refactor(ocr): improve ONNX model initialization and resource handling

- Replace deprecated importlib.resources.path with importlib.resources.files
- Simplify code structure and improve readability
- Remove unnecessary comments and empty lines

magic_pdf/model/sub_modules/ocr/paddleocr/ocr_utils.py

@@ -7,7 +7,7 @@ import base64
 from magic_pdf.libs.boxbase import __is_overlaps_y_exceeds_threshold
 from magic_pdf.pre_proc.ocr_dict_merge import merge_spans_to_line
 
-import importlib.resources
+from importlib.resources import files
 from paddleocr import PaddleOCR
 from ppocr.utils.utility import check_and_read
 
@@ -328,35 +328,36 @@ class ONNXModelSingleton:
             self._models[key] = onnx_model_init(key)
         return self._models[key]
 
+
 def onnx_model_init(key):
     if len(key) < 4:
         logger.error('Invalid key length, expected at least 4 elements')
         exit(1)
 
     try:
-        with importlib.resources.path('rapidocr_onnxruntime.models', '') as resource_path:
-            additional_ocr_params = {
-                "use_onnx": True,
-                "det_model_dir": f'{resource_path}/ch_PP-OCRv4_det_infer.onnx',
-                "rec_model_dir": f'{resource_path}/ch_PP-OCRv4_rec_infer.onnx',
-                "cls_model_dir": f'{resource_path}/ch_ppocr_mobile_v2.0_cls_infer.onnx',
-                "det_db_box_thresh": key[1],
-                "use_dilation": key[2],
-                "det_db_unclip_ratio": key[3],
-            }
-
-            if key[0] is not None:
-                additional_ocr_params["lang"] = key[0]
-
-            # logger.info(f"additional_ocr_params: {additional_ocr_params}")
-
-            onnx_model = PaddleOCR(**additional_ocr_params)
-
-            if onnx_model is None:
-                logger.error('model init failed')
-                exit(1)
-            else:
-                return onnx_model
+        resource_path = files("rapidocr_onnxruntime") / "models"
+        additional_ocr_params = {
+            "use_onnx": True,
+            "det_model_dir": f'{resource_path}/ch_PP-OCRv4_det_infer.onnx',
+            "rec_model_dir": f'{resource_path}/ch_PP-OCRv4_rec_infer.onnx',
+            "cls_model_dir": f'{resource_path}/ch_ppocr_mobile_v2.0_cls_infer.onnx',
+            "det_db_box_thresh": key[1],
+            "use_dilation": key[2],
+            "det_db_unclip_ratio": key[3],
+        }
+
+        if key[0] is not None:
+            additional_ocr_params["lang"] = key[0]
+
+        # logger.info(f"additional_ocr_params: {additional_ocr_params}")
+
+        onnx_model = PaddleOCR(**additional_ocr_params)
+
+        if onnx_model is None:
+            logger.error('model init failed')
+            exit(1)
+        else:
+            return onnx_model
 
     except Exception as e:
         logger.exception(f'Error initializing model: {e}')