human
Solve the following python programming problem given the following code:
def test_diagonal() : 
    def fun(D) : 
        return to_scalar (np.diagonal (D, axis1 = (- 1), axis2 = (- 2))) 
D = np.random.randn (4, 4) 
    A = np.make_diagonal (D, axis1 = (- 1), axis2 = (- 2)) 
    check_grads (fun, D) 
    D = np.random.randn (3, 4, 4) 
    A = np.make_diagonal (D, axis1 = (- 1), axis2 = (- 2)) 
    check_grads (fun, A) 

    
    

    Fix the buggy line: check_grads (fun, A)
assistant
#Here is Python program to fix the buggy line: check_grads (fun, A)
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check_grads (fun, D)