human
Solve the following python programming problem given the following code:
def _create_interp(self, verts, bhsolver = None) : 
    'Creates interpolator that will interpolate values at the given `verts` using
        biharmonic interpolation.

        Parameters
        ----------
        verts : 1D array-like of ints
            Indices of vertices that will serve as knot points for interpolation.
        bhsolver : (lhs, rhs, Dinv, lhsfac, notboundary), optional
            A 5-tuple representing a biharmonic equation solver. This structure
            is created by _create_biharmonic_solver.
        
        Returns
        -------
        _interp : function
            Function that will interpolate a given set of values across the surface.
            The values can be 1D or 2D (number of dimensions by len `verts`). Any
            number of dimensions can be interpolated simultaneously.
        ' 
    if (bhsolver is None) : 
        (lhs, D, Dinv, lhsfac, notb) = self._create_biharmonic_solver (self) 
else : 
        (lhs, D, Dinv, lhsfac, notb) = bhsolver 
npt = len (D) 
    def _interp(vals) : 
        'Interpolate function with values `vals` at the knot points.' 
        v2 = np.atleast_2d (vals) 
        (nd, nv) = v2.shape 
        ij = np.zeros ((2, (nv * nd))) 
        ij [0] = np.array (verts) [np.repeat (np.arange (nv), nd)] 
        ij [1] = np.tile (np.arange (nd), nv) 
        r = sparse.csr_matrix ((vals.T.ravel (), ij), shape = (npt, nd)) 
        vr = lhs.dot (r) 
        phi = lhsfac.solve_A ((- vr [notb].todense ())) 
        tphi = np.zeros ((npt, nd)) 
        tphi [notb] = phi 
        tphi [verts] = v2.T 
        return tphi 
return _interp 

    
    

    Fix the buggy line: (lhs, D, Dinv, lhsfac, notb) = self._create_biharmonic_solver (self)
assistant
#Here is Python program to fix the buggy line: (lhs, D, Dinv, lhsfac, notb) = self.

(lhs, D, Dinv, lhsfac, notb) = self._create_biharmonic_solver (verts)