code: def testTypeMismatch(self):
      reducer = grouping.Reducer(
          init_func=lambda x: constant_op.constant(
              1, dtype=dtypes.int32
          ),
          reduce_func=lambda x, y: constant_op.constant(
              1, dtype=dtypes.int64
          ),
          finalize_func=lambda x: x,
      )
  
      dataset = dataset_ops.Dataset.range(10)
      with self.assertRaises(TypeError):
          dataset.apply(
              grouping.group_by_reducer(lambda _: np.int64(0), reducer)
          )
  
imports: from absl.testing import parameterized
  import numpy
  from tensorflow.python.data.experimental.ops import grouping
  from tensorflow.python.data.kernel_tests import checkpoint_test_base
  from tensorflow.python.data.kernel_tests import test_base
  from tensorflow.python.data.ops import dataset_ops
  from tensorflow.python.framework import combinations
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import sparse_tensor
  from tensorflow.python.framework import tensor_shape
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 6 for calling the GroupByReducerTest obj's underlying member method code with example usage: obj.testTypeMismatch() without return types