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docs/pytorch_project_convertor/API_docs/README.md

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 本文档梳理了常用PyTorch 1.8.1 API与PaddlePaddle 2.0.0 API对应关系和差异分析。根据文档对应关系，有PyTorch使用经验的用户，可根据对应关系，快速熟悉PaddlePaddle的API使用。
 | 类别         | 简介 |
 | ---------- | ------------------------- |
-| [基础操作类](./ops/README.md) | 主要为`torch.XX`类API |
-| [组网类](./nn/README.md)    | 主要为`torch.nn.XX`类下组网相关的API |
-| [Loss类](./loss/README.md) |主要为`torch.nn.XX`类下loss相关的API    |
-|  [工具类](./utils/README.md)   | 主要为`torch.nn.XX`类下分布式相关的API和`torch.utils.XX`类API|
-|   [视觉类](./vision/README.md)  | 主要为`torchvision.XX`类API |
+| [基础操作类](https://github.com/PaddlePaddle/X2Paddle/tree/develop/docs/pytorch_project_convertor/API_docs/ops/README.md) | 主要为`torch.XX`类API |
+| [组网类](https://github.com/PaddlePaddle/X2Paddle/tree/develop/docs/pytorch_project_convertor/API_docs/nn/README.md)    | 主要为`torch.nn.XX`类下组网相关的API |
+| [Loss类](https://github.com/PaddlePaddle/X2Paddle/tree/develop/docs/pytorch_project_convertor/API_docs/loss/README.md) |主要为`torch.nn.XX`类下loss相关的API    |
+|  [工具类](https://github.com/PaddlePaddle/X2Paddle/tree/develop/docs/pytorch_project_convertor/API_docs/utils/README.md)   | 主要为`torch.nn.XX`类下分布式相关的API和`torch.utils.XX`类API|
+|   [视觉类](https://github.com/PaddlePaddle/X2Paddle/tree/develop/docs/pytorch_project_convertor/API_docs/vision/README.md)  | 主要为`torchvision.XX`类API |