Update vision_encoder_decoder_blog.md

vision_encoder_decoder_blog.md

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 | <img src="https://raw.githubusercontent.com/ydshieh/notebooks/master/images/bert-gpt-bart.JPG" alt="drawing" width="400"/> | 
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 | Figure 3: The 3 pretraining paradigms for Transformer models [<sup>[4]</sup>](https://arxiv.org/abs/1810.04805) [<sup>[5]</sup>](https://openai.com/blog/language-unsupervised/) [<sup>[6]</sup>](https://arxiv.org/abs/1910.13461)|
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 In 2020, the paper [Leveraging Pre-trained Checkpoints for Sequence Generation Tasks](https://arxiv.org/abs/1907.12461) studied the effectiveness of initializing sequence-to-sequence models with pretrained encoder/decoder checkpoints for sequence generation tasks. It obtained new state-of-the-art results on machine translation, text summarization, etc.