[model_cards] Facebook: add thumbnail

model_cards/facebook/bart-large-cnn/README.md

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 - summarization
 
 license: mit
+thumbnail: https://huggingface.co/front/thumbnails/facebook.png
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model_cards/facebook/bart-large-mnli/README.md

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 ---
 license: mit
+thumbnail: https://huggingface.co/front/thumbnails/facebook.png
 ---

model_cards/facebook/bart-large/README.md

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+---
+license: mit
+thumbnail: https://huggingface.co/front/thumbnails/facebook.png
+---
+
 The Bart model was proposed by Mike Lewis, Yinhan Liu, Naman Goyal, Marjan Ghazvininejad, Abdelrahman Mohamed, Omer Levy, Ves Stoyanov and Luke Zettlemoyer on 29 Oct, 2019. According to the abstract,
 
 Bart uses a standard seq2seq/machine translation architecture with a bidirectional encoder (like BERT) and a left-to-right decoder (like GPT).

model_cards/facebook/rag-sequence-base/README.md

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+---
+license: apache-2.0
+thumbnail: https://huggingface.co/front/thumbnails/facebook.png
+---
 ## RAG
 
 This is a non-finetuned version of the RAG-Sequence model of the the paper [Retrieval-Augmented Generation for Knowledge-Intensive NLP Tasks](https://arxiv.org/pdf/2005.11401.pdf) 

model_cards/facebook/rag-sequence-nq/README.md

@@ -3,6 +3,7 @@ language: en
 license: apache-2.0
 datasets:
 - wiki_dpr
+thumbnail: https://huggingface.co/front/thumbnails/facebook.png
 ---
 ## RAG
 

model_cards/facebook/rag-token-base/README.md

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+---
+language: en
+license: apache-2.0
+datasets:
+- wiki_dpr
+thumbnail: https://huggingface.co/front/thumbnails/facebook.png
+---
 ## RAG
 
 This is a non-finetuned version of the RAG-Token model of the the paper [Retrieval-Augmented Generation for Knowledge-Intensive NLP Tasks](https://arxiv.org/pdf/2005.11401.pdf) 

model_cards/facebook/rag-token-nq/README.md

@@ -3,6 +3,7 @@ language: en
 license: apache-2.0
 datasets:
 - wiki_dpr
+thumbnail: https://huggingface.co/front/thumbnails/facebook.png
 ---
 ## RAG
 

model_cards/facebook/wmt19-de-en/README.md

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-
 ---
 language: 
 - de
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 - wmt19
 metrics:
 - bleu
+thumbnail: https://huggingface.co/front/thumbnails/facebook.png
 ---
 
 # FSMT

model_cards/facebook/wmt19-en-de/README.md

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-
 ---
 language: 
 - en
@@ -13,6 +12,7 @@ datasets:
 - wmt19
 metrics:
 - bleu
+thumbnail: https://huggingface.co/front/thumbnails/facebook.png
 ---
 
 # FSMT

model_cards/facebook/wmt19-en-ru/README.md

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-
 ---
 language: 
 - en
@@ -13,6 +12,7 @@ datasets:
 - wmt19
 metrics:
 - bleu
+thumbnail: https://huggingface.co/front/thumbnails/facebook.png
 ---
 
 # FSMT

model_cards/facebook/wmt19-ru-en/README.md

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-
 ---
 language: 
 - ru
@@ -13,6 +12,7 @@ datasets:
 - wmt19
 metrics:
 - bleu
+thumbnail: https://huggingface.co/front/thumbnails/facebook.png
 ---
 
 # FSMT