Update preparation.md

docs/guidance/preparation.md

@@ -8,7 +8,7 @@ conda create -n simswap python=3.6
 conda activate simswap
 conda install pytorch==1.8.0 torchvision==0.9.0 torchaudio==0.8.0 cudatoolkit=10.2 -c pytorch
 (option): pip install --ignore-installed imageio
-pip install insightface==0.2.1 onnxruntime-gpu moviepy
+pip install insightface==0.2.1 onnxruntime moviepy
 (option): pip install onnxruntime-gpu  (If you want to reduce the inference time)(It will be diffcult to install onnxruntime-gpu , the specify version of onnxruntime-gpu may depends on your machine and cuda version.)
 ```
 - ***We have now updated the prepare document. The main change gpu version of onnx is supported now. If you have configured the environment before, now use pip install onnxruntime-gpu ,You can increase the computing speed.***