Update llama lib

app.py

@@ -1,17 +1,16 @@
 import os
 import gradio as gr
-from llama_index import VectorStoreIndex, SimpleDirectoryReader, SummaryIndex
+from llama_index.core import VectorStoreIndex, SimpleDirectoryReader, SummaryIndex, ServiceContext
 from llama_index.readers import SimpleWebPageReader
 from llama_index.llms import MistralAI
 from llama_index.embeddings import MistralAIEmbedding
-from llama_index import ServiceContext
 from llama_index.query_engine import RetrieverQueryEngine
 
-title = "Gaia Mistral Chat RAG URL Demo"
+title = "Gaia Mistral 8x7b Chat RAG URL Demo"
 description = "Example of an assistant with Gradio, RAG from url and Mistral AI via its API"
 placeholder = "Vous pouvez me posez une question sur ce contexte, appuyer sur Entrée pour valider"
 placeholder_url = "Extract text from this url"
-llm_model = 'mistral-small'
+llm_model = 'open-mixtral-8x7b'
 # choose api_key from .env or from input field
 # placeholder_api_key = "API key"
 env_api_key = os.environ.get("MISTRAL_API_KEY")