Update config.json

config.json

@@ -33,6 +33,9 @@
   "use_cache": true,
   "vocab_size": 32103,
   "num_beams": 6,
+  "num_beam_groups": 3,
   "min_length": 75,
-  "max_length": 142
+  "max_length": 142,
+  "no_repeat_ngram_size": 3,
+  "length_penalty": 1 
 }