多线程执行文字识别，报Unknown exception

[mysc6699]

python3,9.7 和3.12都测试过,paddlex 3.1.3，paddleocr 3.1.0
报错如下:

python3,9.7 和3.12都测试过,paddlex 3.1.3，paddleocr 3.1.0
报错如下:
`     ocr_results = ocr.predict(image)
  File "D:\software\Python\Python39\lib\site-packages\paddleocr\_pipelines\ocr.py", line 208, in predict
    return list(
  File "D:\software\Python\Python39\lib\site-packages\paddlex\inference\pipelines\_parallel.py", line 129, in predict
    yield from self._pipeline.predict(
  File "D:\software\Python\Python39\lib\site-packages\paddlex\inference\pipelines\ocr\pipeline.py", line 350, in predict
    det_results = list(
  File "D:\software\Python\Python39\lib\site-packages\paddlex\inference\models\base\predictor\base_predictor.py", line 211, in __call__
    yield from self.apply(input, **kwargs)
  File "D:\software\Python\Python39\lib\site-packages\paddlex\inference\models\base\predictor\base_predictor.py", line 267, in apply
    prediction = self.process(batch_data, **kwargs)
  File "D:\software\Python\Python39\lib\site-packages\paddlex\inference\models\text_detection\predictor.py", line 105, in process
    batch_preds = self.infer(x=x)
  File "D:\software\Python\Python39\lib\site-packages\paddlex\inference\models\common\static_infer.py", line 287, in __call__
    pred = self.infer(x)
  File "D:\software\Python\Python39\lib\site-packages\paddlex\inference\models\common\static_infer.py", line 252, in __call__
    self.predictor.run()
RuntimeError: Unknown exception`

写了个简单的测试代码

ocrLock = threading.Lock()
mainFolder = pathlib.Path(__file__).parent
def paddle_image_to_string(image,ocr:PaddleOCR):
    ocr_results = ocr.predict(image)
    if len(ocr_results) < 1:
        return ""
    ocr_result = ocr_results[0]
    return ','.join(ocr_result.get('rec_texts', []))

def worker(ocr):
    for i in range(5):
        try:
            ocrLock.acquire()
            point = [625, 670, 1117, 1248]
            file_path = str((mainFolder / "6090/temp2.png").resolve())
            image = cv2.imread(file_path)
            imageTemp = image[point[0]:point[1], point[2]:point[3]]
            start = datetime.datetime.now()
            result = paddle_image_to_string(imageTemp, ocr)
            print(f"thread:{threading.current_thread().getName()},cost time:{datetime.datetime.now()- start},result:{result}")
        except Exception as e:
            print(f"thread:{threading.current_thread().getName()} error:{e}")
        finally:
            ocrLock.release()
        time.sleep(2)


if __name__ == "__main__":
    ocr1 = paddleocr.PaddleOCR(text_recognition_model_name="PP-OCRv4_mobile_rec", text_detection_model_name="PP-OCRv4_mobile_det",
                     use_doc_orientation_classify=False, use_doc_unwarping=False, use_textline_orientation=False)
    threads = []
    t = threading.Thread(target=worker, args=( ocr1,), daemon=True)
    threads.append(t)
    t2 = threading.Thread(target=worker, args=(ocr1,), daemon=True)
    threads.append(t2)
    t2.start()
    t.start()
    while 1:
        alive = False
        for thread in threads:
            alive = alive or thread.is_alive()
        if not alive:
            break

表现为只有首个使用了实例的线程才能执行

thread:Thread-2,cost time:0:00:00.939533,result:跳过
thread:Thread-1 error:Unknown exception
thread:Thread-2,cost time:0:00:00.717060,result:跳过
thread:Thread-1 error:Unknown exception
thread:Thread-2,cost time:0:00:00.811554,result:跳过
thread:Thread-1 error:Unknown exception
thread:Thread-2,cost time:0:00:00.716993,result:跳过
thread:Thread-1 error:Unknown exception
thread:Thread-2,cost time:0:00:00.668606,result:跳过
thread:Thread-1 error:Unknown exception

[mysc6699]

做个小改动，先执行完一个线程，再执行另外一个

mainFolder = pathlib.Path(__file__).parent
def paddle_image_to_string(image,ocr:PaddleOCR):
    ocr_results = ocr.predict(image)
    if len(ocr_results) < 1:
        return ""
    ocr_result = ocr_results[0]
    return ','.join(ocr_result.get('rec_texts', []))

def worker(ocr):
    for i in range(5):
        try:
            point = [625, 670, 1117, 1248]
            file_path = str((mainFolder / "6090/temp2.png").resolve())
            image = cv2.imread(file_path)
            imageTemp = image[point[0]:point[1], point[2]:point[3]]
            start = datetime.datetime.now()
            result = paddle_image_to_string(imageTemp, ocr)
            print(f"thread:{threading.current_thread().getName()},cost time:{datetime.datetime.now()- start},result:{result}")
        except Exception as e:
            print(f"thread:{threading.current_thread().getName()} error:{e}")
    
        time.sleep(1)

if __name__ == "__main__":
    ocr1 = paddleocr.PaddleOCR(text_recognition_model_name="PP-OCRv4_mobile_rec", text_detection_model_name="PP-OCRv4_mobile_det",
                     use_doc_orientation_classify=False, use_doc_unwarping=False, use_textline_orientation=False)
    t = threading.Thread(target=worker, args=( ocr1,), daemon=True)
    t.start()
    t.join()
    t2 = threading.Thread(target=worker, args=(ocr1,), daemon=True)
    t2.start()
    t2.join()

执行结果：

thread:Thread-1,cost time:0:00:00.290997,result:跳过
thread:Thread-1,cost time:0:00:00.039999,result:跳过
thread:Thread-1,cost time:0:00:00.039000,result:跳过
thread:Thread-1,cost time:0:00:00.038997,result:跳过
thread:Thread-1,cost time:0:00:00.039542,result:跳过
thread:Thread-2 error:Unknown exception
thread:Thread-2 error:Unknown exception
thread:Thread-2 error:Unknown exception
thread:Thread-2 error:Unknown exception
thread:Thread-2 error:Unknown exception

跟并发无关，感觉就是实例绑定了线程

[Bobholamovic]

请问这个issue对你是否有帮助：#15621