code: def test_max_as_distribution(self):
      self.assertIsInstance(
          self.qout.max_as_distribution, chainer.Variable
      )
      for b in range(self.batch_size):
          np.testing.assert_almost_equal(
              self.qout.max_as_distribution.array[b],
              self.atom_probs[b, self.qout.greedy_actions.array[b]],
          )
  
imports: import unittest
  import chainer
  import chainer.functions
  from chainer import testing
  import numpy
  from chainerrl import action_value
label_desc: Use image node_id 3 for calling the TestDistributionalDiscreteActionValue obj's underlying member method code with example usage: obj.test_max_as_distribution() without return types