Diffdrr

What's Changed
* Enable cuda testing with GitHub CI by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/135
* New unified API for generating DRRs

The DRR module will now behave as follows:
- Initialize the DRR module as before (volume, spacing, height, pixel_spacing) except don't pass any pose parameters. Instead, initialize a set of dummy pose parameters that are internal to the model.
- Rename _update_params to move_carm. Change the function signature to input two batched vectors, one for translations and rotations. This will be the only way to reposition the C-Arm.
- To render a DRR, only use the forward call (i.e., drr()). No separate project function. This will return a batch of DRRs that are differentiable wrt to all downstream parameters.


**Full Changelog**: https://github.com/eigenvivek/DiffDRR/compare/v0.3.1...v0.3.2

What's Changed
* Add conversion to DeepDRR by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/134


**Full Changelog**: https://github.com/eigenvivek/DiffDRR/compare/v0.3.0...v0.3.1

DiffDRR` is now built using `nbdev` as the backend! Main advantage: there's now a functional docs site: https://vivekg.dev/DiffDRR



What's Changed
* Make default DiffDRR dtype torch.float32 by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/123
* Implement with nbdev by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/126


**Full Changelog**: https://github.com/eigenvivek/DiffDRR/compare/v0.2.3...v0.3.0

What's Changed
* Noooooow batching should fully work by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/119
* Redo Siddon class as a function by eigenvivek in https://github.com/eigenvivek/DiffDRR/pull/121


**Full Changelog**: https://github.com/eigenvivek/DiffDRR/compare/v0.2.1...v0.2.3

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