Update generation_config.json

generation_config.json

@@ -2,6 +2,7 @@
   "_from_model_config": true,
   "bos_token_id": 1,
   "eos_token_id": 2,
+  "pad_token_id":2,
   "transformers_version": "4.38.1",
   "use_cache": false
 }