On 01/05/2018 at 21:08, Marten wrote:
Just for completeness: there are *four* gufuncs (matmat, matvec,
vecmat, and vecvec).
I remain torn about the best way forward. The main argument against
using them inside matmul is that in order to decide which of the four
to use, matmul has to have access to the `shape` of the arguments.
This meants that means that `__array_ufunc__` cannot be used to
override `matmul` (or `@`) for any object which does not have a shape.
From that perspective, multiple signatures is definitely a more
elegant solution.
An advantage of the separate solution is that they are useful
independently of whether they are used internally in `matmul`; though,
then again, with a multi-signature matmul, these would be trivially
created as convenience functions.
-- Marten