivots_path, &1, &storage_provider).unwrap();
let fixed_chunk_pq_table =
FixedChunkPQTable::new(dim, pq_table.into(), chunk_offsets.into()).unwrap();
let fixed_chunk_pq_table = load_test_pivots();

let query_vec: Vec<f32> = vec![
32.39f32, 78.57f32, 50.32f32, 80.46f32, 6.47f32, 69.76f32, 94.2f32, 83.36f32, 5.8f32,
Expand Down Expand Up @@ -990,75 +984,6 @@ mod fixed_chunk_pq_table_test {
}
}

type LoadPQPivotResult = (usize, Vec<f32>, Vec<usize>);
fn load_pq_pivots_bin<StorageProvider: StorageReadProvider>(
pq_pivots_path: &str,
num_pq_chunks: &usize,
storage_provider: &StorageProvider,
) -> ANNResult<LoadPQPivotResult> {
let mut reader = storage_provider
.open_reader(pq_pivots_path)
.with_context(|| format!("ERROR: Opening PQ k-means pivot file {}", pq_pivots_path))?;

let offsets = read_bin_from::<u64>(&mut reader, 0)?;
if offsets.nrows() != 4 {
return Err(ANNError::log_pq_error(format_args!(
"Error reading pq_pivots file {}. \
Offsets don't contain correct metadata, \
# offsets = {}, but expecting 4.",
pq_pivots_path,
offsets.nrows()
)));
}
let file_offset_data = offsets.map(|x| x.into_usize());

let mut pivots = read_bin_from::<f32>(&mut reader, file_offset_data[(0, 0)])?;

if pivots.nrows() != NUM_PQ_CENTROIDS {
return Err(ANNError::log_pq_error(format_args!(
"Error reading pq_pivots file {}. file_num_centers = {}, but expecting {} centers.",
pq_pivots_path,
pivots.nrows(),
NUM_PQ_CENTROIDS
)));
}
let dim = pivots.ncols();

let centroids = read_bin_from::<f32>(&mut reader, file_offset_data[(1, 0)])?;
if centroids.nrows() != dim || centroids.ncols() != 1 {
return Err(ANNError::log_pq_error(format_args!(
"Error reading pq_pivots file {}. file_dim = {}, \
file_cols = {} but expecting {} entries in 1 dimension.",
pq_pivots_path,
centroids.nrows(),
centroids.ncols(),
dim
)));
}

pivots.row_iter_mut().for_each(|row| {
std::iter::zip(row.iter_mut(), centroids.as_slice().iter()).for_each(|(p, c)| *p += *c);
});

let chunk_offsets_m = read_bin_from::<u32>(&mut reader, file_offset_data[(2, 0)])?;
if chunk_offsets_m.nrows() != num_pq_chunks + 1 || chunk_offsets_m.ncols() != 1 {
return Err(ANNError::log_pq_error(format_args!(
"Error reading pq_pivots file at chunk offsets; \
file has nr={}, nc={} but expecting nr={} and nc=1.",
chunk_offsets_m.nrows(),
chunk_offsets_m.ncols(),
num_pq_chunks + 1
)));
}
let chunk_offsets = chunk_offsets_m.map(|x| x.into_usize());

Ok((
dim,
pivots.into_inner().into_vec(),
chunk_offsets.into_inner().into_vec(),
))
}

#[test]
fn test_populate_chunk_distances() {
let dim = 8;
Expand Down
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