Function build_minmax_max_sim 

pub fn build_minmax_max_sim<const A_BITS: usize, const B_BITS: usize>(
    isa: MaxSimIsa,
    query: QueryMatRef<'_, MinMaxMeta<A_BITS>>,
) -> Result<MinMaxMaxSim<B_BITS>, BuildMaxSimError>
where
    Unsigned: MinMaxKernelFactory<A_BITS, B_BITS>,

Build a kernel that owns a copy of the MinMax query.

Auto selects a backend at construction. Explicit ISA requests never silently fall back. Reference uses an independent scalar implementation.

Kernels return negative maximum inner products, matching the MaxSim distance convention.

Supports equal query/document bit widths from 1 through 8, plus 8-bit queries with 1-, 2-, or 4-bit documents. Other combinations fail to compile.

Errors

Returns BuildMaxSimError for an unavailable ISA, a query dimension exceeding the bit-width pair’s accumulator limit, or an overflowing storage size. Dimension and canonical-size checks apply to every backend, including empty queries; packed-size checks apply only to prepared kernels. Allocation exhaustion follows the allocator’s normal behavior.

Example

use diskann_quantization::{
    minmax::{MinMaxMeta, build_minmax_max_sim},
    multi_vector::{Defaulted, Mat, MaxSimIsa, QueryMatRef},
};
let query = Mat::new(MinMaxMeta::<8>::new(2, 16), Defaulted)?;
let document = Mat::new(MinMaxMeta::<4>::new(3, 16), Defaulted)?;
let query = QueryMatRef::from(query.as_view());
let kernel = build_minmax_max_sim::<8, 4>(MaxSimIsa::Auto, query)?;
let mut scores = vec![0.0; kernel.nrows()];
kernel.compute_max_sim(document.as_view(), &mut scores)?;
assert_eq!(scores, vec![0.0; 2]);