code: def test_get_cumulative_distributions(self) -> None:
      distr = self.aggregator.get_cumulative_distributions()
      self.assertEqual(len(distr), 3)
      self.assertEqual(distr["A"], 0.35)
      self.assertEqual(distr["B"], 0.35)
      self.assertEqual(distr["C"], 0.3)
  
file_path: ReAgent/reagent/test/core/aggregators_test.py
imports: import unittest
  import torch
  from reagent.core.aggregators import ActionCountAggregator
label_desc: Use image node_id 3 for calling the ActionCountAggregatorTest obj's underlying member method code with example usage: obj.test_get_cumulative_distributions() without return types