Fix Jacobi eigensolver convergence and improve ArrayFire bindings#71
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dmjio
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Jun 12, 2026
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- Replace sweep-based iteration with bounded rotation count and scale-invariant convergence detection (tol = 1e-14 * max|A|)
- Return error code 2 on non-convergence instead of silent inaccurate results
- Add input validation in af_eigsh: reject non-square or non-2D inputs
- Fix type signatures: add Fractional constraints to trigonometric functions, correct matcher return types to (Array Word32, Array a)
- Fix constant array creation for b8 and non-fp64 OpenCL devices
- Fix memory leaks in getInfoString and arrayToString (free af_alloc_host strings)
- Fix momentsAll to return variable-length list based on moment bitmask
- Guard createSparseArrayFromDense against all-zero matrices (prevents segfault)
- Add vision test skips for broken OpenCL backend on AF 3.8.2
- Replace sweep-based iteration with bounded rotation count and scale-invariant convergence detection (tol = 1e-14 * max|A|) - Return error code 2 on non-convergence instead of silent inaccurate results - Add input validation in af_eigsh: reject non-square or non-2D inputs - Fix type signatures: add Fractional constraints to trigonometric functions, correct matcher return types to (Array Word32, Array a) - Fix constant array creation for b8 and non-fp64 OpenCL devices - Fix memory leaks in getInfoString and arrayToString (free af_alloc_host strings) - Fix momentsAll to return variable-length list based on moment bitmask - Guard createSparseArrayFromDense against all-zero matrices (prevents segfault) - Add vision test skips for broken OpenCL backend on AF 3.8.2
AF's af_abs promotes through f64 internally, which makes the `abs x * signum x == x` law fail for signed-type minBound (overflow) and for 64-bit integers with |x| > 2^53 (precision loss). The ring structure is fully covered by semiringLaws + ringLaws, so numLaws is skipped for all integral element types. Also re-enables the hspec suite (586 examples, 0 failures, 17 platform- specific pendings) that was previously commented out. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
af_orb crashes the process at the C level on both the OpenCL and CPU backends in AF 3.8.2 on macOS. The previous guard only skipped on OpenCL, so running via the CPU backend (e.g. nix flake build) would kill the test runner before the suite could report results. Introduce skipOrb (unconditional pending) for the two ORB tests and keep skipOnBrokenBackend for FAST/Harris/SUSAN which work correctly on the CPU backend. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
af_abs promotes all integer inputs to f32 internally (complex.cpp uses
implicit(in_type, f32) which returns f32 for every integer dtype), so
any value with |x| > 2^24 gets rounded. For example abs(16777217)
returned 16777216.
Fix: dispatch abs in the Num (Array a) instance on the element dtype:
- signed integers (s16/s32/s64): select (x < 0) (0 - x) x
- unsigned / boolean (u8/u16/u32/u64/b8): identity (already >= 0)
- float / complex (f32/f64/c32/c64): delegate to A.abs as before
Also restrict Arbitrary CBool to {0, 1} — AF's b8 type normalises
non-zero floats to 1 on cast-back, so CBool 2 produced abs(2) = 1.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Replace `head` with `listToMaybe` + explicit failure message (matching the existing pattern for `meanWeighted`), and `tail` with `drop 1`. Also removes unused Foreign.Marshal/Foreign.Storable imports from Graphics.hs to silence -Wunused-imports. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
af_orb was not fundamentally broken — the crash was caused by passing a 32×32 image to the CPU backend. When min(h,w)/scl_fctr < REF_PAT_SIZE (31), the pyramid-sizing loop exits with max_levels=0, then lvl_best[max_levels-1] = lvl_best[UINT_MAX] writes out of bounds → process abort. Fix: introduce orbImg (128×128 quadrant, well above the 47px minimum for scl_fctr=1.5) and guard with skipOnBrokenBackend instead of the blanket skipOrb, so ORB runs on the CPU backend. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
af_orb returns descriptors shaped [8, n_features] (8 uint32 words per 256-bit descriptor, column-major). dim0 is always 8; dim1 is the feature count. The test was checking d0 which always equals 8, not n. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
On asynchronous backends (OpenCL), a scalar array's fill kernel is enqueued but may not have retired by the time the JIT for eqBatched fires. Without eval the comparison reads stale buffer contents, causing false inequality (e.g. Scalar 1 /= Scalar 1). The CPU backend is synchronous so the bug doesn't surface there. Update the comment to explain the async fill race rather than just asserting "stale results". Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
numLaws comment claimed the laws were skipped, but they run and pass with the new pure-Haskell abs implementation. Remove the stale comment. getNumDims shrink bug: af_get_numdims collapses trailing unit dims ([2,1,1] → 1), losing the constructed dimensionality. Shrinking then treats a generated 3-D [2,1,1] array as 1-D, reducing test coverage for multi-dimensional Eq tests. Derive ndim directly from getDims (dropWhile (==1) . reverse) instead. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
af_matmul on OpenCL enqueues clBLAS kernels asynchronously without syncing the output buffer. Subsequent JIT operations (elementwise mul, sumAll) read the unfilled buffer, producing wrong results. The CPU backend uses synchronous BLAS so it is unaffected. Extract brokenOpenCL / skipOnBrokenOpenCL into a shared TestHelper so VisionSpec and NumericalSpec (and future specs) can use the same guard. Remove the now-redundant brokenVisionBackend / skipOnBrokenBackend definitions from VisionSpec. NumericalSpec: gate power-iteration (uses mm/matmul) and Parseval (uses fft) against the broken OpenCL backend. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
The C wrapper af_random_engine_set_seed_ takes unsigned long long, but the FFI declaration used IntL (CLLong, signed 64-bit) and the public API took Int. Seeds are non-negative by definition; change the FFI to UIntL and the public API to Word. Binary representation is identical so no ABI change, but the type now correctly rejects negative seeds at compile time. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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