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import os
from typing import Any, Dict, Generator, List
import ollama
from loguru import logger as log
from rag.retriever.vector import Document
from .abstract import AbstractGenerator
from .prompt import ANSWER_INSTRUCTION, Prompt
class Ollama(metaclass=AbstractGenerator):
def __init__(self) -> None:
self.model = os.environ["GENERATOR_MODEL"]
log.debug(f"Using {self.model} for generator...")
def __context(self, documents: List[Document]) -> str:
results = [
f"Document: {i}\ntitle: {doc.title}\ntext: {doc.text}"
for i, doc in enumerate(documents)
]
return "\n".join(results)
def __metaprompt(self, prompt: Prompt) -> str:
metaprompt = (
"Answer the question based only on the following context:\n"
"<context>\n"
f"{self.__context(prompt.documents)}\n\n"
"</context>\n"
f"{ANSWER_INSTRUCTION}"
f"Question: {prompt.query.strip()}\n\n"
"Answer:"
)
return metaprompt
def generate(self, prompt: Prompt) -> Generator[Any, Any, Any]:
log.debug("Generating answer with ollama...")
metaprompt = self.__metaprompt(prompt)
for chunk in ollama.generate(model=self.model, prompt=metaprompt, stream=True):
yield chunk["response"]
def chat(
self, prompt: Prompt, messages: List[Dict[str, str]]
) -> Generator[Any, Any, Any]:
log.debug("Generating answer with ollama...")
metaprompt = self.__metaprompt(prompt)
messages.append({"role": "user", "content": metaprompt})
for chunk in ollama.chat(model=self.model, messages=messages, stream=True):
yield chunk["message"]["content"]
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