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106 lines
4.3 KiB
Python
106 lines
4.3 KiB
Python
import os
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from typing import Any, List
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from langchain.chains import ConversationalRetrievalChain
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from langchain.chat_models import ChatOpenAI, ChatVertexAI
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from langchain.chat_models.anthropic import ChatAnthropic
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from langchain.docstore.document import Document
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from langchain.embeddings.openai import OpenAIEmbeddings
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from langchain.llms import VertexAI
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from langchain.memory import ConversationBufferMemory
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from langchain.vectorstores import SupabaseVectorStore
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from llm import LANGUAGE_PROMPT
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from supabase import Client, create_client
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from utils import ChatMessage
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class CustomSupabaseVectorStore(SupabaseVectorStore):
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'''A custom vector store that uses the match_vectors table instead of the vectors table.'''
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user_id: str
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def __init__(self, client: Client, embedding: OpenAIEmbeddings, table_name: str, user_id: str = "none"):
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super().__init__(client, embedding, table_name)
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self.user_id = user_id
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def similarity_search(
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self,
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query: str,
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user_id: str = "none",
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table: str = "match_vectors",
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k: int = 4,
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threshold: float = 0.5,
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**kwargs: Any
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) -> List[Document]:
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vectors = self._embedding.embed_documents([query])
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query_embedding = vectors[0]
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res = self._client.rpc(
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table,
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{
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"query_embedding": query_embedding,
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"match_count": k,
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"p_user_id": self.user_id,
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},
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).execute()
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match_result = [
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(
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Document(
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metadata=search.get("metadata", {}), # type: ignore
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page_content=search.get("content", ""),
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),
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search.get("similarity", 0.0),
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)
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for search in res.data
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if search.get("content")
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]
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documents = [doc for doc, _ in match_result]
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return documents
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def get_environment_variables():
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'''Get the environment variables.'''
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openai_api_key = os.getenv("OPENAI_API_KEY")
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anthropic_api_key = os.getenv("ANTHROPIC_API_KEY")
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supabase_url = os.getenv("SUPABASE_URL")
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supabase_key = os.getenv("SUPABASE_SERVICE_KEY")
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return openai_api_key, anthropic_api_key, supabase_url, supabase_key
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def create_clients_and_embeddings(openai_api_key, supabase_url, supabase_key):
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'''Create the clients and embeddings.'''
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embeddings = OpenAIEmbeddings(openai_api_key=openai_api_key)
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supabase_client = create_client(supabase_url, supabase_key)
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return supabase_client, embeddings
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def get_qa_llm(chat_message: ChatMessage, user_id: str):
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'''Get the question answering language model.'''
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openai_api_key, anthropic_api_key, supabase_url, supabase_key = get_environment_variables()
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supabase_client, embeddings = create_clients_and_embeddings(openai_api_key, supabase_url, supabase_key)
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vector_store = CustomSupabaseVectorStore(
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supabase_client, embeddings, table_name="vectors", user_id=user_id)
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memory = ConversationBufferMemory(
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memory_key="chat_history", return_messages=True)
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ConversationalRetrievalChain.prompts = LANGUAGE_PROMPT
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qa = None
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# this overwrites the built-in prompt of the ConversationalRetrievalChain
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ConversationalRetrievalChain.prompts = LANGUAGE_PROMPT
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if chat_message.model.startswith("gpt"):
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qa = ConversationalRetrievalChain.from_llm(
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ChatOpenAI(
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model_name=chat_message.model, openai_api_key=openai_api_key,
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temperature=chat_message.temperature, max_tokens=chat_message.max_tokens),
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vector_store.as_retriever(), memory=memory, verbose=True,
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max_tokens_limit=1024)
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elif chat_message.model.startswith("vertex"):
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qa = ConversationalRetrievalChain.from_llm(
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ChatVertexAI(), vector_store.as_retriever(), memory=memory, verbose=False, max_tokens_limit=1024)
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elif anthropic_api_key and chat_message.model.startswith("claude"):
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qa = ConversationalRetrievalChain.from_llm(
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ChatAnthropic(
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model=chat_message.model, anthropic_api_key=anthropic_api_key, temperature=chat_message.temperature, max_tokens_to_sample=chat_message.max_tokens), vector_store.as_retriever(), memory=memory, verbose=False, max_tokens_limit=102400)
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return qa
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