712 lines
24 KiB
Python
712 lines
24 KiB
Python
import pickle
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import re
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import numpy as np
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import os
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from typing import Optional
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import requests
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import asyncio
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def encode_texts_via_api(texts, batch_size=32):
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"""通过 API 接口编码文本"""
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if not texts:
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return np.array([])
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try:
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# FastAPI 服务地址
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fastapi_url = os.getenv('FASTAPI_URL', 'http://127.0.0.1:8001')
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api_endpoint = f"{fastapi_url}/api/v1/embedding/encode"
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# 调用编码接口
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request_data = {
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"texts": texts,
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"batch_size": batch_size
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}
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response = requests.post(
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api_endpoint,
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json=request_data,
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timeout=60 # 增加超时时间
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)
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if response.status_code == 200:
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result_data = response.json()
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if result_data.get("success"):
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embeddings_list = result_data.get("embeddings", [])
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print(f"API编码成功，处理了 {len(texts)} 个文本，embedding维度: {len(embeddings_list[0]) if embeddings_list else 0}")
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return np.array(embeddings_list)
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else:
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error_msg = result_data.get('error', '未知错误')
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print(f"API编码失败: {error_msg}")
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raise Exception(f"API编码失败: {error_msg}")
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else:
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print(f"API请求失败: {response.status_code} - {response.text}")
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raise Exception(f"API请求失败: {response.status_code}")
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except Exception as e:
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print(f"API编码异常: {e}")
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raise
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def clean_text(text):
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"""
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清理文本，去除特殊字符和无意义字符
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Args:
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text (str): 原始文本
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Returns:
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str: 清理后的文本
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"""
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# 去除HTML标签
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text = re.sub(r'<[^>]+>', '', text)
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# 去除多余的空白字符
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text = re.sub(r'\s+', ' ', text)
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# 去除控制字符和非打印字符，但保留Unicode文字字符
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text = re.sub(r'[\x00-\x08\x0B\x0C\x0E-\x1F\x7F]', '', text)
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# 去除首尾空白
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text = text.strip()
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return text
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def is_meaningful_line(text):
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"""
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判断一行文本是否有意义
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Args:
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text (str): 文本行
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Returns:
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bool: 是否有意义
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"""
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if not text or len(text.strip()) < 5:
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return False
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# 过滤纯数字行
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if text.strip().isdigit():
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return False
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# 过滤只有符号的行
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if re.match(r'^[^\w\u4e00-\u9fa5]+$', text):
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return False
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# 过滤常见的无意义行
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meaningless_patterns = [
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r'^[-=_]{3,}$', # 分割线
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r'^第\d+页$', # 页码
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r'^\d+\.\s*$', # 只有编号
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r'^[a-zA-Z]\.\s*$', # 只有一个字母编号
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]
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for pattern in meaningless_patterns:
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if re.match(pattern, text.strip()):
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return False
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return True
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def embed_document(input_file='document.txt', output_file='embedding.pkl',
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chunking_strategy='line', **chunking_params):
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"""
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读取文档文件，使用指定分块策略进行embedding，保存为pickle文件
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Args:
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input_file (str): 输入文档文件路径
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output_file (str): 输出pickle文件路径
