Add default generation params

generation_config.json

@@ -4,5 +4,8 @@
   "eos_token_id": 1,
   "pad_token_id": 0,
   "temperature": 1.0,
+  "do_sample": true,
+  "top_k": 64,
+  "top_p": 0.95,
   "transformers_version": "5.3.0.dev0"
 }