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

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Your model has been evaluated on the samsum config and train split of the [samsum](https://huggingface.co/datasets/samsum) dataset by @samuelallen123, using the predictions stored [here](https://huggingface.co/datasets/autoevaluate/autoeval-eval-samsum-samsum-61187c-1532155205).\
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

@@ -71,6 +71,39 @@ model-index:
       type: gen_len
       value: 45.928
       verified: true
+  - task:
+      type: summarization
+      name: Summarization
+    dataset:
+      name: samsum
+      type: samsum
+      config: samsum
+      split: train
+    metrics:
+    - name: ROUGE-1
+      type: rouge
+      value: 54.933
+      verified: true
+    - name: ROUGE-2
+      type: rouge
+      value: 31.7965
+      verified: true
+    - name: ROUGE-L
+      type: rouge
+      value: 47.0057
+      verified: true
+    - name: ROUGE-LSUM
+      type: rouge
+      value: 51.2027
+      verified: true
+    - name: loss
+      type: loss
+      value: 1.130684494972229
+      verified: true
+    - name: gen_len
+      type: gen_len
+      value: 23.7989
+      verified: true
 ---
 Trained on Samsum train split.