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chunking_strategy (str): 分块策略，可选 'line', 'paragraph'
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**chunking_params: 分块参数
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- 对于 'line' 策略：无额外参数
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- 对于 'paragraph' 策略：
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- max_chunk_size: 最大chunk大小（默认1000）
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- overlap: 重叠大小（默认100）
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- min_chunk_size: 最小chunk大小（默认200）
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- separator: 段落分隔符（默认'\n'）
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"""
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try:
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with open(input_file, 'r', encoding='utf-8') as f:
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content = f.read()
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chunks = []
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if chunking_strategy == 'line':
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# 原有的按行处理逻辑
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lines = content.split('\n')
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original_count = len(lines)
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for line in lines:
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# 清理文本
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cleaned_text = clean_text(line)
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# 检查是否有意义
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if is_meaningful_line(cleaned_text):
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chunks.append(cleaned_text)
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print(f"使用按行分块策略")
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print(f"原始行数: {original_count}")
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print(f"清理后有效句子数: {len(chunks)}")
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print(f"过滤比例: {((original_count - len(chunks)) / original_count * 100):.1f}%")
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elif chunking_strategy == 'paragraph':
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# 新的段落级分块策略
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# 设置默认参数
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params = {
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'max_chunk_size': 1000,
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'overlap': 100,
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'min_chunk_size': 200,
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'separator': '\n'
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}
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params.update(chunking_params)
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# 先清理整个文档的空白字符
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cleaned_content = clean_text(content)
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# 使用段落分块
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chunks = paragraph_chunking(cleaned_content, **params)
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print(f"使用段落级分块策略")
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print(f"文档总长度: {len(content)} 字符")
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print(f"分块数量: {len(chunks)}")
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if chunks:
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print(f"平均chunk大小: {sum(len(chunk) for chunk in chunks) / len(chunks):.1f} 字符")
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print(f"最大chunk大小: {max(len(chunk) for chunk in chunks)} 字符")
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print(f"最小chunk大小: {min(len(chunk) for chunk in chunks)} 字符")
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elif chunking_strategy == 'smart':
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# 智能分块策略，自动检测文档格式
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params = {
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'max_chunk_size': 1000,
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'overlap': 100,
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'min_chunk_size': 200
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}
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params.update(chunking_params)
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# 使用智能分块
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chunks = smart_chunking(content, **params)
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print(f"使用智能分块策略")
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print(f"文档总长度: {len(content)} 字符")
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print(f"分块数量: {len(chunks)}")
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if chunks:
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print(f"平均chunk大小: {sum(len(chunk) for chunk in chunks) / len(chunks):.1f} 字符")
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print(f"最大chunk大小: {max(len(chunk) for chunk in chunks)} 字符")
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print(f"最小chunk大小: {min(len(chunk) for chunk in chunks)} 字符")
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else:
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raise ValueError(f"不支持的分块策略: {chunking_strategy}")
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if not chunks:
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print("警告：没有找到有效的内容块！")
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return None
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print(f"正在处理 {len(chunks)} 个内容块...")
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# 使用API接口进行编码
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print("使用API接口进行编码...")
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chunk_embeddings = encode_texts_via_api(chunks, batch_size=32)
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embedding_data = {
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'chunks': chunks,
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'embeddings': chunk_embeddings,
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'chunking_strategy': chunking_strategy,
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'chunking_params': chunking_params,
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'model_path': 'api_service'
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}
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with open(output_file, 'wb') as f:
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pickle.dump(embedding_data, f)
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print(f"已保存嵌入向量到 {output_file}")
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return embedding_data
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except FileNotFoundError:
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print(f"错误：找不到文件 {input_file}")
