根据下面的内容写一篇技术博客,要求增加更多的解释,让普通读者也能了解为什么这样做,具体怎么做

一、背景

• driver_monitoring_system 是一个旨在监控驾驶员状态和行为的项目，例如打哈欠、打电话
• MobileNet用来预测驾驶员的行为(电话、短信) 该模型基于tensorflow
• 本文介绍如果将该模型移植到RK3588
• 手机检测模型参考:在RK3588上实现YOLOv8n高效推理

二、操作步骤

2.1 下载源码

git clone https://github.com/jhan15/driver_monitoring.git
cd driver_monitoring

2.2 Tensorflow转成ONNX

2.2.1 在x86上创建容器,安装依赖

docker run -it --privileged --net=host \-v $PWD:/home -w /home --rm  nvcr.io/nvidia/pytorch:22.02-py3 /bin/bashpip install tf-estimator-nightly==2.8.0.dev2021122109
pip install tensorflow==2.8.0 -i https://pypi.tuna.tsinghua.edu.cn/simple
pip install tf2onnx onnx -i https://pypi.tuna.tsinghua.edu.cn/simple
pip install onnxruntime -i https://pypi.tuna.tsinghua.edu.cn/simple

2.2.2 保存为saved-model

cat > cvt.py <<-'EOF'
import tensorflow as tf
from tensorflow.keras import Sequential
from tensorflow.keras.layers.experimental.preprocessing import Rescaling
from tensorflow.keras.layers import RandomRotation, RandomZoom, Dense, Dropout,\BatchNormalization, GlobalAveragePooling2D
from tensorflow.keras.optimizers import Adam
from tf2onnx import convert
from net import MobileNet
from PIL import Image
import tensorflow as tf
import numpy as npclass MobileNet(Sequential):   def __init__(self, input_shape=(224,224,3), num_classes=2, dropout=0.25, lr=1e-3,augmentation=False, train_base=False, add_layer=False):super().__init__()self.base_model = tf.keras.applications.MobileNetV2(weights='imagenet',input_shape=input_shape,include_top=False)self.base_model.trainable = train_base        self.add(self.base_model)self.add(GlobalAveragePooling2D())self.add(Dropout(dropout))        if add_layer:self.add(Dense(256, activation='relu'))self.add(Dropout(dropout))        self.add(Dense(num_classes, activation='softmax'))        self.compile(optimizer=Adam(learning_rate=lr),loss='sparse_categorical_crossentropy',metrics=["accuracy"])model = MobileNet()
model.load_weights('models/model_split.h5')rgb_image = Image.open("0.jpg")
rgb_image = np.array(rgb_image.resize((224,224))).astype(np.float32)
rgb_image = (tf.expand_dims(rgb_image, 0)-127.5)/127.5
print(rgb_image.shape)
y = model.predict(rgb_image)
print(model.input)
print(model.output)
print(y.shape,y.reshape(-1)[:8])
result = np.argmax(y, axis=1)
print(result.shape)
model.save("keras_model")
EOF
rm -rf keras_model
python3 cvt.py

2.2.3 saved-model转ONNX

python -m tf2onnx.convert --inputs-as-nchw mobilenetv2_1_00_224_input:0 \--inputs mobilenetv2_1_00_224_input:0[1,224,224,3] \--saved-model keras_model --output model.onnx
rm keras_model -rf

2.2.4 ONNX推理

cat > onnx_forward.py <<-'EOF'
import onnxruntime as ort
import numpy as np
import sys
from PIL import Imagemodel_path = "model.onnx"
session = ort.InferenceSession(model_path)
inputs_info = session.get_inputs()
outputs_info = session.get_outputs()rgb_image = Image.open("0.jpg")
rgb_image = np.array(rgb_image.resize((224,224)))
rgb_image = rgb_image[np.newaxis, :].transpose(0, 3, 1, 2)
rgb_image = (rgb_image.astype(np.float32)-127.5)/127.5input_data = {}
input_data['mobilenetv2_1_00_224_input:0']=rgb_image
outputs = session.run(None, input_data)for i, output_info in enumerate(outputs_info):output_name = output_info.nameprint(outputs[i])
EOF
python3 onnx_forward.py

2.3 ONNX转RKNN

cat > onnx2rknn.py <<-'EOF'
import os
import urllib
import traceback
import time
import sys
import numpy as np
import cv2
from rknn.api import RKNN
from math import exp
import cv2
import numpy as npONNX_MODEL = 'model.onnx'
RKNN_MODEL = 'model.rknn'
is_quant=1rknn = RKNN(verbose=True)
rknn.config(mean_values=[[127.5, 127.5, 127.5]], std_values=[[127.5, 127.5, 127.5]], target_platform='rk3588')
ret = rknn.load_onnx(model=ONNX_MODEL)
if ret != 0:print('Load model failed!')exit(ret)
ret = rknn.build(do_quantization=is_quant, dataset='./dataset.txt',auto_hybrid=True)
if ret != 0:print('Build model failed!')exit(ret)
ret = rknn.export_rknn(RKNN_MODEL)
if ret != 0:print('Export rknn model failed!')exit(ret)
rknn.release()
EOF
echo "0.jpg" > ./dataset.txt
python3 onnx2rknn.py

2.4 RKNN推理

cat > rknn_forward.py <<-'EOF'
import time
import numpy as np
from rknnlite.api import RKNNLite
from PIL import Image
import numpy as nprgb_image = Image.open("0.jpg")
rgb_image = np.array(rgb_image.resize((224,224)))
rgb_image = rgb_image[np.newaxis, :]rknn_lite = RKNNLite()
ret = rknn_lite.load_rknn('model.rknn')
if ret != 0:print('Load RKNN model failed')exit(ret)
ret = rknn_lite.init_runtime(core_mask=RKNNLite.NPU_CORE_AUTO)
if ret != 0:print('Init runtime environment failed')exit(ret)
outputs = rknn_lite.inference(inputs=[rgb_image],data_format=['nhwc'])
print(outputs)
EOF
python3 rknn_forward.py