docstr: Mixture of 3 beta distributions.
docstr_tok: ["Mixture","of","3","beta","distributions","."]
code: def test_beta(self):
      """Mixture of 3 beta distributions."""
      probs = np.array([0.2, 0.3, 0.5], np.float32)
      conc1 = np.array([2.0, 1.0, 0.5], np.float32)
      conc0 = conc1 + 2.0
  
      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 3 for calling the test_param_mixture_class obj's underlying member method code with example usage: obj.test_beta() without return types