Update README.md

README.md

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 ## Model description
-GPT2 is a large transformer-based language model. It is built using transformer decoder blocks. BERT, on the other hand, uses transformer encoder blocks. It adds Layer normalisation to the input of each sub-block, similar to a pre-activation residual networks and additional layer normalisation.  
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 Paper link : [A ConvNet for the 2020s](https://arxiv.org/pdf/2201.03545.pdf)