Files
core-api/src/models/embeddings_ollama.py
T
2025-12-11 15:52:59 +01:00

137 lines
3.6 KiB
Python

"""
Ollama-based embedding client for text vectorization
Uses Ollama's embedding API instead of local sentence-transformers.
This eliminates the need for PyTorch and heavy ML dependencies.
"""
import logging
import httpx
from typing import List, Optional
from src.config import get_settings
logger = logging.getLogger(__name__)
settings = get_settings()
class OllamaEmbeddingClient:
"""Client for generating text embeddings using Ollama"""
def __init__(
self,
model_name: Optional[str] = None,
base_url: Optional[str] = None,
timeout: int = 30
):
"""
Initialize Ollama embedding client
Args:
model_name: Embedding model name (default: nomic-embed-text)
base_url: Ollama base URL (default from settings)
timeout: Request timeout in seconds
"""
self.model_name = model_name or settings.embedding_model
self.base_url = (base_url or settings.ollama_base_url).rstrip("/")
self.timeout = timeout
self.dimension = settings.embedding_dimension
logger.info(f"Initializing OllamaEmbeddingClient with model: {self.model_name}")
logger.info(f"Ollama URL: {self.base_url}")
async def embed_text(self, text: str) -> List[float]:
"""
Generate embedding for a single text using Ollama
Args:
text: Input text to embed
Returns:
List of floats representing the embedding vector
"""
try:
async with httpx.AsyncClient(timeout=self.timeout) as client:
response = await client.post(
f"{self.base_url}/api/embeddings",
json={
"model": self.model_name,
"prompt": text
}
)
response.raise_for_status()
result = response.json()
return result["embedding"]
except Exception as e:
logger.error(f"Error generating embedding via Ollama: {e}")
raise
async def embed_batch(self, texts: List[str]) -> List[List[float]]:
"""
Generate embeddings for multiple texts
Args:
texts: List of input texts
Returns:
List of embedding vectors
"""
embeddings = []
for text in texts:
embedding = await self.embed_text(text)
embeddings.append(embedding)
return embeddings
def get_dimension(self) -> int:
"""
Get embedding dimension
Returns:
Embedding vector dimension
"""
return self.dimension
# Global instance
_embedding_client: Optional[OllamaEmbeddingClient] = None
def get_embedding_client() -> OllamaEmbeddingClient:
"""
Get or create global Ollama embedding client instance
Returns:
OllamaEmbeddingClient instance
"""
global _embedding_client
if _embedding_client is None:
_embedding_client = OllamaEmbeddingClient()
return _embedding_client
async def embed_text_async(text: str) -> List[float]:
"""
Async wrapper for embedding text
Args:
text: Input text
Returns:
Embedding vector
"""
client = get_embedding_client()
return await client.embed_text(text)
async def embed_batch_async(texts: List[str]) -> List[List[float]]:
"""
Async wrapper for batch embedding
Args:
texts: List of input texts
Returns:
List of embedding vectors
"""
client = get_embedding_client()
return await client.embed_batch(texts)