What's Changed

Some quality improvements because of:

• Fix v_mean3d in project_g and v_conic calculation in *rasterize_backward by @jb-ye in https://github.com/nerfstudio-project/gsplat/pull/139
• add backprop grad of opacity compensation by @jb-ye in https://github.com/nerfstudio-project/gsplat/pull/140

Full Changelog: https://github.com/nerfstudio-project/gsplat/compare/v0.1.7...v0.1.8