feat(post_proc): enhance title block processing with average line height

- Add average line height calculation for title blocks
- Include page number in title dictionary
- Improve title optimization prompt for better hierarchy- Implement retry mechanism for JSON decoding errors
- Add error logging for title count mismatch

magic_pdf/post_proc/llm_aided.py

@@ -83,24 +83,38 @@ def llm_aided_title(pdf_info_dict, title_aided_config):
             if block["type"] == "title":
                 origin_title_list.append(block)
                 title_text = merge_para_with_text(block)
-                title_dict[f"{i}"] = title_text
+                page_line_height_list = []
+                for line in block['lines']:
+                    bbox = line['bbox']
+                    page_line_height_list.append(int(bbox[3] - bbox[1]))
+                if len(page_line_height_list) > 0:
+                    line_avg_height = sum(page_line_height_list) / len(page_line_height_list)
+                else:
+                    line_avg_height = int(block['bbox'][3] - block['bbox'][1])
+                title_dict[f"{i}"] = [title_text, line_avg_height, int(page_num[5:])+1]
                 i += 1
     # logger.info(f"Title list: {title_dict}")
 
     title_optimize_prompt = f"""输入的内容是一篇文档中所有标题组成的字典，请根据以下指南优化标题的结果，使结果符合正常文档的层次结构：
 
-1. 保留原始内容：
+1. 字典中每个value均为一个list，包含以下元素：
+    - 标题文本
+    - 文本行高是标题所在块的平均行高
+    - 标题所在的页码
+
+2. 保留原始内容：
     - 输入的字典中所有元素都是有效的，不能删除字典中的任何元素
     - 请务必保证输出的字典中元素的数量和输入的数量一致
 
-2. 保持字典内key-value的对应关系不变
+3. 保持字典内key-value的对应关系不变
 
-3. 优化层次结构：
+4. 优化层次结构：
     - 为每个标题元素添加适当的层次结构
-    - 标题层级应具有连续性，不能跳过某一层级
+    - 行高较大的标题一般是更高级别的标题
+    - 标题从前至后的层级必须是连续的，不能跳过层级
     - 标题层级最多为4级，不要添加过多的层级
-    - 优化后的标题为一个整数，代表该标题的层级
-
+    - 优化后的标题只保留代表该标题的层级的整数，不要保留其他信息
+    
 IMPORTANT: 
 请直接返回优化过的由标题层级组成的json，返回的json不需要格式化。
 
@@ -110,24 +124,36 @@ Input title list:
 Corrected title list:
 """
 
-    completion = client.chat.completions.create(
-        model=title_aided_config["model"],
-        messages=[
-            {'role': 'user', 'content': title_optimize_prompt}],
-        temperature=0.7,
-    )
-
-    json_completion = json.loads(completion.choices[0].message.content)
-
-    # logger.info(f"Title completion: {json_completion}")
+    retry_count = 0
+    max_retries = 3
+    json_completion = None
 
-    # logger.info(f"len(json_completion): {len(json_completion)}, len(title_dict): {len(title_dict)}")
-    if len(json_completion) == len(title_dict):
+    while retry_count < max_retries:
         try:
-            for i, origin_title_block in enumerate(origin_title_list):
-               origin_title_block["level"] = int(json_completion[str(i)])
+            completion = client.chat.completions.create(
+                model=title_aided_config["model"],
+                messages=[
+                    {'role': 'user', 'content': title_optimize_prompt}],
+                temperature=0.7,
+            )
+            json_completion = json.loads(completion.choices[0].message.content)
+
+            # logger.info(f"Title completion: {json_completion}")
+            # logger.info(f"len(json_completion): {len(json_completion)}, len(title_dict): {len(title_dict)}")
+
+            if len(json_completion) == len(title_dict):
+                for i, origin_title_block in enumerate(origin_title_list):
+                    origin_title_block["level"] = int(json_completion[str(i)])
+                break
+            else:
+                logger.warning("The number of titles in the optimized result is not equal to the number of titles in the input.")
+                retry_count += 1
         except Exception as e:
-            logger.exception(e)
-    else:
-        logger.error("The number of titles in the optimized result is not equal to the number of titles in the input.")
-
+            if e is json.JSONDecodeError:
+                logger.warning(f"JSON decode error on attempt {retry_count + 1}: {e}")
+            else:
+                logger.exception(e)
+            retry_count += 1
+
+    if json_completion is None:
+        logger.error("Failed to decode JSON after maximum retries.")