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
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The indices will be valid for square arrays whose dimensions are the same as arr. 
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k : int, optional
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Diagonal offset (see trilfor details).
 See also NotesNew in version 1.4.0. 
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Licensed under the 3-clause BSD License.
    https://docs.scipy.org/doc/numpy-1.16.1/reference/generated/numpy.tril_indices_from.html