fix feature file path bug

ml/feature.py

@@ -6,7 +6,8 @@
 class Feature(ABC):
     def __init__(self, name="", identifier=""):
         self.__name = name
-        if "ml/fml40" in sys.modules[self.__class__.__module__].__file__:
+        path = sys.modules[__name__].__file__ if __name__ == "__main__" else __file__
+        if "ml/fml40" in path:
             self.__class_name = "fml40::{}".format(self.__class__.__name__)
         else:
             self.__class_name = "ml40::{}".format(self.__class__.__name__)