message: Fix merge artifacts: replace Dataset by DatasetSource in Ignite Dataset.
diff: @@ -688,7 +688,7 @@ class IgniteClient(TcpClient):
  "Unknown binary type when expected string [type_id=%d]" % header)
  -class IgniteDataset(dataset_ops.Dataset):
  +class IgniteDataset(dataset_ops.DatasetSource):
  """Apache Ignite is a memory-centric distributed database, caching, and
  processing platform for transactional, analytical, and streaming workloads,
  