Diffdrr

Main changes
- Batching fully works!
- Output DRRs have shape `[b c h w]`
- Initialization of parameters are different now
- You can use `.to()` to move DRR to devices and dtypes

What's Changed
* Update camera.py by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/109
* Adopt PyTorch conventions and best practices by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/116
* Update plotting function by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/118


**Full Changelog**: https://github.com/eigenvivek/DiffDRR/compare/v0.1.5...v0.2.1

What's Changed
* Fix batching and add test data by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/108


**Full Changelog**: https://github.com/eigenvivek/DiffDRR/compare/v0.1.3...v0.1.5

New features
- Implement random subsample DRRs for sparse registration (96)
- Add a lightweight animation library with `imageio` (98)
- Allow dtype of DRR to be set (101)
- Fix the offset for DRRs with even heights or widths (104)

What's Changed
* Speed up DRR generation with the GPU by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/2
* Fix DRR generation by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/8
* Add image similarity metrics by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/11
* Add more benchmarking by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/13
* Change Detector API to use spherical coordinates by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/14
* Add support for multiple GPU backends by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/17
* Overhaul API and add basic plotting functionality by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/18
* Redo API with optimization experiment by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/25
* Add animation pipeline by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/28
* Add finite differences comparison experiment by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/31
* Add learning example by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/33
* Update data loading API by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/36
* Add README by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/38
* Fix gif frame rate by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/41
* Rename module src->diffdrr by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/42
* Update notebook API by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/44
* Update README.md by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/48
* Add tests by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/55
* Create python-package-conda.yml by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/54
* Remove whitespace in GIFs by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/58
* Update python-package-conda.yml by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/59
* Gradient-free based optimization comparison by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/62
* Use einsum to batch DRR computation by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/65
* Fix some notebooks (68) by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/68
* Fix registration example and add L-BFGS by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/72
* Unstructure the forward projection model by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/77
* Use micromamba for CI by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/78
* Start working with normalized basis code by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/82
* Update spacings throughout code by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/83
* Normalized basis by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/81
* Implement sparse registration by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/85
* Update README.md by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/87
* Add PyPI install by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/88
* Update environment.yml by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/93
* Add CI fix by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/97
* Randomly subsample projections by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/96
* Add imageio animation library by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/98
* Dtype by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/99
* Make `dtype` of the DRR settable (101) by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/101
* Add different offsets for even and odd heights by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/103
* Update version.py by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/104


**Full Changelog**: https://github.com/eigenvivek/DiffDRR/commits/v0.1.3