feat(tn): remove_erhua (#149)

Author: xingchensong

tn/chinese/normalizer.py

@@ -36,12 +36,14 @@ def __init__(self,
                  cache_dir=None,
                  overwrite_cache=False,
                  remove_interjections=True,
+                 remove_erhua=True,
                  traditional_to_simple=True,
                  remove_puncts=False,
                  full_to_half=True,
                  tag_oov=False):
         super().__init__(name='normalizer')
         self.remove_interjections = remove_interjections
+        self.remove_erhua = remove_erhua
         self.traditional_to_simple = traditional_to_simple
         self.remove_puncts = remove_puncts
         self.full_to_half = full_to_half
@@ -81,7 +83,7 @@ def build_verbalizer(self):
         money = Money().verbalizer
         sport = Sport().verbalizer
         time = Time().verbalizer
-        whitelist = Whitelist().verbalizer
+        whitelist = Whitelist(remove_erhua=self.remove_erhua).verbalizer
 
         verbalizer = (cardinal | char | date | fraction | math | measure
                       | money | sport | time | whitelist).optimize()

tn/chinese/rules/whitelist.py

@@ -20,8 +20,9 @@
 
 class Whitelist(Processor):
 
-    def __init__(self):
+    def __init__(self, remove_erhua=True):
         super().__init__(name='whitelist')
+        self.remove_erhua = remove_erhua
         self.build_tagger()
         self.build_verbalizer()
 
@@ -35,5 +36,9 @@ def build_tagger(self):
 
     def build_verbalizer(self):
         super().build_verbalizer()
-        verbalizer = self.delete_tokens(delete('erhua: "儿"'))
+        if self.remove_erhua:
+            verbalizer = self.delete_tokens(delete('erhua: "儿"'))
+        else:
+            verbalizer = self.delete_tokens(delete('erhua: \"') +
+                                            accep('儿') + delete('\"'))
         self.verbalizer |= verbalizer

tn/main.py

@@ -30,7 +30,10 @@ def main():
                         help='rebuild *.fst')
     parser.add_argument('--remove_interjections', type=str,
                         default='True',
-                        help='remove interjections like "啊" and "儿"')
+                        help='remove interjections like "啊"')
+    parser.add_argument('--remove_erhua', type=str,
+                        default='True',
+                        help='remove "儿"')
     parser.add_argument('--traditional_to_simple', type=str,
                         default='True',
                         help='i.e., "喆" -> "哲"')
@@ -48,6 +51,7 @@ def main():
     normalizer = Normalizer(cache_dir=args.cache_dir,
                             overwrite_cache=args.overwrite_cache,
                             remove_interjections=str2bool(args.remove_interjections),
+                            remove_erhua=str2bool(args.remove_erhua),
                             traditional_to_simple=str2bool(args.traditional_to_simple),
                             remove_puncts=str2bool(args.remove_puncts),
                             full_to_half=str2bool(args.full_to_half),