code: def test_no_inputs(self):
      running_mean = sample_stats.RunningMean.from_shape(shape=())
      mean = self.evaluate(running_mean.mean)
      self.assertEqual(0, mean)
  
imports: from absl.testing import parameterized
  import numpy
  import scipy.stats
  import tensorflow.compat.v2
  from tensorflow_probability.python.experimental.stats import sample_stats
  from tensorflow_probability.python.internal import test_util
  from tensorflow_probability.python.mcmc import diagnostic
label_desc: Use image node_id 6 for calling the RunningMeanTest obj's underlying member method code with example usage: obj.test_no_inputs() without return types