Add evaluation results on cnn_dailymail dataset

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

@lewtun

, using the predictions stored [here](https://huggingface.co/datasets/autoevaluate/autoeval-staging-eval-project-be45ecbd-7284773).\
Accept this pull request to see the results displayed on the [Hub leaderboard](https://huggingface.co/spaces/autoevaluate/leaderboards?dataset=cnn_dailymail).\
Evaluate your model on more datasets [here](https://huggingface.co/spaces/autoevaluate/model-evaluator?dataset=cnn_dailymail).

README.md

@@ -9,6 +9,42 @@ metrics:
 - R1
 - R2
 - RL
+model-index:
+- name: echarlaix/bart-base-cnn-r2-19.4-d35-hybrid
+  results:
+  - task:
+      type: summarization
+      name: Summarization
+    dataset:
+      name: cnn_dailymail
+      type: cnn_dailymail
+      config: 3.0.0
+      split: test
+    metrics:
+    - name: ROUGE-1
+      type: rouge
+      value: 24.2717
+      verified: true
+    - name: ROUGE-2
+      type: rouge
+      value: 11.8434
+      verified: true
+    - name: ROUGE-L
+      type: rouge
+      value: 20.1958
+      verified: true
+    - name: ROUGE-LSUM
+      type: rouge
+      value: 22.8206
+      verified: true
+    - name: loss
+      type: loss
+      value: 1.91438627243042
+      verified: true
+    - name: gen_len
+      type: gen_len
+      value: 20.0
+      verified: true
 ---
 
 ## facebook/bart-base model fine-tuned on CNN/DailyMail