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numpy.tril_indices_from
numpy.tril_indices_from(arr, k=0)[source]- 
    
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
Notes
New in version 1.4.0.
 - 
           
 
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 https://docs.scipy.org/doc/numpy-1.16.1/reference/generated/numpy.tril_indices_from.html