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Remove axisN keyword arguments from linalg.diag and linalg.trace - #241
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The NumPy versions operate on the first two axes, but the array API diagonal should operate on the last two, so that they work correctly on stacks of matrices. See data-apis/array-api#241.
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This PR
axis1andaxis2keyword arguments fromlinalg.diagandlinalg.trace.Background
linalg.diagandlinalg.trace, as currently specified, are unique in their parameterization. Namely, for APIs which allow specification of axes, common convention is to useaxisoraxes. Furthermore, prior art (NumPy) used0and1as the default axes, which runs counter to the current prevalent practice of batching along the last (innermost) two dimensions.gh-215 proposed changing the defaults to
-2and-1, respectively. Subsequent discussion (both in gh-215 and in consortium meeting 2021-07-29) contended that they should be removed altogether.This PR follows consensus found in the consortium meeting to simply remove the
axisNkeyword arguments. If future needs arise to specify axes in the future, such additions can be made to the specification in a future revision.