The proper name for a python package is the one in the setuptools
setup() call, which can also be seen on pypi.
Correct: https://pypi.org/project/torch/
Wrong: https://pypi.org/project/pytorch/
Includes a treewide rename of the attribute and creates aliases for the
old name.
There are many different versions of the `cudatoolkit` and related
cuda packages, and it can be tricky to ensure they remain compatible.
- `cudaPackages` is now a package set with `cudatoolkit`, `cudnn`, `cutensor`, `nccl`, as well as `cudatoolkit` split into smaller packages ("redist");
- expressions should now use `cudaPackages` as parameter instead of the individual cuda packages;
- `makeScope` is now used, so it is possible to use `.overrideScope'` to set e.g. a different `cudnn` version;
- `release-cuda.nix` is introduced to easily evaluate cuda packages using hydra.