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return None
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except Exception as e:
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print(f"处理文档时出错：{e}")
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return None
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def paragraph_chunking(text, max_chunk_size=1000, overlap=100, min_chunk_size=200, separator='\n\n'):
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"""
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段落级智能分块函数 - 使用固定chunk大小分块，不按页面分割
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Args:
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text (str): 输入文本
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max_chunk_size (int): 最大chunk大小（字符数）
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overlap (int): 重叠部分大小（字符数）
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min_chunk_size (int): 最小chunk大小（字符数）
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separator (str): 段落分隔符
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Returns:
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list: 分块后的文本列表
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"""
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if not text or not text.strip():
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return []
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# 直接使用固定长度分块策略，不考虑页面标记
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return _fixed_length_chunking(text, max_chunk_size, overlap, min_chunk_size)
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def _split_long_content(content, max_size, min_size, separator):
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"""
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拆分过长的内容
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Args:
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content (str): 要拆分的内容
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max_size (int): 最大大小
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min_size (int): 最小大小
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separator (str): 分隔符
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Returns:
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list: 拆分后的块列表
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"""
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if len(content) <= max_size:
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return [content]
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# 尝试按段落拆分
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paragraphs = content.split(separator)
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if len(paragraphs) > 1:
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chunks = []
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current_chunk = ""
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for para in paragraphs:
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if not current_chunk:
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current_chunk = para
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elif len(current_chunk + separator + para) <= max_size:
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current_chunk += separator + para
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else:
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if current_chunk:
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chunks.append(current_chunk)
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current_chunk = para
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if current_chunk:
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chunks.append(current_chunk)
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return chunks
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# 如果不能按段落拆分，按句子拆分
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sentences = _split_into_sentences(content)
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chunks = []
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current_chunk = ""
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for sentence in sentences:
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if not current_chunk:
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current_chunk = sentence
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elif len(current_chunk + " " + sentence) <= max_size:
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current_chunk += " " + sentence
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else:
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if current_chunk:
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chunks.append(current_chunk)
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current_chunk = sentence
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if current_chunk:
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chunks.append(current_chunk)
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return chunks
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def _split_into_sentences(text):
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"""
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将文本拆分为句子
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Args:
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text (str): 输入文本
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Returns:
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list: 句子列表
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"""
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# 简单的句子分割（可以根据需要改进）
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import re
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# 按句号、问号、感叹号分割，但保留数字中的点
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sentence_endings = re.compile(r'(?<=[.!?])\s+(?=[\dA-Z\u4e00-\u9fa5])')
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sentences = sentence_endings.split(text.strip())
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return [s.strip() for s in sentences if s.strip()]
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def _create_overlap_chunk(previous_chunk, new_paragraph, overlap_size):
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"""
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创建带有重叠内容的新chunk
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Args:
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previous_chunk (str): 前一个chunk
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new_paragraph (str): 新段落
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overlap_size (int): 重叠大小
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Returns:
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str: 带重叠的新chunk
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"""
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if overlap_size <= 0:
