Return the indices for the lower-triangle of an (n, n) array.
See tril_indices for full details.
n : int
Sets the size of the arrays for which the returned indices will be valid.
k : int, optional
Diagonal offset (see tril for details).
See also
tril_indices, tril
Notes
New in version 1.4.0.
numpy.tril_indices
numpy.triu_indices
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