`cupy` does not support `mT`

[amacati]

cupy arrays are currently missing the matrix transpose property mT.

import array_api_compat.cupy as cp
import array_api_strict as xp

x = xp.asarray([[1, 2, 3], [4, 5, 6]])
x.mT  # Works

x = cp.asarray([[1, 2, 3], [4, 5, 6]])
x.mT  # Fails: AttributeError: 'ndarray' object has no attribute 'mT'. Did you mean: 'T'?

[ev-br]

Thanks for the report.

This is, sadly, not something array-api-compat can work around: we can not touch the array object here.
That said, the attrbute has been added in recent enough CuPy versions. Building CuPy locally (cupy commit bc0963278) I get

In [4]: cupy.eye(3).mT
Out[4]: 
array([[1., 0., 0.],
       [0., 1., 0.],
       [0., 0., 1.]])

In [5]: cupy.__version__
Out[5]: '14.0.0a1'

Since this is not actionable in array-api-compat, I'm going to close this issue. Feel free to continue discussing regardless.

[amacati]

Oh nice, I didn't realize they already addressed this in the most recent version. That sort of solves the issue. Thanks for pointing that out!