docstr: Two mixtures of 3 beta distributions.
docstr_tok: ["Two","mixtures","of","3","beta","distributions","."]
code: def test_batch_beta(self):
      """Two mixtures of 3 beta distributions."""
      probs = np.array([[0.2, 0.3, 0.5], [0.2, 0.3, 0.5]], np.float32)
      conc1 = np.array([[2.0, 0.5], [1.0, 1.0], [0.5, 2.0]], np.float32)
      conc0 = conc1 + 2.0
  
      # self._test(probs, {'concentration1': conc1, 'concentration0': conc0},
      #            Beta)
      self.assertRaises(
          NotImplementedError,
          self._test,
          probs,
          {"concentration1": conc1, "concentration0": conc0},
          Beta,
      )
  
file_path: edward/tests/models/param_mixture_stats_test.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import edward
  import numpy
  import tensorflow
  from edward.models import Beta, Normal, ParamMixture
label_desc: Use image node_id 4 for calling the test_param_mixture_class obj's underlying member method code with example usage: obj.test_batch_beta() without return types