human
Solve the following python programming problem given the following code:
def _fit_ellipse(self, arr) : 
    narr = normalize (arr) 
    bounds = [(10, 30), (10, 30), (3, 30), (3, 30), (0.5, 3.5), (0, 360)] 
    def fun(x) : 
        e = ellipse (20, 20, * x [2 :]).ravel ().astype (np.float) 
        norm = np.sqrt ((e ** 2).sum ()) 
        e = (ellipse (* x).ravel ().astype (np.float) / norm) 
        return (np.dot (narr, e) * (- 1)) 
x0 = self.best_match (x0) 
    result = minimize (fun, x0, bounds = bounds, approx_grad = True) 
    return (result [0], fun (result [0])) 

    
    

    Fix the buggy line: x0 = self.best_match (x0)
assistant
#Here is Python code to fix the buggy line: x0 = self.

x0 = self.best_match (narr)