polish code

ppocr/utils/character.py

@@ -26,7 +26,7 @@ class CharacterOps(object):
         self.character_type = config['character_type']
         self.loss_type = config['loss_type']
         self.max_text_len = config['max_text_length']
-        if self.loss_type == "srn" and self.character_type == "ch":
+        if self.loss_type == "srn" and self.character_type != "en":
             raise Exception("SRN can only support in character_type == en")
         if self.character_type == "en":
             self.character_str = "0123456789abcdefghijklmnopqrstuvwxyz"