adding Laama chat7b model

app.py

@@ -67,6 +67,7 @@ def audio_processor(wav_file,API_key,wav_model='small',llm='HuggingFace',tempera
     global vector_db
     vector_db = FAISS.from_documents(documents=texts, embedding= embedding_model)
     global qa
+    
     if llm == 'HuggingFace':
         chat = llm_ops.get_hugging_face_model(
                             model_id="meta-llama/Llama-2-7b",