NPU

RK3588 has a NPU(

Neural Process Unit

) that Neural network acceleration engine with processing performance
up to 6 TOPS. Using this NPU module needs to download

RKNN SDK

 which provides programming interfaces for RK3588S/RK3588 chip
platforms with NPU. This SDK can help users deploy RKNN models
exported by RKNN-Toolkit2 and accelerate the implementation of AI
applications

RKNN Model

RKNN is the model type used by the Rockchip NPU platform. It is a
model file ending with the suffix ".rknn ". RKNN SDK provides a
complete model transformation Python tool for users to convert their
self-developed algorithm model into RKNN model

The RKNN model can run directly on the RK3588 platform. There are
demos under "rknpu2/examples". Refer to the "README.md" to compile
Android or Linux Demo (Need cross-compile environment). You can also
just download compiled

demo

.

Run demo on the AIO-3588Q  as follows:

   :/ # cd /data/rknn_ssd_demo_Android/    (use rknn_ssd_demo_Linux in Linux System)
   :/data/rknn_ssd_demo_Android # chmod 777 rknn_ssd_demo
   :/data/rknn_ssd_demo_Android # export LD_LIBRARY_PATH=./lib
   :/data/rknn_ssd_demo_Android # ./rknn_ssd_demo model/RK3588/ssd_inception_v2.rknn model/road.bmp 
   Loading model ...
   rknn_init ...
   model input num: 1, output num: 2
   input tensors:
     index=0, name=Preprocessor/sub:0, n_dims=4, dims=[1, 300, 300, 3], n_elems=270000, size=270000, fmt=NHWC, type=INT8, qnt_type=AFFINE, zp=0, scale=0.007812
   output tensors:
     index=0, name=concat:0, n_dims=4, dims=[1, 1917, 1, 4], n_elems=7668, size=7668, fmt=NCHW, type=INT8, qnt_type=AFFINE, zp=53, scale=0.089455
     index=1, name=concat_1:0, n_dims=4, dims=[1, 1917, 91, 1], n_elems=174447, size=174447, fmt=NCHW, type=INT8, qnt_type=AFFINE, zp=53, scale=0.143593
   rknn_run
   loadLabelName
   ssd - loadLabelName ./model/coco_labels_list.txt
   loadBoxPriors
   person @ (12 124 60 209) 0.982374
   person @ (110 119 153 195) 0.973138
   bicycle @ (172 163 277 233) 0.973138
   person @ (207 113 258 218) 0.969119
   car @ (148 133 215 170) 0.953267
   person @ (83 134 92 158) 0.639771
   person @ (49 133 58 156) 0.606060
   person @ (96 134 105 162) 0.428693

Non-RKNN Model

For other models like Caffe, TensorFlow, etc, to run on RK3588
platform, conversions are needed. Use RKNN-Toolkit2 to convert other
model into RKNN model.

RKNN-Toolkit2

Introduction of Tool

RKNN-Toolkit2 is a development kit that provides users with model
conversion, inference and performance evaluation on PC and Rockchip
NPU platforms. Users can easily complete the following functions
through the Python interface provided by the tool:

<font color=blue>Model conversion</font>: support to convert Caffe /
TensorFlow / TensorFlow Lite / ONNX / Darknet / PyTorch model to RKNN
model, support RKNN model import/export, which can be used on Rockchip
NPU platform later <br></br>

<font color=blue>Quantization</font>: support to convert float model
to quantization model, currently support quantized methods including
asymmetric quantization(asymmetric_quantized-8,
asymmetric_quantized-16). and support hybrid quantization. <font
color=red>Asymmetric_quantized-16 not supported yet</font> <br></br>

<font color=blue>Model inference</font>: Able to simulate Rockchip NPU
to run RKNN model on PC and get the inference result. This tool can
also distribute the RKNN model to the specified NPU device to run, and
get the inference results <br></br>

<font color=blue>Performance evaluation</font>: distribute the RKNN
model to the specified NPU device to run, and evaluate the model
performance in the actual device <br></br>

<font color=blue>Memory evaluation</font>: Evaluate memory consumption
at runtime of the model. When using this function, the RKNN model must
be distributed to the NPU device to run, and then call the relevant
interface to obtain memory information <br></br>

<font color=blue>Quantitative error analysis</font>: This function
will give the Euclidean or cosine distance of each layer of inference
results before and after the model is quantized. This can be used to
analyze how quantitative error occurs, and provide ideas for improving
the accuracy of quantitative models

Environment Dependence

The system needs: Ubuntu 18.04 (x64) or later. <font color=red> The
Toolkit can only be installed on PC, and Windows, MacOS or Debian not
supported yet</font>

