Orientation of input axes in terms of output axes for affine
Valid for an affine transformation from m dimensions to n dimensions (affine.shape == (n+1, m+1)).
The calculated orientations can be used to transform associated arrays to best match the output orientations. If n > m, then some of the output axes should be considered dropped in this orientation.
Parameters : | affine : (n+1,m+1) ndarray-like
tol : {None, float}, optional
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Returns : | orientations : (n,2) ndarray
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