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test(index): stabilize lightweight 4-bit PQ recall #8784

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Merged
BubbleCal merged 1 commit into from
Aug 26, 2026
Merged

test(index): stabilize lightweight 4-bit PQ recall #8784

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12 changes: 10 additions & 2 deletions rust/lance/src/index/vector/ivf/v2.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2596,8 +2596,15 @@ mod tests {
}

fn lightweight_pq_params_with_bits(num_bits: usize) -> PQBuildParams {
let num_sub_vectors = if num_bits == 4 {
// M4 is only a 2-byte code, so random KMeans/HNSW can leave recall near
// the threshold. M32 restores the original 4-bit test capacity.
DIM
} else {
LIGHTWEIGHT_PQ_SUB_VECTORS
};
PQBuildParams {
num_sub_vectors: LIGHTWEIGHT_PQ_SUB_VECTORS,
num_sub_vectors,
num_bits,
max_iters: 2,
sample_rate: 16,
Expand Down Expand Up @@ -2667,6 +2674,7 @@ mod tests {
ivf_params.max_iters = 2;
ivf_params.sample_rate = 16;
let pq_params = lightweight_pq_params_with_bits(num_bits);
let expected_num_sub_vectors = pq_params.num_sub_vectors;
let params = if use_hnsw {
VectorIndexParams::with_ivf_hnsw_pq_params(
distance_type,
Expand Down Expand Up @@ -2704,7 +2712,7 @@ mod tests {
assert_eq!(stats["indices"][0]["sub_index"]["nbits"], num_bits);
assert_eq!(
stats["indices"][0]["sub_index"]["num_sub_vectors"],
LIGHTWEIGHT_PQ_SUB_VECTORS
expected_num_sub_vectors
);
if use_hnsw {
let hnsw_params = &stats["indices"][0]["sub_index"]["params"];
Expand Down
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