diff a/ppocr/data/imaug/label_ops.py b/ppocr/data/imaug/label_ops.py	(rejected hunks)
@@ -58,17 +72,24 @@ class DetLabelEncode(object):
             txts.append(txt)
             if txt in ['*', '###']:
                 txt_tags.append(True)
+                if self.num_classes > 1:
+                    classes.append(-2)
             else:
                 txt_tags.append(False)
+                if self.num_classes > 1:
+                    classes.append(int(self.label_list.index(txt)))
         if len(boxes) == 0:
             return None
         boxes = self.expand_points_num(boxes)
         boxes = np.array(boxes, dtype=np.float32)
         txt_tags = np.array(txt_tags, dtype=np.bool)
+        classes = classes
 
         data['polys'] = boxes
         data['texts'] = txts
         data['ignore_tags'] = txt_tags
+        if self.num_classes > 1:
+            data['classes'] = classes
         return data
 
     def order_points_clockwise(self, pts):