v0.9.0

• New CPU backend (OpenMP-accelerated) for both DISCO convolution and attention layers
• Pre-compiled manylinux wheels for multiple PyTorch and CUDA versions, available on PyPI and pypi.nvidia.com
• Revised truncation logic for the SHT: centralized in new truncation.py module, enforcing triangular truncation (lmax = min(lmax, mmax)) across all SHT classes. Note: truncation for equiangular/equidistant grids changed from nlat to (nlat+1)//2
• SHT performance improvements: contraction dimensions are now transposed to be stride-1 before einsum, and real/imaginary parts are split into separate contiguous tensors
• New fft.py wrapper module with proper Hermitian symmetry enforcement in irfft and explicit mode truncation in rfft
• Full PyTorch 2 custom operator compatibility for DISCO and attention layers using torch.library registration, enabling torch.compile and torch.export
• Restructured DISCO convolution and attention code into proper subpackages (torch_harmonics/disco/, torch_harmonics/attention/)
• Added double precision support for DISCO convolution
• Fixed Schmidt normalization for derivatives of associated Legendre polynomials
• Fixed up/downsampling in attention layers when input and output shapes differ
• Fixed GaussianRandomFieldS2 to use isht.lmax/isht.mmax for compatibility with revised truncation logic
• Distributed module: added shape verification for transpose and gather operations, controllable via TORCH_HARMONICS_DISTRIBUTED_DEBUG
• Distributed module: fixed finalize() bug where process group was not properly destroyed
• Query functions torch_harmonics.disco.optimized_kernels_is_available and torch_harmonics.attention.optimized_kernels_is_available for checking optimized layer availability
• Quadrature helper functions precompute_latitudes and precompute_longitudes are now public API
• added new tests:
  • Comprehensive SHT test suite now covering vector SHT, Schmidt normalization, batch dimensions, and multiple grid types
  • New test suites for SpectralConvS2, QuadratureS2, GaussianRandomFieldS2, and ResampleS2
    Enhanced DISCO convolution tests covering different input/output channel counts and double precision
  • Enhanced attention tests with up/downsampling and opcheck integration
  • New distributed tests for primitives, quadrature, and spectral convolution
  • Shared test utilities module (testutils.py)