def METHOD_NAME():
    ds = MyDataset()
    pars = ds.models.parameters
    factors, info, minuit = optimize_iminuit(function=ds.fcn, parameters=pars)
    assert info["success"]
    assert_allclose(ds.fcn(), 0, atol=1e-5)
    assert_allclose(pars["x"].value, 2, rtol=1e-3)
    assert_allclose(pars["y"].value, 3e5, rtol=1e-3)
    assert_allclose(pars["z"].value, 4e-5, rtol=2e-2)