Update model_translation.py

model_translation.py

@@ -48,7 +48,7 @@ class ModelM2M100(metaclass=Singleton):
 class ModelMADLAD(metaclass=Singleton):
     """Loads an instance of the Google MADLAD model (3B).
     """
-    def __init__(self, model_name):
+    def __init__(self):
         self._model_name = "google/madlad400-3b-mt"
         self._tokenizer = AutoTokenizer.from_pretrained(
             self.model_name, use_fast=True