human
Solve the following python programming problem given the following code:
def _create_missing_idx(nrows, ncols, density, random_state = None) : 
    if (random_state is None) : 
        random_state = np.random 
else : 
        random_state = np.random.RandomState (random_state) 
size = int (np.round ((((1 - density) * nrows) * ncols))) 
    min_rows = 5 
    fac = 1.02 
    extra_size = min ((size + min_rows), (fac * size)) 
    def _gen_unique_rand(rng, _extra_size) : 
        ind = rng.rand (int (_extra_size)) 
        return np.unique (np.floor (((ind * nrows) * ncols))) [: size] 
ind = _gen_unique_rand (random_state, density) 
    while (ind.size < size) : 
        extra_size *= 1.05 
        ind = _gen_unique_rand (random_state, extra_size) 
j = np.floor (((ind * 1.0) / nrows)).astype (int) 
    i = (ind - (j * nrows)).astype (int) 
    return (i.tolist (), j.tolist ()) 

    
    

    Fix the buggy line: ind = _gen_unique_rand (random_state, density)
assistant
#Here is Python code to fix the buggy line: ind = _gen_unique_rand (random_state, density)
.

ind = _gen_unique_rand (random_state, extra_size)