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return new_paragraph
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# 从前一个chunk的末尾获取重叠内容
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overlap_text = previous_chunk[-overlap_size:] if len(previous_chunk) > overlap_size else previous_chunk
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# 尝试在句子边界处分割重叠内容
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sentences = _split_into_sentences(overlap_text)
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if len(sentences) > 1:
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# 去掉可能不完整的第一个句子
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overlap_text = " ".join(sentences[1:])
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elif len(overlap_text) > overlap_size * 0.5:
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# 如果只有一个句子且长度合适，保留它
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pass
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else:
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# 重叠内容太少，不使用重叠
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return new_paragraph
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return overlap_text + "\n\n" + new_paragraph
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def _add_overlap_to_chunk(previous_chunk, current_chunk, overlap_size):
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"""
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为当前chunk添加与前一个chunk的重叠
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Args:
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previous_chunk (str): 前一个chunk
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current_chunk (str): 当前chunk
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overlap_size (int): 重叠大小
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Returns:
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str: 带重叠的chunk
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"""
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if overlap_size <= 0:
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return current_chunk
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# 从前一个chunk的末尾获取重叠内容
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overlap_text = previous_chunk[-overlap_size:] if len(previous_chunk) > overlap_size else previous_chunk
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# 尝试在句子边界处分割
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sentences = _split_into_sentences(overlap_text)
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if len(sentences) > 1:
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overlap_text = " ".join(sentences[1:])
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return overlap_text + "\n\n" + current_chunk
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def smart_chunking(text, max_chunk_size=1000, overlap=100, min_chunk_size=200):
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"""
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智能分块函数，自动检测文档格式并选择最佳分块策略
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Args:
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text (str): 输入文本
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max_chunk_size (int): 最大chunk大小（字符数）
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overlap (int): 重叠部分大小（字符数）
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min_chunk_size (int): 最小chunk大小（字符数）
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Returns:
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list: 分块后的文本列表
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"""
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if not text or not text.strip():
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return []
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# 检测文档类型（支持 # Page 和 # File 格式）
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has_page_markers = '# Page' in text or '# File' in text
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has_paragraph_breaks = '\n\n' in text
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has_line_breaks = '\n' in text
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# 选择合适的分隔符和策略
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if has_page_markers:
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# 使用页面分隔符
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return _page_based_chunking(text, max_chunk_size, overlap, min_chunk_size)
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elif has_paragraph_breaks:
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# 使用段落分隔符
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return paragraph_chunking(text, max_chunk_size, overlap, min_chunk_size, '\n\n')
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elif has_line_breaks:
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# 使用行分隔符
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return _line_based_chunking(text, max_chunk_size, overlap, min_chunk_size)
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else:
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# 按固定长度分块
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return _fixed_length_chunking(text, max_chunk_size, overlap, min_chunk_size)
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def _page_based_chunking(text, max_chunk_size, overlap, min_chunk_size):
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"""基于页面的分块策略"""
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import re
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# 使用正则表达式分割页面（支持 # Page 和 # File 格式）
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page_pattern = r'#\s*(Page\s+\d+|File\s+[^\n]+)'
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pages = re.split(page_pattern, text)
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# 清理和过滤页面内容
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cleaned_pages = []
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for page in pages:
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page = page.strip()
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if page and len(page) > min_chunk_size * 0.3: # 过滤太小的页面
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cleaned_pages.append(page)
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if not cleaned_pages:
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return []
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# 如果页面内容过大，需要进一步分割
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chunks = []
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for page in cleaned_pages:
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if len(page) <= max_chunk_size:
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chunks.append(page)
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else:
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# 页面过大，需要分割
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sub_chunks = _split_long_content(page, max_chunk_size, min_chunk_size, '\n')
