From a72911e4f8ce7796263fd18e3a63a800a28b6cb0 Mon Sep 17 00:00:00 2001
From: you-n-g <you-n-g@users.noreply.github.com>
Date: Fri, 19 Feb 2021 20:12:03 +0800
Subject: [PATCH] Update filter.py

---
 qlib/data/filter.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/qlib/data/filter.py b/qlib/data/filter.py
index 70f9d3278..784fad8d7 100644
--- a/qlib/data/filter.py
+++ b/qlib/data/filter.py
@@ -354,7 +354,8 @@ class ExpressionDFilter(SeriesDFilter):
         rule_expression_field_name = list(_features.keys())[0]
         all_filter_series = _features[rule_expression_field_name]
         return all_filter_series
-
+    
+    @staticmethod
     def from_config(config):
         return ExpressionDFilter(
             rule_expression=config["rule_expression"],