Python version: 3.6/3.8

Python rely on：

   #Python3.6
   cat doc/requirements_cp36-1.3.0.txt
   numpy==1.16.6
   onnx==1.7.0
   onnxoptimizer==0.1.0
   onnxruntime==1.6.0
   tensorflow==1.14.0
   tensorboard==1.14.0
   protobuf==3.12.0
   torch==1.6.0
   torchvision==0.7.0
   psutil==5.6.2
   ruamel.yaml==0.15.81
   scipy==1.2.1
   tqdm==4.27.0
   requests==2.21.0
   opencv-python==4.4.0.46
   PuLP==2.4
   scikit_image==0.17.2
   # if install bfloat16 failed, please install numpy manually first. "pip install numpy==1.16.6"
   bfloat16==1.1
   flatbuffers==1.12

   #Python3.8
   cat doc/requirements_cp38-1.3.0.txt
   numpy==1.17.3
   onnx==1.7.0
   onnxoptimizer==0.1.0
   onnxruntime==1.6.0
   tensorflow==2.2.0
   tensorboard==2.2.2
   protobuf==3.12.0
   torch==1.6.0
   torchvision==0.7.0
   psutil==5.6.2
   ruamel.yaml==0.15.81
   scipy==1.4.1
   tqdm==4.27.0
   requests==2.21.0
   opencv-python==4.4.0.46
   PuLP==2.4
   scikit_image==0.17.2
   # if install bfloat16 failed, please install numpy manually first. "pip install numpy==1.17.3"
   bfloat16==1.1

RKNN-Toolkit2 installation

It is recommended to use virtualenv to manage the python environment
because there may be multiple versions of the python environment in
the system at the same time. Let's start with Python 3.6 as an
example:

   # 1）Install virtualenv、Python3.6 and pip3
   sudo apt install virtualenv \
   sudo apt-get install python3 python3-dev python3-pip
   # 2）Install dependent libraries
   sudo apt-get install libxslt1-dev zlib1g zlib1g-dev libglib2.0-0 libsm6 \
   libgl1-mesa-glx libprotobuf-dev gcc
   # 3）Use virtualenv and install Python dependency, such as requirements_cp36-1.3.0.txt 
   virtualenv -p /usr/bin/python3 venv
   source venv/bin/activate
   pip3 install -r doc/requirements_cp36-*.txt
   # 4）Install RKNN-Toolkit2，such as rknn_toolkit2-1.3.0_11912b58-cp36-cp36m-linux_x86_64.whl
   sudo pip3 install packages/rknn_toolkit2*cp36*.whl
   # 5）Check if RKNN-Toolkit2 is installed successfully or not，press key ctrl+d to exit
   (venv) firefly@T-chip:~/rknn-toolkit2$ python3
   >>> from rknn.api import RKNN
   >>>

The installation is successful if the import of RKNN module doesn't
fail. One of the failures is as follows:

   >>> from rknn.api import RKNN
   Traceback (most recent call last):
     File "<stdin>", line 1, in <module>
   ImportError: No module named 'rknn'

Model Conversion Demo

Toolkit Demos are under "rknn-toolkit2/examples". Here we run a model
conversion demo for example, this demo shows the process of converting
tflite to RKNN, exporting model, inferencing, deploying on NPU and
fetching results. For detailed implementation of the model conversion,
please refer to the source code in Demo and the documents at the end
of this page.

Simulate the running example on PC

RKNN-Toolkit2 has a built-in simulator, simply run a demo to deploy on
NPU simulator.

   (venv) firefly@T-chip:~/rknn-toolkit2$ cd examples/tflite/mobilenet_v1
   (venv) firefly@T-chip:~/rknn-toolkit2/examples/tflite/mobilenet_v1$ ls
   dataset.txt  dog_224x224.jpg  mobilenet_v1_1.0_224.tflite  test.py
   (venv) firefly@T-chip:~/rknn-toolkit2/examples/tflite/mobilenet_v1$ python3 test.py
   W __init__: rknn-toolkit2 version: 1.3.0-11912b58
   --> Config model
   W config: 'target_platform' is None, use rk3566 as default, Please set according to the actual platform!
   done
   --> Loading model
   INFO: Initialized TensorFlow Lite runtime.
   done
   --> Building model
   Analysing : 100%|█████████████████████████████████████████████████| 58/58 [00:00<00:00, 1869.33it/s]
   Quantizating : 100%|████████████████████████████████████████████████| 58/58 [00:00<00:00, 68.07it/s]
   W build: The default input dtype of 'input' is changed from 'float32' to 'int8' in rknn model for performance!
                         Please take care of this change when deploy rknn model with Runtime API!
   done
   --> Export rknn model
   done
   --> Init runtime environment
   Analysing : 100%|█████████████████████████████████████████████████| 60/60 [00:00<00:00, 1434.93it/s]
   Preparing : 100%|██████████████████████████████████████████████████| 60/60 [00:00<00:00, 373.17it/s]
   W init_runtime: target is None, use simulator!
   done
   --> Running model
   mobilenet_v1
   -----TOP 5-----
   [156]: 0.9345703125
   [155]: 0.0570068359375
   [205]: 0.00429534912109375
   [284]: 0.003116607666015625
   [285]: 0.00017178058624267578

   done

Run on AIO-3588Q  NPU connected to the PC

RKNN Toolkit2 runs on the PC and connects to the AIO-3588Q  through
the PC's USB. RKNN Toolkit2 transfers the RKNN model to the NPU device
of AIO-3588Q  to run, and then obtains the inference results,
performance information, etc. from the AIO-3588Q

