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* [Fix] inverse not working on cpu
* Add setup.py, setup.cfg, README.md, .gitignore, and requirements.txt
* DisplacementField: minor bug fixes, refactors, and comments
* Safe division to avoid NaNs during backward pass
* Use winding number to test inclusion rather than bounding i,j
* Epsilon for comparison to zero
* Autopad functionality in left inverse
* More efficient left inverse using sparse tensors
* Mean finite vector function
* Inefficient implementation of left inverse
* Add DisplacementField class to abstract displacement field operations
* Initial commit