The SDK only supports python3.6 or python3.8, here is an example of creating a virtual environment for python3.8.

Install python packages.

sudo apt update
sudo apt install python3-dev python3-numpy

Follow this docs to install conda.

Then create a virtual environment.

conda create -n npu-env python=3.8
conda activate npu-env     #activate
conda deactivate           #deactivate

After creating the virtual environment, start the virtual environment and start the next step.

Clone SDK from Rockchip Github.

git clone https://github.com/rockchip-linux/rknn-toolkit2.git
git checkout 9ad79343fae625f4910242e370035fcbc40cc31a

Install dependences and RKNN toolkit2 packages,

cd rknn-toolkit2
sudo apt-get install python3 python3-dev python3-pip
sudo apt-get install libxslt1-dev zlib1g-dev libglib2.0 libsm6 libgl1-mesa-glx libprotobuf-dev gcc cmake
pip3 install -r doc/requirements_cp38-*.txt
pip3 install packages/rknn_toolkit2-*-cp38-cp38-linux_x86_64.whl

Choose RK3588S,

diff --git a/examples/onnx/yolov5/test.py b/examples/onnx/yolov5/test.py
index a1c9988..f7ce11e 100644
--- a/examples/onnx/yolov5/test.py
+++ b/examples/onnx/yolov5/test.py
@@ -240,7 +240,7 @@ if __name__ == '__main__':
 
     # pre-process config
     print('--> Config model')
-    rknn.config(mean_values=[[0, 0, 0]], std_values=[[255, 255, 255]])
+    rknn.config(mean_values=[[0, 0, 0]], std_values=[[255, 255, 255]], target_platform='rk3588')
     print('done')
 
     # Load ONNX model
 

Convert yolov5 as a example,

cd examples/onnx/yolov5/
python3 test.py

After convert, it will generate the rknn file yolov5s.rknn.

$ ls
bus.jpg  dataset.txt  onnx_yolov5_0.npy  onnx_yolov5_1.npy  onnx_yolov5_2.npy  test.py  yolov5s.onnx  yolov5s.rknn

For more usage, please refer to the related documents under doc.