Adding rhoknp package reference

tokenization_deberta_v2_jumanpp.py

@@ -24,12 +24,13 @@ class JumanppTokenizer:
                 "You need to install rhoknp to use JumanppPreTokenizer. "
                 "See https://github.com/ku-nlp/rhoknp for installation."
             )
+        self.rhoknp = rhoknp
         self.jumanpp = rhoknp.Jumanpp()
 
     def tokenize(self, text: str) -> str:
         morphemes = self.jumanpp.apply_to_sentence(text).morphemes
         if not morphemes:
-            doc = rhoknp.Document.from_raw_text(text)
+            doc = self.rhoknp.Document.from_raw_text(text)
             morphemes = self.jumanpp.apply_to_document(doc).morphemes
         return " ".join([morpheme.surf for morpheme in morphemes])