human
Solve the following python programming problem given the following code:
@ pytest.mark.skipif ('YT_VERSION is None or YT_VERSION < 3') 
def test_from_yt(tmpdir) : 
    from yt import load 
    ds = load (os.path.join (DATA, 'DD0010', 'moving7_0010')) 
    def _dust_density(field, data) : 
        return (data ['density'].in_units ('g/cm**3') * 0.01) 
ds.add_field (('gas', 'dust_density'), function = _dust_density, units = 'g/cm**3') 
    amr = AMRGrid.from_yt (ds, quantity_mapping = { 
        'density' : ('gas', 'dust_density'), 
}) 
    m = Model () 
    m.set_amr_grid (ds) 
    m.add_density_grid (amr ['density'], get_realistic_test_dust ()) 
    s = m.add_point_source () 
    s.luminosity = 1000 
    s.temperature = 1000 
    m.set_n_initial_iterations (3) 
    m.set_n_photons (initial = 100000.0, imaging = 0) 
    m.set_propagation_check_frequency (1) 
    m.set_copy_input (False) 
    input_file = tmpdir.join ('test.rtin').strpath 
    output_file = tmpdir.join ('test.rtout').strpath 
    m.write (input_file) 
    m.run (output_file) 

    
    

    Fix the buggy line: m.set_amr_grid (ds)
assistant
#Here is Python program to fix the buggy line: m.

m.set_amr_grid (amr)