code: def test_logistic_quantizes_to_mode_decimal_part(self):
      dist = tfp.distributions.Logistic(loc=-3.0, scale=1.0)
      self.assertEqual(helpers.quantization_offset(dist), 0.0)
  
imports: import tensorflow
  import tensorflow_probability
  from tensorflow_compression.python.distributions import deep_factorized
  from tensorflow_compression.python.distributions import helpers
label_desc: Use image node_id 6 for calling the HelpersTest obj's underlying member method code with example usage: obj.test_logistic_quantizes_to_mode_decimal_part() without return types