部署参考：https://github.com/PaddlePaddle/FastDeploy/blob/develop/tutorials/multi_thread/python/pipeline/README_CN.md

安装
cpu： pip install fastdeploy-python

gpu ：pip install fastdeploy-gpu-python

#下载部署示例代码
git clone https://github.com/PaddlePaddle/FastDeploy.git
cd  FastDeploy/tutorials/multi_thread/python/pipeline# 下载模型,图片和字典文件
wget https://paddleocr.bj.bcebos.com/PP-OCRv3/chinese/ch_PP-OCRv3_det_infer.tar
tar xvf ch_PP-OCRv3_det_infer.tarwget https://paddleocr.bj.bcebos.com/dygraph_v2.0/ch/ch_ppocr_mobile_v2.0_cls_infer.tar
tar -xvf ch_ppocr_mobile_v2.0_cls_infer.tarwget https://paddleocr.bj.bcebos.com/PP-OCRv3/chinese/ch_PP-OCRv3_rec_infer.tar
tar xvf ch_PP-OCRv3_rec_infer.tarwget https://gitee.com/paddlepaddle/PaddleOCR/raw/release/2.6/doc/imgs/12.jpgwget https://gitee.com/paddlepaddle/PaddleOCR/raw/release/2.6/ppocr/utils/ppocr_keys_v1.txt

命令：
多线程

python multi_thread_process_ocr.py --det_model ch_PP-OCRv3_det_infer --cls_model ch_ppocr_mobile_v2.0_cls_infer --rec_model ch_PP-OCRv3_rec_infer --rec_label_file ppocr_keys_v1.txt --image_path xxx/xxx --device gpu --thread_num 3

多进程

python multi_thread_process_ocr.py --det_model ch_PP-OCRv3_det_infer --cls_model ch_ppocr_mobile_v2.0_cls_infer --rec_model ch_PP-OCRv3_rec_infer --rec_label_file ppocr_keys_v1.txt --image_path xxx/xxx --device gpu --use_multi_process True --process_num 3

问题

多进程图片分配有bug

文件：multi_thread_process_ocr.py
原始代码：270行

修改为如下，去掉1

ModuleNotFoundError: No module named ‘example’

因为安装包不对，fastdeploy与fastdeploy-python不是同一个包

CUDA error(3), initialization error.

  ----------------------Error Message Summary:----------------------ExternalError: CUDA error(3), initialization error. [Hint: Please search for the error code(3) on website (https://docs.nvidia.com/cuda/cuda-runtime-api/group__CUDART__TYPES.html#group__CUDART__TYPES_1g3f51e3575c2178246db0a94a430e0038) to get Nvidia's official solution and advice about CUDA Error.] (at /home/fastdeploy/develop/paddle_build/v0.0.0/Paddle/paddle/phi/backends/gpu/cuda/cuda_info.cc:251)

参考：
PaddlePaddle——问题解决：使用Python multiprocessing时报错：CUDA error(3), initialization error.
https://github.com/PaddlePaddle/PaddleDetection/issues/2241
paddle 相关模块只在方法里面引用，要在多进程外有 import 这些模块