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chunks.extend(sub_chunks)
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# 添加重叠
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if overlap > 0 and len(chunks) > 1:
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chunks = _add_overlaps_to_chunks(chunks, overlap)
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return chunks
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def _line_based_chunking(text, max_chunk_size, overlap, min_chunk_size):
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"""基于行的分块策略"""
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lines = text.split('\n')
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chunks = []
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current_chunk = ""
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for line in lines:
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line = line.strip()
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if not line:
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continue
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if not current_chunk:
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current_chunk = line
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elif len(current_chunk + '\n' + line) <= max_chunk_size:
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current_chunk += '\n' + line
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else:
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if len(current_chunk) >= min_chunk_size:
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chunks.append(current_chunk)
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current_chunk = _create_overlap_for_line(current_chunk, line, overlap)
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else:
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# 当前行太长，需要分割
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split_chunks = _split_long_content(current_chunk + '\n' + line, max_chunk_size, min_chunk_size, '\n')
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if chunks and split_chunks:
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split_chunks[0] = _add_overlap_to_chunk(chunks[-1], split_chunks[0], overlap)
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chunks.extend(split_chunks[:-1])
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current_chunk = split_chunks[-1] if split_chunks else ""
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if current_chunk and len(current_chunk) >= min_chunk_size:
|
||
chunks.append(current_chunk)
|
||
elif current_chunk and chunks:
|
||
chunks[-1] += '\n' + current_chunk
|
||
|
||
return chunks
|
||
|
||
|
||
def _fixed_length_chunking(text, max_chunk_size, overlap, min_chunk_size):
|
||
"""固定长度分块策略"""
|
||
chunks = []
|
||
start = 0
|
||
|
||
while start < len(text):
|
||
end = start + max_chunk_size
|
||
|
||
if end >= len(text):
|
||
chunks.append(text[start:])
|
||
break
|
||
|
||
# 尝试在句号、问号或感叹号处分割
|
||
split_pos = end
|
||
for i in range(end, max(start, end - 100), -1):
|
||
if text[i] in '.!?。！？':
|
||
split_pos = i + 1
|
||
break
|
||
|
||
chunk = text[start:split_pos]
|
||
if len(chunk) >= min_chunk_size:
|
||
chunks.append(chunk)
|
||
start = split_pos - overlap if overlap > 0 else split_pos
|
||
else:
|
||
start += max_chunk_size // 2
|
||
|
||
return chunks
|
||
|
||
|
||
def _create_overlap_for_line(previous_chunk, new_line, overlap_size):
|
||
"""为行分块创建重叠"""
|
||
if overlap_size <= 0:
|
||
return new_line
|
||
|
||
# 从前一个chunk的末尾获取重叠内容
|
||
overlap_text = previous_chunk[-overlap_size:] if len(previous_chunk) > overlap_size else previous_chunk
|
||
|
||
# 尝试在合适的边界分割
|
||
last_newline = overlap_text.rfind('\n')
|
||
if last_newline > 0:
|
||
overlap_text = overlap_text[last_newline + 1:]
|
||
|
||
return overlap_text + '\n' + new_line
|
||
|
||
|
||
def _add_overlaps_to_chunks(chunks, overlap_size):
|
||
"""为chunks添加重叠"""
|
||
if overlap_size <= 0 or len(chunks) <= 1:
|
||
return chunks
|
||
|
||
result = [chunks[0]]
|
||
|
||
for i in range(1, len(chunks)):
|
||
previous_chunk = chunks[i-1]
|
||
current_chunk = chunks[i]
|
||
|
||
# 添加重叠
|
||
overlap_text = previous_chunk[-overlap_size:] if len(previous_chunk) > overlap_size else previous_chunk
|
||
|
||
# 尝试在合适的边界分割
|
||
last_newline = overlap_text.rfind('\n')
|
||
if last_newline > 0:
|
||
overlap_text = overlap_text[last_newline + 1:]
|
||
elif '.' in overlap_text:
|
||
# 尝试在句号处分割
|
||
last_period = overlap_text.rfind('.')
|
||
if last_period > 0:
|
||
overlap_text = overlap_text[last_period + 1:].strip()
|
||
|
||
if overlap_text:
|
||
combined_chunk = overlap_text + '\n\n' + current_chunk
|
||
result.append(combined_chunk)
|
||
else:
|
||
result.append(current_chunk)
|
||
|
||
return result
|
||
|
||
|
||
def split_document_by_pages(input_file='document.txt', output_file='pagination.txt'):
|
||
"""
|
||
按页或文件分割document.txt文件，将每页内容整理成一行写入pagination.txt
|
||
|
||
Args:
|
||
input_file (str): 输入文档文件路径
|
||
output_file (str): 输出序列化文件路径
|
||
"""
|
||
try:
|
||
with open(input_file, 'r', encoding='utf-8') as f:
|
||
lines = f.readlines()
|
||
|
||
pages = []
|
||
current_page = []
|
||
|
||
for line in lines:
|
||
line = line.strip()
|
||
|
||
# 检查是否是页分隔符（支持 # Page 和 # File 格式）
|
||
if re.match(r'^#\s*(Page|File)', line, re.IGNORECASE):
|
||
# 如果当前页有内容，保存当前页
|
||
if current_page:
|
||
# 将当前页内容合并成一行
|
||
page_content = ' '.join(current_page).strip()
|
||
if page_content: # 只保存非空页面
|
||
pages.append(page_content)
|
||
current_page = []
|
||
continue
|
||
|
||
# 如果不是页分隔符且有内容，添加到当前页
|
||
if line:
|
||
current_page.append(line)
|
||
|
||
# 处理最后一页
|
||
if current_page:
|
||
page_content = ' '.join(current_page).strip()
|
||
if page_content:
|
||
pages.append(page_content)
|
||
|
||
print(f"总共分割出 {len(pages)} 页")
|
||
|
||
# 写入序列化文件
|
||
with open(output_file, 'w', encoding='utf-8') as f:
|
||
for i, page_content in enumerate(pages, 1):
|
||
f.write(f"{page_content}\n")
|
||
|
||
print(f"已将页面内容序列化到 {output_file}")
|
||
return pages
|
||
|
||
except FileNotFoundError:
|
||
print(f"错误：找不到文件 {input_file}")
|
||
return []
|
||
except Exception as e:
|
||
print(f"分割文档时出错：{e}")
|
||
return []
|
||
|
||
def test_chunking_strategies():
|
||
"""
|
||
测试不同的分块策略，比较效果
|
||
"""
|
||
# 测试文本
|
||
test_text = """
|
||
第一段：这是一个测试段落。包含了多个句子。这是为了测试分块功能。
|
||
|
||
第二段：这是另一个段落。它也包含了多个句子，用来验证分块策略的效果。我们需要确保分块的质量。
|
||
|
||
第三段：这是第三个段落，内容比较长，包含了更多的信息。这个段落可能会触发分块逻辑，因为它可能会超过最大chunk大小的限制。我们需要确保在这种情况下，分块算法能够正确地处理，并且在句子边界进行分割。
|
||
|
||
第四段：这是第四个段落。它相对较短。
|
||
|
||
第五段：这是最后一个段落。它用来测试分块策略的完整性和准确性。
|
||
"""
|
||
|
||
print("=" * 60)
|
||
print("分块策略测试")
|
||
print("=" * 60)
|
||
|
||
# 测试1: 段落级分块（小chunk）
|
||
print("\n1. 段落级分块 - 小chunk (max_size=200):")
|
||
chunks_small = paragraph_chunking(test_text, max_chunk_size=200, overlap=50)
|
||
for i, chunk in enumerate(chunks_small):
|
||
print(f"Chunk {i+1} (长度: {len(chunk)}): {chunk[:50]}...")
