# skfolio.utils.stats.assert_is_symmetric ### skfolio.utils.stats.assert_is_symmetric(x, \*, rtol=1e-05, atol=1e-08) Raises an error if the matrix is not symmetric. * **Parameters:** **x** *ndarray of shape (n, m)* : The matrix. **rtol** *float, default=1e-5* : Relative tolerance for `numpy.allclose`. **atol** *float, default=1e-8* : Absolute tolerance for `numpy.allclose`. * **Raises:** ValueError: if the matrix is not symmetric.