fix circular import

Author: pintaoz

src/sagemaker/amazon/common.py

@@ -16,7 +16,9 @@
 # these imports ensure backward compatibility.
 from sagemaker.deserializers import RecordDeserializer  # noqa: F401 # pylint: disable=W0611
 from sagemaker.serializers import RecordSerializer  # noqa: F401 # pylint: disable=W0611
-from sagemaker.serializer_utils import (
+from sagemaker.serializer_utils import (  # noqa: F401 # pylint: disable=W0611
+    read_recordio,
+    read_records,
     write_numpy_to_dense_tensor,
     write_spmatrix_to_sparse_tensor,
-)  # noqa: F401 # pylint: disable=W0611
+)

src/sagemaker/base_deserializers.py

@@ -23,7 +23,7 @@
 import numpy as np
 from six import with_metaclass
 
-from sagemaker.amazon.common import read_records
+from sagemaker.serializer_utils import read_records
 from sagemaker.utils import DeferredError
 
 try: