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"""Main entrypoint for the app."""
import os
from timeit import default_timer as timer
from typing import List, Optional
from dotenv import find_dotenv, load_dotenv
from langchain_community.embeddings import HuggingFaceInstructEmbeddings
from langchain.vectorstores.chroma import Chroma
from langchain.vectorstores.faiss import FAISS
from app_modules.llm_loader import LLMLoader
from app_modules.utils import get_device_types, init_settings
found_dotenv = find_dotenv(".env")
if len(found_dotenv) == 0:
found_dotenv = find_dotenv(".env.example")
print(f"loading env vars from: {found_dotenv}")
load_dotenv(found_dotenv, override=False)
# Constants
init_settings()
if os.environ.get("LANGCHAIN_DEBUG") == "true":
import langchain
langchain.debug = True
if os.environ.get("USER_CONVERSATION_SUMMARY_BUFFER_MEMORY") == "true":
from app_modules.llm_qa_chain_with_memory import QAChain
print("using llm_qa_chain_with_memory")
else:
from app_modules.llm_qa_chain import QAChain
print("using llm_qa_chain")
def app_init():
# https://github.com/huggingface/transformers/issues/17611
os.environ["CURL_CA_BUNDLE"] = ""
hf_embeddings_device_type, hf_pipeline_device_type = get_device_types()
print(f"hf_embeddings_device_type: {hf_embeddings_device_type}")
print(f"hf_pipeline_device_type: {hf_pipeline_device_type}")
hf_embeddings_model_name = (
os.environ.get("HF_EMBEDDINGS_MODEL_NAME") or "hkunlp/instructor-xl"
)
n_threds = int(os.environ.get("NUMBER_OF_CPU_CORES") or "4")
index_path = os.environ.get("FAISS_INDEX_PATH") or os.environ.get(
"CHROMADB_INDEX_PATH"
)
using_faiss = os.environ.get("FAISS_INDEX_PATH") is not None
llm_model_type = os.environ.get("LLM_MODEL_TYPE")
start = timer()
embeddings = HuggingFaceInstructEmbeddings(
model_name=hf_embeddings_model_name,
model_kwargs={"device": hf_embeddings_device_type},
)
end = timer()
print(f"Completed in {end - start:.3f}s")
start = timer()
print(f"Load index from {index_path} with {'FAISS' if using_faiss else 'Chroma'}")
if not os.path.isdir(index_path):
raise ValueError(f"{index_path} does not exist!")
elif using_faiss:
vectorstore = FAISS.load_local(index_path, embeddings)
else:
vectorstore = Chroma(
embedding_function=embeddings, persist_directory=index_path
)
end = timer()
print(f"Completed in {end - start:.3f}s")
start = timer()
llm_loader = LLMLoader(llm_model_type)
llm_loader.init(n_threds=n_threds, hf_pipeline_device_type=hf_pipeline_device_type)
qa_chain = QAChain(vectorstore, llm_loader)
end = timer()
print(f"Completed in {end - start:.3f}s")
return llm_loader, qa_chain
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