Langchain AttributeError

[bprasana07]

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Example Code

import os
import streamlit as st
import threading
import pickle
import time
from langchain import OpenAI
from langchain.chains import RetrievalQAWithSourcesChain
from langchain.text_splitter import RecursiveCharacterTextSplitter
from langchain.document_loaders import UnstructuredURLLoader
from langchain.embeddings import OpenAIEmbeddings
from langchain.vectorstores import FAISS
from langchain.vectorstores import VectorStore
os.environ\['OPENAI_API_KEY'\] ="sk-proj-\*\*\*\*"
llm = OpenAI(temperature=0.7, max_tokens=600)
loader = UnstructuredURLLoader(
urls=\[\*\*\*\*\*\])
data = loader.load()
len(data)
from langchain.document_loaders import TextLoader
rsplitter = RecursiveCharacterTextSplitter(chunk_size=1000,chunk_overlap=200)
chunks = rsplitter.split_documents(data)
len(chunks)
embeddings = OpenAIEmbeddings()
vectorindex_openai = FAISS.from_documents(chunks,embeddings)
class vectorindex_openai:
def __init__(self, vectors):
self.vectors = vectors
self.lock = None
file_path="vector_index.pkl"
with open (file_path, "wb") as f:
pickle.dump(vectorindex_openai, f)
if os.path.exists(file_path):
with open (file_path, "rb") as f:
vectorIndex = pickle.load(f)
chain = RetrievalQAWithSourcesChain.from_llm(llm=llm, retriever=vectorIndex.as_retriever())
chain

Description

Receiving AttributeError error when I'm trying to extract the text from few URLs and trying to the data into that vector index, please can someone assist ( I'm new to langchain ).

Error : AttributeError: type object 'vectorindex_openai' has no attribute 'as_retriever'

System Info

PS C:\Users\176760> python -m langchain_core.sys_info

System Information

OS: Windows
OS Version: 10.0.22631
Python Version: 3.12.5 (tags/v3.12.5:ff3bc82, Aug 6 2024, 20:45:27) [MSC v.1940 64 bit (AMD64)]

Package Information

langchain_core: 0.3.37
langchain: 0.3.19
langchain_community: 0.3.15
langsmith: 0.1.135
langchain_cli: 0.0.35
langchain_openai: 0.3.1
langchain_text_splitters: 0.3.6
langserve: 0.3.1

Other Dependencies

aiohttp: 3.10.10
aiohttp<4.0.0,>=3.8.3: Installed. No version info available.
async-timeout<5.0.0,>=4.0.0;: Installed. No version info available.
dataclasses-json: 0.6.7
fastapi: 0.115.6
gitpython: 3.1.43
gritql: 0.1.5
httpx: 0.27.2
httpx-sse: 0.4.0
jsonpatch<2.0,>=1.33: Installed. No version info available.
langchain-anthropic;: Installed. No version info available.
langchain-aws;: Installed. No version info available.
langchain-cohere;: Installed. No version info available.
langchain-community;: Installed. No version info available.
langchain-core<1.0.0,>=0.3.34: Installed. No version info available.
langchain-core<1.0.0,>=0.3.35: Installed. No version info available.
langchain-deepseek;: Installed. No version info available.
langchain-fireworks;: Installed. No version info available.
langchain-google-genai;: Installed. No version info available.
langchain-google-vertexai;: Installed. No version info available.
langchain-groq;: Installed. No version info available.
langchain-huggingface;: Installed. No version info available.
langchain-mistralai;: Installed. No version info available.
langchain-ollama;: Installed. No version info available.
langchain-openai;: Installed. No version info available.
langchain-text-splitters<1.0.0,>=0.3.6: Installed. No version info available.
langchain-together;: Installed. No version info available.
langchain-xai;: Installed. No version info available.
langserve[all]: Installed. No version info available.
langsmith<0.4,>=0.1.125: Installed. No version info available.
langsmith<0.4,>=0.1.17: Installed. No version info available.
numpy: 1.26.4
numpy<2,>=1.26.4;: Installed. No version info available.
numpy<3,>=1.26.2;: Installed. No version info available.
openai: 1.59.9
orjson: 3.10.7
packaging<25,>=23.2: Installed. No version info available.
pydantic: 2.10.6
pydantic-settings: 2.6.0
pydantic<3.0.0,>=2.5.2;: Installed. No version info available.
pydantic<3.0.0,>=2.7.4: Installed. No version info available.
pydantic<3.0.0,>=2.7.4;: Installed. No version info available.
PyYAML: 6.0.2
PyYAML>=5.3: Installed. No version info available.
requests: 2.32.3
requests-toolbelt: 1.0.0
requests<3,>=2: Installed. No version info available.
SQLAlchemy: 2.0.35
SQLAlchemy<3,>=1.4: Installed. No version info available.
sse-starlette: 1.8.2
tenacity: 8.5.0
tenacity!=8.4.0,<10,>=8.1.0: Installed. No version info available.
tenacity!=8.4.0,<10.0.0,>=8.1.0: Installed. No version info available.
tiktoken: 0.8.0
tomlkit: 0.13.2
typer[all]: Installed. No version info available.
typing-extensions>=4.7: Installed. No version info available.
uvicorn: 0.34.0