Fix: set pad_token_id for correct batching/attention masking

config.json

@@ -26,5 +26,6 @@
   "transformers_version": "4.51.0",
   "use_cache": true,
   "use_sliding_window": false,
-  "vocab_size": 151936
-}
+  "vocab_size": 151936,
+  "pad_token_id": 151643
+}