flask部署

发送列表类型的图片base64编码，返回列表类型的字符串

注意server端文件放在FastDeploy/tutorials/multi_thread/python/pipeline目录下
创建server端

from threading import Threadimport cv2
import os
from multiprocessing import Pool
import sysimport fastdeploy as fd
import numpy as np
import base64
from PIL import Image
from io import BytesIO
from sqlalchemy import create_engine, textfrom flask import Flask, request, jsonify
import argparse
import ast# watch -n 0.1 nvidia-smidef parse_arguments():parser = argparse.ArgumentParser()parser.add_argument("--det_model",# required=True,type=str,default='ch_PP-OCRv3_det_infer',help="Path of Detection model of PPOCR.")parser.add_argument("--cls_model",# required=True,type=str,default='ch_ppocr_mobile_v2.0_cls_infer',help="Path of Classification model of PPOCR.")parser.add_argument("--rec_model",# required=True,type=str,default='ch_PP-OCRv3_rec_infer',help="Path of Recognization model of PPOCR.")parser.add_argument("--rec_label_file",# required=True,type=str,default='ppocr_keys_v1.txt',help="Path of Recognization model of PPOCR.")# parser.add_argument(#     "--image_path",#     type=str,#     required=True,#     help="The directory or path or file list of the images to be predicted."# )parser.add_argument("--device",type=str,default='gpu', # cpuhelp="Type of inference device, support 'cpu', 'kunlunxin' or 'gpu'.")parser.add_argument("--backend",type=str,default="default",help="Type of inference backend, support ort/trt/paddle/openvino, default 'openvino' for cpu, 'tensorrt' for gpu")parser.add_argument("--device_id",type=int,default=0,help="Define which GPU card used to run model.")parser.add_argument("--cpu_thread_num",type=int,default=9,help="Number of threads while inference on CPU.")parser.add_argument("--cls_bs",type=int,default=1,help="Classification model inference batch size.")parser.add_argument("--rec_bs",type=int,default=6,help="Recognition model inference batch size")parser.add_argument("--thread_num", type=int, default=1, help="thread num")parser.add_argument("--use_multi_process",type=ast.literal_eval,default=True,help="Wether to use multi process.")parser.add_argument("--process_num", type=int, default=5, help="process num")return parser.parse_args()def get_image_list(image_path):image_list = []if os.path.isfile(image_path):image_list.append(image_path)# load image in a directoryelif os.path.isdir(image_path):for root, dirs, files in os.walk(image_path):for f in files:image_list.append(os.path.join(root, f))else:raise FileNotFoundError('{} is not found. it should be a path of image, or a directory including images.'.format(image_path))if len(image_list) == 0:raise RuntimeError('There are not image file in `--image_path`={}'.format(image_path))return image_listdef build_option(args):option = fd.RuntimeOption()if args.device.lower() == "gpu":option.use_gpu(args.device_id)option.set_cpu_thread_num(args.cpu_thread_num)if args.device.lower() == "kunlunxin":option.use_kunlunxin()return optionif args.backend.lower() == "trt":assert args.device.lower() == "gpu", "TensorRT backend require inference on device GPU."option.use_trt_backend()elif args.backend.lower() == "pptrt":assert args.device.lower() == "gpu", "Paddle-TensorRT backend require inference on device GPU."option.use_trt_backend()option.enable_paddle_trt_collect_shape()option.enable_paddle_to_trt()elif args.backend.lower() == "ort":option.use_ort_backend()elif args.backend.lower() == "paddle":option.use_paddle_infer_backend()elif args.backend.lower() == "openvino":assert args.device.lower() == "cpu", "OpenVINO backend require inference on device CPU."option.use_openvino_backend()return optiondef load_model(args, runtime_option):# Detection模型, 检测文字框det_model_file = os.path.join(args.det_model, "inference.pdmodel")det_params_file = os.path.join(args.det_model, "inference.pdiparams")# Classification模型，方向分类，可选cls_model_file = os.path.join(args.cls_model, "inference.pdmodel")cls_params_file = os.path.join(args.cls_model, "inference.pdiparams")# Recognition模型，文字识别模型rec_model_file = os.path.join(args.rec_model, "inference.pdmodel")rec_params_file = os.path.join(args.rec_model, "inference.pdiparams")rec_label_file = args.rec_label_file# PPOCR的cls和rec模型现在已经支持推理一个Batch的数据# 定义下面两个变量后, 可用于设置trt输入shape, 并在PPOCR模型初始化后, 完成Batch推理设置cls_batch_size = 1rec_batch_size = 6# 当使用TRT时，分别给三个模型的runtime设置动态shape,并完成模型的创建.# 注意: 需要在检测模型创建完成后，再设置分类模型的动态输入并创建分类模型, 识别模型同理.