Add evaluation results on the samsum config of samsum

Beep boop, I am a bot from Hugging Face's automatic model evaluator 👋!\
Your model has been evaluated on the samsum config of the [samsum](https://huggingface.co/datasets/samsum) dataset by

@pszemraj

, using the predictions stored [here](https://huggingface.co/datasets/autoevaluate/autoeval-staging-eval-project-samsum-e4148a42-11205497).\
Accept this pull request to see the results displayed on the [Hub leaderboard](https://huggingface.co/spaces/autoevaluate/leaderboards?dataset=samsum).\
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README.md

@@ -221,19 +221,19 @@ model-index:
     metrics:
     - name: ROUGE-1
       type: rouge
-      value: 33.4238
+      value: 33.4484
       verified: true
     - name: ROUGE-2
       type: rouge
-      value: 10.3989
+      value: 10.4249
       verified: true
     - name: ROUGE-L
       type: rouge
-      value: 24.5279
+      value: 24.5802
       verified: true
     - name: ROUGE-LSUM
       type: rouge
-      value: 29.8073
+      value: 29.8226
       verified: true
     - name: loss
       type: loss