First prepare AIO-3588Q  environment: update librknnrt.so and run
rknn_server

Android

   adb root && adb remount
   adb push rknpu2/runtime/RK3588/Android/rknn_server/arm64-v8a/vendor/bin/rknn_server /vendor/bin
   adb push rknpu2/runtime/RK3588/Android/librknn_api/arm64-v8a/librknnrt.so /vendor/lib64
   adb push rknpu2/runtime/RK3588/Android/librknn_api/arm64-v8a/librknnrt.so /vendor/lib
   adb shell reboot

   # Android System will automatically run rknn_server, chekc it by using command "ps -ef | grep rknn_server"

Linux

   adb push rknpu2/runtime/RK3588/Linux/rknn_server/aarch64/usr/bin/rknn_server /usr/bin/
   adb push rknpu2/runtime/RK3588/Linux/librknn_api/aarch64/librknnrt.so /usr/lib/
   adb push rknpu2/runtime/RK3588/Linux/librknn_api/aarch64/librknn_api.so /usr/lib/

   # We can use "systemctl status rknn_server" to check whether the rknn_server is running.
   # Without running rknn_server, run it on the serial terminal
   chmod +x /usr/bin/rknn_server
   /usr/bin/rknn_server

Then modify the demo file examples/tflite/mobilenet_v1/test.py on PC,
add the target platform in it.

   diff --git a/examples/tflite/mobilenet_v1/test.py b/examples/tflite/mobilenet_v1/test.py
   index 0507edb..fd2e070 100755
   --- a/examples/tflite/mobilenet_v1/test.py
   +++ b/examples/tflite/mobilenet_v1/test.py
   @@ -24,11 +24,11 @@ def show_outputs(outputs):
    if __name__ == '__main__':
    
        # Create RKNN object
   -    rknn = RKNN(verbose=True)
   +    rknn = RKNN()
    
        # Pre-process config
        print('--> Config model')
   -    rknn.config(mean_values=[128, 128, 128], std_values=[128, 128, 128])
   +    rknn.config(mean_values=[128, 128, 128], std_values=[128, 128, 128], target_platform='rk3588')
        print('done')
    
        # Load model
   @@ -62,7 +62,7 @@ if __name__ == '__main__':
    
        # Init runtime environment
        print('--> Init runtime environment')
   -    ret = rknn.init_runtime()
   +    ret = rknn.init_runtime(target='rk3588')
        if ret != 0:
            print('Init runtime environment failed!')
            exit(ret)

Run test.py on host PC

   (venv) firefly@T-chip:~/rknn-toolkit2/examples/tflite/mobilenet_v1$ python3 test.py 
   W __init__: rknn-toolkit2 version: 1.3.0-11912b58
   --> Config model
   done
   --> Loading model
   INFO: Initialized TensorFlow Lite runtime.
   done
   --> Building model
   Analysing : 100%|█████████████████████████████████████████████████| 58/58 [00:00<00:00, 1903.99it/s]
   Quantizating : 100%|███████████████████████████████████████████████| 58/58 [00:00<00:00, 114.55it/s]
   W build: The default input dtype of 'input' is changed from 'float32' to 'int8' in rknn model for performance!
                         Please take care of this change when deploy rknn model with Runtime API!
   done
   --> Export rknn model
   done
   --> Init runtime environment
   I NPUTransfer: Starting NPU Transfer Client, Transfer version 2.1.0 (b5861e7@2020-11-23T11:50:36)
   D RKNNAPI: ==============================================
   D RKNNAPI: RKNN VERSION:
   D RKNNAPI:   API: 1.3.0 (121b661 build: 2022-04-29 11:07:20)
   D RKNNAPI:   DRV: rknn_server: 1.3.0 (121b661 build: 2022-04-29 11:11:57)
   D RKNNAPI:   DRV: rknnrt: 1.3.0 (c193be371@2022-05-04T20:16:22)
   D RKNNAPI: ==============================================
   done
   --> Running model
   mobilenet_v1
   -----TOP 5-----
   [156]: 0.93505859375
   [155]: 0.057037353515625
   [205]: 0.0038814544677734375
   [284]: 0.0031185150146484375
   [285]: 0.00017189979553222656

   done

Other Toolkit Demo

Other Toolkit demos can be found under "rknn-toolkit2/examples/", such
as quantization, accuracy analysis demos. For detailed implementation,
please refer to the source code in Demo and the detailed development
documents.

Detailed Development Documents

Please refer to <<Rockchip_RKNPU_User_Guide_RKNN_API_*.pdf>> and
<<Rockchip_User_Guide_RKNN_Toolkit2_*.pdf>> in RKNN SDK for
development.