message: Call make_initializable_iterator on dataset instead of using dataset_ops
diff: @@ -23,7 +23,6 @@ import shutil
  from tensorflow_io.lmdb.python.ops import lmdb_dataset_ops
  from tensorflow.python.data.kernel_tests import test_base
  -from tensorflow.python.data.ops import dataset_ops
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  @@ -49,7 +48,7 @@ class LMDBDatasetTest(test_base.DatasetTestBase):
  num_repeats = 2
  dataset = lmdb_dataset_ops.LMDBDataset(filenames).repeat(num_repeats)
  - iterator = dataset_ops.make_initializable_iterator(dataset)
  + iterator = dataset.make_initializable_iterator(dataset)
  init_op = iterator.initializer
  get_next = iterator.get_next()
  