Return collocation residuals.

        Parameters
        ----------
        coefs_array : numpy.ndarray
        basis_kwargs : dict
        problem : TwoPointBVPLike

        Returns
        -------
        resids : numpy.ndarray

def _compute_residuals(self, coefs_array, basis_kwargs, boundary_points, nodes, problem):
        """
        Return collocation residuals.

        Parameters
        ----------
        coefs_array : numpy.ndarray
        basis_kwargs : dict
        problem : TwoPointBVPLike

        Returns
        -------
        resids : numpy.ndarray

        """
        coefs_list = self._array_to_list(coefs_array, problem.number_odes)
        derivs, funcs = self._construct_approximation(basis_kwargs, coefs_list)
        resids = self._assess_approximation(boundary_points, derivs, funcs,
                                            nodes, problem)
        return resids