🚀 Feature

torch.triangular_solve should have an option to solve A^H x = b, where "^H" is the conjugate transpose operation.

Motivation

Now that PyTorch is expanding the complex number support, linear algebra methods that have transposed variants usually also have conjugate transpose variants for complex inputs. That should be supported as well.

Additional context

SciPy's triangular_solve has this option and the underlying BLAS/LAPACK libraries allow that (with trans='C').

cc @ezyang @anjali411 @dylanbespalko @mruberry @vincentqb @vishwakftw @jianyuh @nikitaved @pearu