add task_specific_params to config

config.json

@@ -22,5 +22,17 @@
   "pad_token_id": 0,
   "relative_attention_num_buckets": 32,
   "use_cache": true,
+  "task_specific_params": {
+    "summarization": {
+      "early_stopping": true,
+      "length_penalty": 2.0,
+      "repetition_penalty": 2.5,
+      "max_length": 100,
+      "min_length": 50,
+      "no_repeat_ngram_size": 2,
+      "num_beams": 2,
+      "prefix": "summarize: "
+    }
+  },
   "vocab_size": 32128
 }