Update config.json

Add `num_beams: 5` and `no_repeat_ngram_size: 3` to the config as defaults. Like `allenai/PRIMERA-multinews` and `allenai/PRIMERA-multixscience`, this are required to get scores closer to the scores reported in the original PRIMERA paper.

config.json

@@ -73,6 +73,8 @@
   "model_type": "led",
   "normalize_before": false,
   "normalize_embedding": true,
+  "num_beams": 5,
+  "no_repeat_ngram_size": 3,
   "num_hidden_layers": 12,
   "output_past": false,
   "pad_token_id": 1,