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    Home >  AI Development  >  RKNN Toolkit


Rockchip offers the RKNN-Toolkit development kit for model conversion, forward inference, and performance evaluation.

Users can easily perform the following functions through the provided Python interface:

1) Model conversion: support Caffe、Tensorflow、TensorFlow Lite、ONNX、Darknet model, support RKNN model import and export, and so the models can be loaded and used on the hardware platform.

2) forward inference: user can simulate running the model on the PC and get the inference results, and run the model on the specified hardware platform RK3399Pro/RK1808 and get the inference results.

3) performance evaluation: user can simulate running the model on a PC to get both the total time spent on the model and the time-consuming information of each layer. User can also run the model on the specified hardware platform RK3399Pro/RK1808 by online debugging, and get both the total time of the model running on the hardware and the time-consuming information of each layer.

This chapter mainly explains how to perform model conversion on the RK3399Pro/RK1808 development board. For other function descriptions, please refer to the RKNN-Toolkit User Guide.

Installation preparation

   sudo dnf install -y cmake gcc gcc-c++ protobuf-devel protobuf-compiler lapack-devel
   sudo dnf install -y python3-devel python3-opencv python3-numpy-f2py python3-h5py python3-lmdb  python3-grpcio
   pip3 install scipy-1.2.0-cp36-cp36m-linux_aarch64.whl
   pip3 install onnx-1.4.1-cp36-cp36m-linux_aarch64.whl
   pip3 install tensorflow-1.10.1-cp36-cp36m-linux_aarch64.whl

After installing the above basic package, install the rknn-toolkit wheel package. RKNN wheel package and other Python wheel packages can be downloaded from OneDrive.

Since pip does not have a ready-made aarch64 version of the scipy and onnx wheel packages, we have provided a compiled wheel package. If you want the latest version of the wheel package or find a problem with the pre-compiled wheel package, you can use pip to install it yourself. This will compile and install the wheel package. It will take a long time and you need to wait patiently.

   pip3 install scipy
   pip3 install onnx

If the installation encounters an error, please install the corresponding software package according to the error message.

Model Conversion

API call flow



  1. from rknn.api import RKNN
  3. INPUT_SIZE = 64
  5. if __name__ == '__main__':
  6.     rknn = RKNN()   # Create an RKNN execution object
  8.     '''
  9.     Configure model input for NPU preprocessing of input data
  10.     channel_mean_value='0 0 0 255', when runing forward inference, the RGB data will be
  11.     converted as follows (R - 0) / 255, (G - 0) / 255, (B - 0) / 255,
  12.     The RKNN model automatically performs the mean and normalization.
  13.     reorder_channel='0 1 2' , used to specify whether to adjust the image channel order, 
  14.     set to 0 1 2, means no adjustment according to the input image channel order.
  15.     reorder_channel='2 1 0' , indicates that 0 and 2 channels are exchanged.
  16.     If the input is RGB, it will be adjusted to BGR. If it is BGR will be adjusted to RGB
  17.     Image channel order is not adjusted
  18.     '''
  20.     rknn.config(channel_mean_value='0 0 0 255', reorder_channel='0 1 2')
  22.     '''
  23.     load TensorFlow model
  24.     tf_pb='digital_gesture.pb' specify the TensorFlow model to be converted
  25.     inputs specify the input node in the model
  26.     outputs specify the output node in the model
  27.     input_size_list specify the size of the model input
  28.     '''
  30.     print('--> Loading model')
  31.     rknn.load_tensorflow(tf_pb='digital_gesture.pb',
  32.                          inputs=['input_x'],
  33.                          outputs=['probability'],
  34.                          input_size_list=[[INPUT_SIZE, INPUT_SIZE, 3]])
  35.     print('done')
  37.     '''
  38.     Create a parsing pb model
  39.     do_quantization=False do not to be quantified
  40.     Quantization will reduce the size of the model and increase the speed of the operation,
  41.     but there will be loss of precision.
  42.     '''
  44.     print('--> Building model')
  46.     print('done')
  47.     rknn.export_rknn('./digital_gesture.rknn')  # Export and save rknn model file
  48.     rknn.release()  # Release RKNN Context

Model Inference

API call flow



  1. import numpy as np
  2. from PIL import Image
  3. from rknn.api import RKNN
  6. # Analyze the output of the model to get the most probable gesture and corresponding probability
  7. def get_predict(probability):
  8.     data = probability[0][0]
  9.     data = data.tolist()
  10.     max_prob = max(data)
  11.     return data.index(max_prob), max_prob
  14. def load_model():
  15.     rknn = RKNN()  # Create an RKNN execution object
  16.     print('-->loading model')
  17.     rknn.load_rknn('./digital_gesture.rknn')  # Load RKNN model
  18.     print('loading model done')
  19.     print('--> Init runtime environment')
  20.     ret = rknn.init_runtime(host='rk3399pro')  # Initialize the RKNN runtime environment
  21.     if ret != 0:
  22.         print('Init runtime environment failed')
  23.         exit(ret)
  24.     print('done')
  25.     return rknn
  28. def predict(rknn):
  29.     im ="../picture/6_7.jpg")   # load image
  30.     im = im.resize((64, 64), Image.ANTIALIAS)  # Image resize to 64x64
  31.     mat = np.asarray(im.convert('RGB'))    # Convert to RGB format
  32.     outputs = rknn.inference(inputs=[mat])   # Run forward inference and get the inference result
  33.     pred, prob = get_predict(outputs)     # Transform the inference results into visual information
  34.     print(prob)
  35.     print(pred)
  38. if __name__=="__main__":
  39.     rknn = load_model()
  40.     predict(rknn) 
  41.     rknn.release()