Update README.md

README.md

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 license: apache-2.0
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+
+HF-version model for PRIMERA: Pyramid-based Masked Sentence Pre-training for Multi-document Summarization (ACL 2022). 
+
+The original code can be found [here](https://github.com/allenai/PRIMER). You can find the script and notebook to train/evaluate the model in the original github repo.
+
+* Note: due to the difference between the implementations of the original Longformer and the Huggingface LED model, the results of converted models are slightly different. We run a sanity check on both fine-tuned and non fine-tuned models, and show the results below:
+
+| Model | Rouge-1 | Rouge-2 | Rouge-L |
+| --- | ----------- |----------- |----------- |
+| PRIMERA | 42.0 | 13.6 | 20.8| 
+| PRIMERA-hf | 41.7 |13.6 | 20.5|
+| PRIMERA(finetuned) | 49.9 | 21.1 | 25.9|
+| PRIMERA-hf(finetuned) | 49.9 | 20.9 | 25.8|
+
+You can use it by 
+```
+from transformers import (
+    AutoTokenizer,
+    LEDConfig,
+    LEDForConditionalGeneration,
+)
+tokenizer = AutoTokenizer.from_pretrained('allenai/PRIMERA')
+config=LEDConfig.from_pretrained('allenai/PRIMERA')
+model = LEDForConditionalGeneration.from_pretrained('allenai/PRIMERA')
+```