add(Cvt): add Cvt Model for ppvit

BR-IDL / PaddleViT

:robot: PaddleViT: State-of-the-art Visual Transformer and MLP Models for PaddlePaddle 2.0+

https://github.com/BR-IDL/PaddleViT

Apache License 2.0

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Closed defensetongxue closed 2 years ago

defensetongxue commented 2 years ago

impl: "CvT: Introducing Convolutions to Vision Transformers" for ppvit reference https://github.com/microsoft/CvT

CLAassistant commented 2 years ago

All committers have signed the CLA.

xperzy commented 2 years ago

Please check the PR and make sure the code is included.