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[WIP] xt::linalg::kron: support arguments of arbitrary number of dimensions #198

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[WIP] xt::linalg::kron: support arguments of arbitrary number of dimensions #198

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Commits on May 17, 2021

  1. xt::linalg::kron: support arguments of arbitrary number of dimensions 

    Before this commit, `xt::linalg::kron` only supports 2D arguments.  This
commit proposes to add support for argument with any number of
dimensions.  This change of behavior is coherent with what `numpy.kron`
does.

The current implementation is a performance step back compared to the
previous one.  Until a better generic implementation is found, keeping a
couple of specialized implementations for the most used scenarios makes
sense.

Tested with `./test/test_xtensor_blas --gtest_filter=xlinalg.kron*`.
    @lsix
    lsix committed May 17, 2021
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