Set tokenizer "model_max_length" property to 16384

tokenizer_config.json

@@ -312,7 +312,7 @@
   "eos_token": "<\\s>",
   "extra_special_tokens": {},
   "mask_token": "<mask>",
-  "model_max_length": 1024,
+  "model_max_length": 16384,
   "pad_token": "<pad>",
   "sep_token": "<sep>",
   "strip_accents": null,