参考：
https://developers.google.com/mediapipe/solutions/customization/image_classifier
https://colab.research.google.com/github/googlesamples/mediapipe/blob/main/examples/customization/image_classifier.ipynb#scrollTo=plvO-YmcQn5g

安装：

pip install mediapipe-model-maker  -i http://mirrors.aliyun.com/pypi/simple --trusted-host mirrors.aliyun.com --use-pep517

版本错误情况

1）RuntimeError: File loading is not yet supported on Windows

其中mediapipe版本要大于等于0.10.0；下图中的要升级；不然后续用python 加载文件会报：

2）ImportError: cannot import name ‘array_record_module’ from ‘array_record.python’ ；参考：https://blog.csdn.net/LQ_001/article/details/130991571；原因：包依赖关系出现问题，原来版本 tensorflow-datasets==4.9.0

pip install tensorflow-datasets==4.8.3

1、训练代码

import os
import tensorflow as tf
assert tf.__version__.startswith('2')

from mediapipe_model_maker import image_classifier

import matplotlib.pyplot as plt




image_path = os.path.join(os.path.dirname(r"C:\Users\loong\Downloads\mediapipe\flower_photos\flower_photos"), 'flower_photos')   ## down data  ：https://storage.googleapis.com/download.tensorflow.org/example_images/flower_photos.tgz


#Review data

labels = []
for i in os.listdir(image_path):
  if os.path.isdir(os.path.join(image_path, i)):
    labels.append(i)
print(labels)

##plt 
NUM_EXAMPLES = 5

for label in labels:
  label_dir = os.path.join(image_path, label)
  example_filenames = os.listdir(label_dir)[:NUM_EXAMPLES]
  fig, axs = plt.subplots(1, NUM_EXAMPLES, figsize=(10,2))
  for i in range(NUM_EXAMPLES):
    axs[i].imshow(plt.imread(os.path.join(label_dir, example_filenames[i])))
    axs[i].get_xaxis().set_visible(False)
    axs[i].get_yaxis().set_visible(False)
  fig.suptitle(f'Showing {NUM_EXAMPLES} examples for {label}')

plt.show()

#Create dataset；训练集、测试集

data = image_classifier.Dataset.from_folder(image_path)
train_data, remaining_data = data.split(0.8)
test_data, validation_data = remaining_data.split(0.5)


## retrain model 训练模型

spec = image_classifier.SupportedModels.MOBILENET_V2    ##有几个预训练模型，需要联网下载
hparams = image_classifier.HParams(export_dir="exported_model")  ##指定模型保存位置
options = image_classifier.ImageClassifierOptions(supported_model=spec, hparams=hparams)
model = image_classifier.ImageClassifier.create(
    train_data = train_data,
    validation_data = validation_data,
    options=options,
)

## 验证模型
loss, acc = model.evaluate(test_data)
print(f'Test loss:{loss}, Test accuracy:{acc}')

##保存模型
model.export_model()

默认训练是10epcos

##模型压缩
from mediapipe_model_maker import quantization

quantization_config = quantization.QuantizationConfig.for_int8(train_data)
model.export_model(model_name="model_int8.tflite", quantization_config=quantization_config)

从8M缩小到3M左右

2、加载推理

参考：https://blog.csdn.net/weixin_42357472/article/details/131322076

import mediapipe as mp

BaseOptions = mp.tasks.BaseOptions
ImageClassifier = mp.tasks.vision.ImageClassifier
ImageClassifierOptions = mp.tasks.vision.ImageClassifierOptions
VisionRunningMode = mp.tasks.vision.RunningMode

options = ImageClassifierOptions(
    base_options=BaseOptions(model_asset_path=r"C:\User**ediapipe\model.tflite"),
    max_results=5,
    running_mode=VisionRunningMode.IMAGE)   ##加载模型

classifier = ImageClassifier.create_from_options(options)


# Load the input image from an image file.
mp_image = mp.Image.create_from_file(r"C:\Users\loong\Downloads\sun2.jpg")

# Perform image classification on the provided single image.
classification_result = classifier.classify(mp_image)
classification_result