# 如果用户想要自己改动检测模型的输入shape, 我们建议用户把检测模型的长和高设置为32的倍数.det_option = runtime_optiondet_option.set_trt_input_shape("x", [1, 3, 64, 64], [1, 3, 640, 640],[1, 3, 960, 960])# 用户可以把TRT引擎文件保存至本地#det_option.set_trt_cache_file(args.det_model  + "/det_trt_cache.trt")global det_modeldet_model = fd.vision.ocr.DBDetector(det_model_file, det_params_file, runtime_option=det_option)cls_option = runtime_optioncls_option.set_trt_input_shape("x", [1, 3, 48, 10],[cls_batch_size, 3, 48, 320],[cls_batch_size, 3, 48, 1024])# 用户可以把TRT引擎文件保存至本地# cls_option.set_trt_cache_file(args.cls_model  + "/cls_trt_cache.trt")global cls_modelcls_model = fd.vision.ocr.Classifier(cls_model_file, cls_params_file, runtime_option=cls_option)rec_option = runtime_optionrec_option.set_trt_input_shape("x", [1, 3, 48, 10],[rec_batch_size, 3, 48, 320],[rec_batch_size, 3, 48, 2304])# 用户可以把TRT引擎文件保存至本地#rec_option.set_trt_cache_file(args.rec_model  + "/rec_trt_cache.trt")global rec_modelrec_model = fd.vision.ocr.Recognizer(rec_model_file,rec_params_file,rec_label_file,runtime_option=rec_option)# 创建PP-OCR，串联3个模型，其中cls_model可选，如无需求，可设置为Noneglobal ppocr_v3ppocr_v3 = fd.vision.ocr.PPOCRv3(det_model=det_model, cls_model=cls_model, rec_model=rec_model)# 给cls和rec模型设置推理时的batch size# 此值能为-1, 和1到正无穷# 当此值为-1时, cls和rec模型的batch size将默认和det模型检测出的框的数量相同ppocr_v3.cls_batch_size = cls_batch_sizeppocr_v3.rec_batch_size = rec_batch_sizedef predict(model, img_list):result_list = []# predict ppocr resultfor image in img_list:im = cv2.imread(image)result = model.predict(im)result_list.append(result)return result_listdef process_predict(image):# predict ppocr resultim = cv2.imread(image)result = ppocr_v3.predict(im)print(result)def process_predict_text(base64_str):image = base64_to_bgr(base64_str)result = ppocr_v3.predict(image)# print(result)return ''.join(result.text) #不能直接返回OCR对象序列化会失败def cv_show(img):'''展示图片@param img:@param name:@return:'''cv2.namedWindow('name', cv2.WINDOW_KEEPRATIO)  # cv2.WINDOW_NORMAL | cv2.WINDOW_KEEPRATIOcv2.imshow('name', img)cv2.waitKey(0)cv2.destroyAllWindows()def base64_to_bgr(base64_str):base64_hex = base64.b64decode(base64_str)image = BytesIO(base64_hex)img = Image.open(image)if img.mode=='RGBA':width = img.widthheight = img.heightimg2 = Image.new('RGB', size=(width, height), color=(255, 255, 255))img2.paste(img, (0, 0), mask=img)image_array = np.array(img2)else:image_array = np.array(img)image = cv2.cvtColor(image_array, cv2.COLOR_RGB2BGR)return imageclass WrapperThread(Thread):def __init__(self, func, args):super(WrapperThread, self).__init__()self.func = funcself.args = args# self.result = self.func(*self.args)def run(self):self.result = self.func(*self.args)def get_result(self):return self.resultdef ocr_image_list(imgs_list):args = parse_arguments()# 对于三个模型，均采用同样的部署配置# 用户也可根据自行需求分别配置runtime_option = build_option(args)if args.use_multi_process:process_num = args.process_numwith Pool(process_num,initializer=load_model,initargs=(args, runtime_option)) as pool:#results = pool.map(process_predict_text, imgs_list)# pool.map(process_predict, imgs_list)# 进一步处理结果for i, result in enumerate(results):print(i, result)else:load_model(args, runtime_option)threads = []thread_num = args.thread_numimage_num_each_thread = int(len(imgs_list) / thread_num)# unless you want independent model in each thread, actually model.clone()# is the same as model when creating thead because of the existence of# GIL(Global Interpreter Lock) in python. In addition, model.clone() will consume# additional memory to store independent member variablesfor i in range(thread_num):if i == thread_num - 1:t = WrapperThread(predict,args=(ppocr_v3.clone(),imgs_list[i * image_num_each_thread:]))else:t = WrapperThread(predict,args=(ppocr_v3.clone(),imgs_list[i * image_num_each_thread:(i + 1) *image_num_each_thread]))  # - 1threads.append(t)t.start()for i in range(thread_num):threads[i].join()for i in range(thread_num):for result in threads[i].get_result():print('thread:', i, ', result: ', result)@app.route('/ocr/submit', methods=['POST'])
def ocr():args = parse_arguments()process_num = 1#args.process_numruntime_option = build_option(args)data = request.get_json()# 获取 Base64 数据base64_str = data['img_base64']with Pool(process_num, initializer=load_model, initargs=(args, runtime_option)) as pool:results = pool.map(process_predict_text, base64_str)# 返回响应response = {'message': 'Data received', 'result': results}return jsonify(response)import json
import pandas as pd
import timeif __name__ == '__main__':app.run(host='192.168.xxx.xxx', port=5000)

client 端

import base64
import sysimport requests
import json
# 读取图像文件
with open('./pic/img.png', 'rb') as image_file:# 将图像文件内容读取为字节流image_data = image_file.read()# 将图像字节流进行 Base64 编码
img_base64 = base64.b64encode(image_data)data = {'img_base64': [img_base64.decode('utf-8')] }headers = {'Content-Type': 'application/json'
}response = requests.post("http://192.168.xxx.xxx:5000/ocr/submit",  data=json.dumps(data),headers = headers)if response.status_code == 200:result = response.json()print(result['result'])
else:print('Error:', response.status_code)