code: def test_monte_carlo_bias_is_zero(self):
      (bias, _) = estimate_advantage_bias_and_variance(
          advantages.monte_carlo, margin=3
      )
      np.testing.assert_allclose(bias, 0, atol=0.1)
  
file_path: trax/trax/rl/advantages_test.py
imports: import functools
  from absl.testing import absltest
  from absl.testing import parameterized
  import numpy
  from trax.rl import advantages
label_desc: Use image node_id 2 for calling the AdvantagesTest obj's underlying member method code with example usage: obj.test_monte_carlo_bias_is_zero() without return types