code: def testAssertsNonNegativeRate(self):
      pass
  
imports: import numpy
  from scipy import stats
  import tensorflow.compat.v2
  from tensorflow_probability.python.distributions import skellam
  from tensorflow_probability.python.internal import test_util
  from tensorflow_probability.python.math import gradient
label_desc: Use image node_id 3 for calling the SkellamLogRateTest obj's underlying member method code with example usage: obj.testAssertsNonNegativeRate() without return types