refactor(magic_pdf): replace AtomModelSingleton with ocr_model_init for OCR model instantiation

- Remove usage of AtomModelSingleton for OCR model initialization- Use ocr_model_init function for creating OCR model instance
- Update import statement to include ocr_model_init- Comment out old OCR model initialization code

magic_pdf/pdf_parse_union_core_v2.py

@@ -31,7 +31,7 @@ try:
 except ImportError:
     pass
 
-from magic_pdf.model.sub_modules.model_init import AtomModelSingleton
+from magic_pdf.model.sub_modules.model_init import AtomModelSingleton, ocr_model_init
 from magic_pdf.para.para_split_v3 import para_split
 from magic_pdf.pre_proc.construct_page_dict import ocr_construct_page_component_v2
 from magic_pdf.pre_proc.cut_image import ocr_cut_image_and_table
@@ -231,10 +231,15 @@ def txt_spans_extract_v2(pdf_page, spans, all_bboxes, all_discarded_blocks, lang
     if len(empty_spans) > 0:
 
         # 初始化ocr模型
-        atom_model_manager = AtomModelSingleton()
-        ocr_model = atom_model_manager.get_atom_model(
-            atom_model_name="ocr",
-            ocr_show_log=False,
+        # atom_model_manager = AtomModelSingleton()
+        # ocr_model = atom_model_manager.get_atom_model(
+        #     atom_model_name="ocr",
+        #     ocr_show_log=False,
+        #     det_db_box_thresh=0.3,
+        #     lang=lang
+        # )
+        ocr_model = ocr_model_init(
+            show_log=False,
             det_db_box_thresh=0.3,
             lang=lang
         )