@property<EOL><INDENT>def L(self):<DEDENT>
m = len(self._tril1[<NUM_LIT:0>])<EOL>self._L[self._tril1] = self._Lu.value[:m]<EOL>self._L[self._diag] = exp(self._Lu.value[m:])<EOL>return self._L<EOL>
Lower-triangular matrix L such that K = LLᵀ + ϵI.

Returns
-------
L : (d, d) ndarray
    Lower-triangular matrix.