Update useful_tools.md

Author: Junjun2016

docs/useful_tools.md

@@ -44,7 +44,7 @@ The final output filename will be `psp_r50_512x1024_40ki_cityscapes-{hash id}.pt
 
 ### Convert to ONNX (experimental)
 
-We provide a script to convert model to [ONNX](https://github.com/onnx/onnx) format. The converted model could be visualized by tools like [Netron](https://github.com/lutzroeder/netron). Besides, we also support comparing the output results between Pytorch and ONNX model.
+We provide a script to convert model to [ONNX](https://github.com/onnx/onnx) format. The converted model could be visualized by tools like [Netron](https://github.com/lutzroeder/netron). Besides, we also support comparing the output results between PyTorch and ONNX model.
 
 ```bash
 python tools/pytorch2onnx.py \
@@ -136,7 +136,7 @@ Description of all arguments
 
 ### Convert to TorchScript (experimental)
 
-We also provide a script to convert model to [TorchScript](https://pytorch.org/docs/stable/jit.html) format. You can use the pytorch C++ API [LibTorch](https://pytorch.org/docs/stable/cpp_index.html) inference the trained model. The converted model could be visualized by tools like [Netron](https://github.com/lutzroeder/netron). Besides, we also support comparing the output results between Pytorch and TorchScript model.
+We also provide a script to convert model to [TorchScript](https://pytorch.org/docs/stable/jit.html) format. You can use the pytorch C++ API [LibTorch](https://pytorch.org/docs/stable/cpp_index.html) inference the trained model. The converted model could be visualized by tools like [Netron](https://github.com/lutzroeder/netron). Besides, we also support comparing the output results between PyTorch and TorchScript model.
 
 ```shell
 python tools/pytorch2torchscript.py \