Add evaluation results on the default config of xsum

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Your model has been evaluated on the default config of the [xsum](https://huggingface.co/datasets/xsum) dataset by

@pszemraj
, using the predictions stored [here](https://huggingface.co/datasets/autoevaluate/autoeval-staging-eval-xsum-default-6f5db0-14615984).\
Accept this pull request to see the results displayed on the [Hub leaderboard](https://huggingface.co/spaces/autoevaluate/leaderboards?dataset=xsum).\
Evaluate your model on more datasets [here](https://huggingface.co/spaces/autoevaluate/model-evaluator?dataset=xsum).

README.md

@@ -82,6 +82,39 @@ model-index:
       type: gen_len
       value: 157.3126
       verified: true
+  - task:
+      type: summarization
+      name: Summarization
+    dataset:
+      name: xsum
+      type: xsum
+      config: default
+      split: test
+    metrics:
+    - name: ROUGE-1
+      type: rouge
+      value: 18.2975
+      verified: true
+    - name: ROUGE-2
+      type: rouge
+      value: 2.6806
+      verified: true
+    - name: ROUGE-L
+      type: rouge
+      value: 11.9453
+      verified: true
+    - name: ROUGE-LSUM
+      type: rouge
+      value: 14.2121
+      verified: true
+    - name: loss
+      type: loss
+      value: 4.836681365966797
+      verified: true
+    - name: gen_len
+      type: gen_len
+      value: 96.2584
+      verified: true
 ---