diff --git a/app/api/views/upload/catalog.py b/app/api/views/upload/catalog.py
index dbff9e40..7a97e9af 100644
--- a/app/api/views/upload/catalog.py
+++ b/app/api/views/upload/catalog.py
@@ -4,8 +4,8 @@ from typing import Dict, List, Type
 from pydantic import BaseModel
 from typing_extensions import Literal
 
-from . import examples
 from ...models import DOCUMENT_CLASSIFICATION, SEQ2SEQ, SEQUENCE_LABELING
+from . import examples
 
 
 class Format:
diff --git a/app/api/views/upload/dataset.py b/app/api/views/upload/dataset.py
index 4cf75207..45870e3e 100644
--- a/app/api/views/upload/dataset.py
+++ b/app/api/views/upload/dataset.py
@@ -3,7 +3,7 @@ import json
 from typing import Dict, Iterator, List, Optional, Type
 
 import pyexcel
-from seqeval.scheme import IOB2, IOE2, IOBES, BILOU, Tokens
+from seqeval.scheme import BILOU, IOB2, IOBES, IOE2, Tokens
 
 from .data import BaseData
 from .exception import FileParseException