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# Changelog

## Versioning

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### v0.7.4
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* New filter basis normalization in DISCO convolutions
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* Reworked DISCO filter basis datastructure
* Support for new filter basis types
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* Added Zernike polynomial basis on a disk
* Added Morlet wavelet basis functions on a spherical disk
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* Cleaning up the SFNO example and adding new Local Spherical Neural Operator model
* Updated resampling module to extend input signal to the poles if needed
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* Added slerp interpolation to the resampling module
* Added distributed resampling module
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### v0.7.3

* Changing default grid in all SHT routines to `equiangular`
* Hotfix to the numpy version requirements

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### v0.7.2

* Added resampling modules for convenience
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* Changing behavior of distributed SHT to use `dim=-3` as channel dimension
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* Fixing SHT unittests to test SHT and ISHT individually, rather than the roundtrip
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* Changing the way custom CUDA extensions are handled
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### v0.7.1

* Hotfix to AMP in SFNO example

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### v0.7.0

* CUDA-accelerated DISCO convolutions
* Updated DISCO convolutions to support even number of collocation points across the diameter
* Distributed DISCO convolutions
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* Fused quadrature into multiplication with the Psi tensor to lower memory footprint
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* Removed DISCO convolution in the plane to focus on the sphere
* Updated unit tests which now include tests for the distributed convolutions

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### v0.6.5

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* Discrete-continuous (DISCO) convolutions on the sphere and in two dimensions
* DISCO supports isotropic and anisotropic kernel functions parameterized as hat functions
* Supports regular and transpose convolutions
* Accelerated spherical DISCO convolutions on GPU via Triton implementation
* Unittests for DISCO convolutions in `tests/test_convolution.py`
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### v0.6.4
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* Reworking distributed to allow for uneven split tensors, effectively removing the necessity of padding the transformed tensors
* Distributed SHT tests are now using unittest. Test extended to vector SHT versions
* Tests are defined in `torch_harmonics/distributed/distributed_tests.py`
* Base pytorch container version bumped up to 23.11 in Dockerfile
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### v0.6.3

* Adding gradient check in unit tests
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* Temporary work-around for NCCL contiguous issues with distributed SHT
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* Refactored examples and documentation
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* Updated SFNO example
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### v0.6.2

* Adding github CI
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* Changed SHT modules to convert dtype dynamically when computing the SHT/ISHT
* Bugfixes to fix importing examples
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### v0.6.1

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* Minor bugfixes to export SFNO code
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* Readme should now render correctly in PyPI

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### v0.6.0

* Added SFNO example
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* Added Shallow Water Equations Dataset for SFNO training
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* Cleanup of the repository and added PyPI
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* Updated Readme
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### v0.5.0
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* Reworked distributed SHT
* Module for sampling Gaussian Random Fields on the sphere

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### v0.4.0
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* Computation of associated Legendre polynomials
    * changed algorithm to compute the associated Legendre polynomials for improved stability
* Improved Readme

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### v0.3.0
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* Vector Spherical Harmonic Transforms
    * projects vector-valued fields onto the vector Spherical Harmonics
    * supports computation of div and curl on the sphere
* New quadrature rules
    * Clenshaw-Curtis quadrature rule
    * Fejér quadrature rule
    * Legendre-Gauss-Lobatto quadrature
* New notebooks
    * complete with differentiable Shallow Water Solver
    * notebook on quadrature and interpolation
* Unit tests
* Refactor of the API

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### v0.2.0
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* Renaming from torch_sht to torch_harmonics
* Adding distributed SHT support
* New logo

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### v0.1.0
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* Single GPU forward and backward transform
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* Minimal code example and notebook