Update app.py

app.py

@@ -11,12 +11,15 @@ from langchain_community.document_loaders import UnstructuredMarkdownLoader
 from langchain_text_splitters import MarkdownHeaderTextSplitter
 from langchain_community.vectorstores import Chroma
 from langchain.chains.combine_documents import create_stuff_documents_chain
-from langchain.chains.retrieval import create_retrieval_chain
+from langchain.chains import create_retrieval_chain
 from langchain_core.prompts import PromptTemplate
 from huggingface_hub import InferenceClient
 from langchain_core.language_models.llms import LLM
 from typing import Optional, List, Any
 
+# Fix OpenMP environment variable issue
+os.environ["OMP_NUM_THREADS"] = "1"
+
 # Load environment variables first
 # load_dotenv() # This will need commented out on HuggingFace. To run the code yourself on your device, keep this and comment out the api_key var
 # via os.getenv