Add evaluation results on the default config and test split of xsum

Beep boop, I am a bot from Hugging Face's automatic model evaluator 👋!\
Your model has been evaluated on the default config and test split of the [xsum](https://huggingface.co/datasets/xsum) dataset by @zuzannad1 , using the predictions stored [here](https://huggingface.co/datasets/autoevaluate/autoeval-eval-xsum-default-8e4fa8-60494145409).\
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

@@ -17,30 +17,30 @@ model-index:
       split: test
     metrics:
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-      value: 38.643
+      value: 38.6513
       name: ROUGE-1
       verified: true
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     - type: rouge
-      value: 17.7546
+      value: 17.7585
       name: ROUGE-2
       verified: true
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     - type: rouge
-      value: 32.2114
+      value: 32.2033
       name: ROUGE-L
       verified: true
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     - type: rouge
-      value: 32.2207
+      value: 32.2064
       name: ROUGE-LSUM
       verified: true
-      verifyToken: eyJhbGciOiJFZERTQSIsInR5cCI6IkpXVCJ9.eyJoYXNoIjoiNWJkMTdmYmJlMGY3ZDg0ZGU4NTk3ZDRiMTg2ODUxZjU3ODJiMGNmZGZiOGFmNDhhZmRkMTE5MTM1YTMwNDI3NiIsInZlcnNpb24iOjF9.nTXRauPJTCmm1Ed4mp4LyIaWKd0OXhK94OAZEnIpN549pMZ19ufrNTuBeXQj6vLQAsaugbrPotBXBPe-Pbp3Dg
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     - type: loss
-      value: 1.8224396705627441
+      value: 1.822434902191162
       name: loss
       verified: true
-      verifyToken: eyJhbGciOiJFZERTQSIsInR5cCI6IkpXVCJ9.eyJoYXNoIjoiZDlhYTY5MzFkOGRlNGFjOGZiYzUyYmQ3ZWViNmY2ODZiYzhjNzYyYWZlN2ViZTJiZWEyMDFlYjE0YmIyODY2YyIsInZlcnNpb24iOjF9.96OPA94rxBtQpSiEEk7hBffOa30pe1TslYE9cpZiiwQb7GOCNGeUqjxWmzE0-R1_QluMN527k0dFL1G2KWQwAA
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     - type: gen_len
       value: 19.7028
       name: gen_len