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
 - 
- 
arrarray_like - 
The indices will be valid for square arrays whose dimensions are the same as arr.
 - 
kint, optional - 
Diagonal offset (see
trilfor details). 
 - 
 
See also
Notes
New in version 1.4.0.
 
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    https://numpy.org/doc/1.19/reference/generated/numpy.tril_indices_from.html