code: def testModeInvalid(self):
      alpha = np.array([1.0, 2, 3])
      dirichlet = dirichlet_lib.Dirichlet(
          concentration=alpha, allow_nan_stats=False
      )
      with self.assertRaisesOpError("Condition x < y.*"):
          self.evaluate(dirichlet.mode())
  
imports: import importlib
  import numpy
  from tensorflow.python.eager import backprop
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import tensor_shape
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops.distributions import dirichlet
  from tensorflow.python.ops.distributions import kullback_leibler
  from tensorflow.python.platform import test
  from tensorflow.python.platform import tf_logging
label_desc: Use image node_id 17 for calling the DirichletTest obj's underlying member method code with example usage: obj.testModeInvalid() without return types