Updated derivative rules for complex svd and pinverse (#47761)
Summary:
Updated `svd_backward` to work correctly for complex-valued inputs.
Updated `common_methods_invocations.py` to take dtype, device arguments for input construction.
Removed `test_pinverse` from `test_autograd.py`, it is replaced by entries to `common_methods_invocations.py`.
Added `svd` and `pinverse` to list of complex tests.
References for complex-valued SVD differentiation:
- https://giggleliu.github.io/2019/04/02/einsumbp.html
- https://arxiv.org/abs/1909.02659
The derived rules assume gauge invariance of loss functions, so the result would not be correct for loss functions that are not gauge invariant.
https://re-ra.xyz/Gauge-Problem-in-Automatic-Differentiation/
The same rule is implemented in Tensorflow and [BackwardsLinalg.jl](https://github.com/GiggleLiu/BackwardsLinalg.jl).
Ref. https://github.com/pytorch/pytorch/issues/33152
Pull Request resolved: https://github.com/pytorch/pytorch/pull/47761
Reviewed By: ngimel
Differential Revision: D25658897
Pulled By: mruberry
fbshipit-source-id: ba33ecbbea3f592238c01e62c7f193daf22a9d01
