code: def setUp(self):
      self.batch_size = 2
      self.num_actions = 3
      self.logits = paddle.rand(
          shape=(self.batch_size, self.num_actions)
      )
      self.dist = CategoricalDistribution(self.logits)
  
imports: import random
  import numpy
  import paddle
  import unittest
  import copy
  from parl.core.paddle.policy_distribution import DiagGaussianDistribution, CategoricalDistribution, SoftCategoricalDistribution
label_desc: Use image node_id 1 for calling the CategoricalDistributionTest obj's underlying member method code with example usage: obj.setUp() without return types