[v0.51.0] Bump version to 0.51.0

[arkrishn94]

Bump version to 0.51.0 due to propagate changes to downstream consumers

Breaking API changes (AI Generated)

• ObjectPool moved (Move ObjectPool from diskann to diskann-utils #975): now lives in diskann-utils. Update imports from diskann::...::ObjectPool → diskann_utils::ObjectPool.

• AlignedSlice removed (remove alignedslice and replace with direct poly calls #994): the AlignedSlice abstraction in diskann-vector is gone. Code that converted between vector representations through AlignedSlice should now use the Poly / CastFromSlice polymorphic interfaces directly (see diskann-vector::conversion and diskann-quantization::alloc::poly). Storage that previously held AlignedSlice values should hold Poly<T, A> instead.

• AsThreadPool generic removed (Remove AsThreadPool generic and take &RayonThreadPool directly #967): functions that previously took pool: impl AsThreadPool now take pool: &RayonThreadPool. Pass a borrow of an existing pool; remove the generic parameter from your call sites.

• sgemm() returns Result (Replace sgemm() panics with Result-based error handling #997): in diskann-linalg, the new signature is:

  pub fn sgemm(
      atranspose: Transpose, btranspose: Transpose,
      m: usize, n: usize, k: usize,
      alpha: f32, a: &[f32], b: &[f32],
      beta: Option<f32>, c: &mut [f32],
  ) -> Result<(), SgemmError>

  SgemmError has variants InvalidMatrixDimensions { matrix_name, expected_rows, expected_cols, actual_len } and DimensionOverflow { matrix_name, rows, cols }. Replace previous panic-on-bad-input assumptions with explicit handling.

• Benchmarks are stateful ([benchmark/filtered-search prep] Make benchmarks stateful #995): the Benchmark impls in diskann-benchmark are no longer stateless unit structs. Each benchmark type now has a ::new() constructor (often holding PhantomData<T> or plugin state), and registration uses an instance:

  // before
  benchmarks.register("name", MyBench);
  // after
  benchmarks.register("name", MyBench::<T>::new());

  If you wrote a custom benchmark, give it a new() and register an instance. Combined with [benchmark/filtered-search prep] Search Plugins #996, search-side benchmarks now compose Plugins<Provider, Phase, Strategy> and expose builder methods like .search(plugin) to register search plugins on the instance.

• diskann-benchmark: async → graph-index (Rename async to graph-index in diskann-benchmark #1009): the benchmark category previously named async was renamed to graph-index. JSON config type values and example file names changed accordingly:

  • async-build → graph-index-build
  • async-dynamic-run → graph-index-dynamic-run
  • and the same prefix swap for *-pq, *-sq, *-spherical-quantization, etc.

  Update any benchmark config files, scripts, or CI that reference the old async-* names.

• diskann-disk buffer alignment decoupled from block_size ([diskann-disk] Decouple buffer memory alignment from disk block_size #984): code that assumed I/O buffer alignment equals the disk block size should now configure alignment explicitly.

Non-breaking

• New cache-aware block-transposed Chamfer/MaxSim distance for f32/f16 (Cache-Aware Block-Transposed Chamfer/MaxSim Distance for f32 and f16 #863).
• A/A benchmark documentation (Add A/A benchmark documentation #974); CI publish workflow improvements (crate publishing workflow #755, [CI] Fix publish dry-run check to skip non-publishable crates #1017); openssl bump (Bump openssl from 0.10.75 to 0.10.78 #973); compute_closest_centers allocation reduction (compute_closest_centers(): remove unnecessary allocation when pts_norms_squared is provided #980).
• DistanceComputer 'static bound relaxed (Relax the 'static bound on DistanceComputer. #1007) and redundant DistanceFunction impls removed (Remove unnecessary distance function implementations. #1008)

Full Changelog: v0.50.1...v0.51.0

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Bumps the Rust workspace/package version to 0.51.0 to propagate breaking API changes to downstream consumers.

Changes:

• Update [workspace.package] version to 0.51.0
• Update all workspace.dependencies internal crate versions to 0.51.0

---

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.51%. Comparing base (be804aa) to head (7e3b993).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1013      +/-   ##
==========================================
- Coverage   90.63%   89.51%   -1.12%     
==========================================
  Files         460      460              
  Lines       85424    85424              
==========================================
- Hits        77427    76471     -956     
- Misses       7997     8953     +956     

Flag	Coverage Δ
miri	89.51% <ø> (-1.12%)	⬇️
unittests	89.36% <ø> (-1.24%)	⬇️

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see 45 files with indirect coverage changes

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[hildebrandmw]

Thanks!