numpy.diag_indices_from
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numpy.diag_indices_from(arr)[source]
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Return the indices to access the main diagonal of an n-dimensional array. See diag_indicesfor full details.Parameters: arr : array, at least 2-D See also NotesNew in version 1.4.0. 
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    https://docs.scipy.org/doc/numpy-1.11.0/reference/generated/numpy.diag_indices_from.html