Add evaluation results on the samsum config and validation split of samsum

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Your model has been evaluated on the samsum config and validation split of the [samsum](https://huggingface.co/datasets/samsum) dataset by @samuelallen123, using the predictions stored [here](https://huggingface.co/datasets/autoevaluate/autoeval-staging-eval-samsum-samsum-fbc19a-15816179).\
Accept this pull request to see the results displayed on the [Hub leaderboard](https://huggingface.co/spaces/autoevaluate/leaderboards?dataset=samsum).\
Evaluate your model on more datasets [here](https://huggingface.co/spaces/autoevaluate/model-evaluator?dataset=samsum).

README.md

@@ -104,6 +104,39 @@ model-index:
       type: gen_len
       value: 25.0234
       verified: true
+  - task:
+      type: summarization
+      name: Summarization
+    dataset:
+      name: samsum
+      type: samsum
+      config: samsum
+      split: validation
+    metrics:
+    - name: ROUGE-1
+      type: rouge
+      value: 21.9676
+      verified: true
+    - name: ROUGE-2
+      type: rouge
+      value: 4.2575
+      verified: true
+    - name: ROUGE-L
+      type: rouge
+      value: 17.3584
+      verified: true
+    - name: ROUGE-LSUM
+      type: rouge
+      value: 19.0
+      verified: true
+    - name: loss
+      type: loss
+      value: 3.033092975616455
+      verified: true
+    - name: gen_len
+      type: gen_len
+      value: 19.6956
+      verified: true
 ---
 
 ### Pegasus Models