made "interface" abstract

Application/Classifiers/ClassifierInterface.py

@@ -1,6 +1,8 @@
+from abc import ABC, abstractmethod
 
-
-class ClassifierInterface:
+class ClassifierInterface(ABC):
+    @abstractmethod
     def tagLayer(self, layers):
-        """takes layers, returns list (len(), same as input) of lists with tags for corresponfing layers"""
-        pass
+        """takes filled contours of one frame, returns list (len(), same as input) 
+        of lists with tags for corresponfing contours"""
+        pass