code: def testMeanAllowNanStatsIsFalseRaisesWhenBatchMemberIsUndefined(
      self,
  ):
      mu = [1.0, 3.3, 4.4]
      student = student_t.StudentT(
          df=[0.5, 5.0, 7.0],
          loc=mu,
          scale=[3.0, 2.0, 1.0],
          allow_nan_stats=False,
      )
      with self.assertRaisesOpError("x < y"):
          self.evaluate(student.mean())
  
imports: import importlib
  import math
  import numpy
  from tensorflow.python.eager import backprop
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import random_seed
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import nn_ops
  from tensorflow.python.ops.distributions import student_t
  from tensorflow.python.platform import test
  from tensorflow.python.platform import tf_logging
label_desc: Use image node_id 13 for calling the StudentTTest obj's underlying member method code with example usage: obj.testMeanAllowNanStatsIsFalseRaisesWhenBatchMemberIsUndefined() without return types