knowledge/utils/vectorizer.py

import logging
from typing import List
import numpy as np
import requests
from requests.adapters import HTTPAdapter
from urllib3.util.retry import Retry

logger = logging.getLogger(__name__)

class Vectorizer:
    _instance = None
    
    def __init__(self):
        self.api_url = "http://172.16.8.98:11434/api/embeddings"
        self.model_name = "bge-m3"
        self.session = requests.Session()
        retries = Retry(total=3, backoff_factor=1)
        self.session.mount('http://', HTTPAdapter(max_retries=retries))

    @staticmethod
    def get_embedding(text: str) -> List[float]:
        return Vectorizer()._call_ollama_api(text)

    def _initialize_model(self):
        logger.info("Initialized Ollama API client for bge-m3 model")

    @classmethod
    def get_instance(cls):
        if cls._instance is None:
            cls._instance = cls()
        return cls._instance

    def chunk_text(self, text: str, chunk_size: int = 500) -> List[str]:
        tokens = self.tokenizer.tokenize(text)
        return [self.tokenizer.convert_tokens_to_string(tokens[i:i+chunk_size]) 
               for i in range(0, len(tokens), chunk_size)]

    def encode(self, text: str, batch_size: int = 32) -> List[float]:
        if not text:
            return [0.0] * 1024  # 调整为1024维以匹配数据库
        return self._call_ollama_api(text)

    def batch_encode(self, texts: List[str], batch_size: int = 64) -> List[List[float]]:
        return [self._call_ollama_api(text) for text in texts]

    def _call_ollama_api(self, text: str) -> List[float]:
        try:
            response = self.session.post(
                self.api_url,
                json={
                    "model": self.model_name,
                    "prompt": text,
                    "options": {"embedding_only": True}
                },
                timeout=30
            )
            response.raise_for_status()
            embedding_array = np.array(response.json()["embedding"])
            l2_norm = np.linalg.norm(embedding_array)
            if l2_norm > 0:
                embedding_array = embedding_array / l2_norm
            return embedding_array.tolist()
        except Exception as e:
            logger.error(f"API请求失败: {str(e)}")
            raise

if __name__ == "__main__":
    text ='腹痛'
    embedding = Vectorizer.get_embedding(text)
    print(embedding)
    print(len(embedding))