numpy.triu_indices_from
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numpy.triu_indices_from(arr, k=0)[source]
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Return the indices for the upper-triangle of arr. See triu_indicesfor full details.Parameters: arr : ndarray, shape(N, N) The indices will be valid for square arrays. k : int, optional Diagonal offset (see triufor details).Returns: triu_indices_from : tuple, shape(2) of ndarray, shape(N) Indices for the upper-triangle of arr.See also NotesNew in version 1.4.0. 
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    https://docs.scipy.org/doc/numpy-1.11.0/reference/generated/numpy.triu_indices_from.html