adjust data and model interface

qlib/contrib/online/__init__.py

@@ -0,0 +1,18 @@
+'''
+TODO:
+
+- Online needs that the model have such method
+    def get_data_with_date(self, date, **kwargs):
+        """
+        Will be called in online module
+        need to return the data that used to predict the label (score) of stocks at date.
+
+        :param
+            date: pd.Timestamp
+                predict date
+        :return:
+            data: the input data that used to predict the label (score) of stocks at predict date.
+        """
+        raise NotImplementedError("get_data_with_date for this model is not implemented.")
+
+'''