numpy.tril_indices_from
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numpy.tril_indices_from(arr, k=0)[source]
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Return the indices for the lower-triangle of arr. See tril_indicesfor full details.Parameters: arr : array_like The indices will be valid for square arrays whose dimensions are the same as arr. k : int, optional Diagonal offset (see trilfor details).See also NotesNew in version 1.4.0. 
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    https://docs.scipy.org/doc/numpy-1.11.0/reference/generated/numpy.tril_indices_from.html