Update app.py

app.py

@@ -23,10 +23,9 @@ def define_embeddings_llm(openai_key):
     embeddings = HuggingFaceEmbeddings(
                 model_name="sentence-transformers/all-MiniLM-L6-v2"
             )
-    llm = HuggingFaceHub(repo_id="MBZUAI/LaMini-Flan-T5-248M",
-                         model_kwargs={"max_length":2048,
-                                       "temperature":0.2}
-                        )
+    model_id = "lmsys/vicuna-7b-v1.3"
+    pipe = pipeline("text-generation", model=model, max_length=2048)
+    llm = HuggingFacePipeline(pipeline=pipe)
   langchain.llm_cache = InMemoryCache()
   return embeddings,llm