|
||
|
||
# 测试2: 段落级分块（大chunk）
|
||
print("\n2. 段落级分块 - 大chunk (max_size=500):")
|
||
chunks_large = paragraph_chunking(test_text, max_chunk_size=500, overlap=100)
|
||
for i, chunk in enumerate(chunks_large):
|
||
print(f"Chunk {i+1} (长度: {len(chunk)}): {chunk[:50]}...")
|
||
|
||
# 测试3: 段落级分块（无重叠）
|
||
print("\n3. 段落级分块 - 无重叠:")
|
||
chunks_no_overlap = paragraph_chunking(test_text, max_chunk_size=300, overlap=0)
|
||
for i, chunk in enumerate(chunks_no_overlap):
|
||
print(f"Chunk {i+1} (长度: {len(chunk)}): {chunk[:50]}...")
|
||
|
||
print(f"\n测试总结:")
|
||
print(f"- 小chunk策略: {len(chunks_small)} 个chunks")
|
||
print(f"- 大chunk策略: {len(chunks_large)} 个chunks")
|
||
print(f"- 无重叠策略: {len(chunks_no_overlap)} 个chunks")
|
||
|
||
|
||
def demo_usage():
|
||
"""
|
||
演示如何使用新的分块功能
|
||
"""
|
||
print("=" * 60)
|
||
print("使用示例")
|
||
print("=" * 60)
|
||
|
||
print("\n1. 使用传统的按行分块:")
|
||
print("embed_document('document.txt', 'line_embedding.pkl', chunking_strategy='line')")
|
||
|
||
print("\n2. 使用段落级分块（默认参数）:")
|
||
print("embed_document('document.txt', 'paragraph_embedding.pkl', chunking_strategy='paragraph')")
|
||
|
||
print("\n3. 使用自定义参数的段落级分块:")
|
||
print("embed_document('document.txt', 'custom_embedding.pkl',")
|
||
print(" chunking_strategy='paragraph',")
|
||
print(" max_chunk_size=1500,")
|
||
print(" overlap=200,")
|
||
print(" min_chunk_size=300)")
|
||
|
||
|
||
|
||
# 如果直接运行此文件，执行测试
|
||
if __name__ == "__main__":
|
||
#test_chunking_strategies()
|
||
#demo_usage()
|
||
|
||
# 使用新的智能分块示例:
|
||
embed_document("./projects/test/dataset/all_hp_product_spec_book2506/document.txt",
|
||
"./projects/test/dataset/all_hp_product_spec_book2506/smart_embedding.pkl",
|
||
chunking_strategy='smart', # 使用智能分块策略
|
||
max_chunk_size=800, # 较小的chunk大小
|
||
overlap=100)
|
||
|
||
# 其他示例调用（注释掉的）:
|
||
# split_document_by_pages("/Users/moshui/Documents/felo/qwen-agent/projects/test/dataset/all_hp_product_spec_book2506/document.txt")
|
||
# embed_document("/Users/moshui/Documents/felo/qwen-agent/projects/test/dataset/all_hp_product_spec_book2506/document.txt") # 取消注释来运行
|