diff --git a/docs/component/data.rst b/docs/component/data.rst
index 3cee803e6..0a650c523 100644
--- a/docs/component/data.rst
+++ b/docs/component/data.rst
@@ -396,8 +396,7 @@ The ``DatasetH`` class is the `dataset` with `Data Handler`. Here is the most im
 API
 ---------
 
-To know more about ``Dataset``, please refer to `Dataset API <../reference/api.html#module-qlib.data.dataset.__init__>`_.
-
+To know more about ``Dataset``, please refer to `Dataset API <../reference/api.html#dataset>`_.
 
 
 Cache
diff --git a/qlib/contrib/backtest/position.py b/qlib/contrib/backtest/position.py
index 97abc2a56..09313f933 100644
--- a/qlib/contrib/backtest/position.py
+++ b/qlib/contrib/backtest/position.py
@@ -1,10 +1,10 @@
 # Copyright (c) Microsoft Corporation.
 # Licensed under the MIT License.
 
-
-import pandas as pd
 import copy
 import pathlib
+import pandas as pd
+import numpy as np
 from .order import Order
 
 """