human
Solve the following python programming problem given the following code:
def EM(init_params, data, callback = None) : 
    def EM_update(params) : 
        natural_params = map (np.log, params) 
        (loglike, E_stats) = vgrad (log_partition_function) (natural_params, data) 
        if callback : 
            callback (loglike, params) 
return map (normalize, E_stats) 
def fixed_point(f, x0) : 
        x1 = f (x0) 
        while different (x0, x1) : 
            (x0, x1) = (x1, f (x1)) 
return x1 
def different(params1, params2) : 
        allclose = partial (np.allclose, atol = 0.001, rtol = 0.001) 
        return (not all (map (allclose, params1, params2))) 
return fixed_point (data, init_params) 

    
    

    Fix the buggy line: return fixed_point (data, init_params)
assistant
#Here is Python code to fix the buggy line: return fixed_point (data, init_params)
.

return fixed_point (def EM_update(, init_params)