Update app.py

app.py

@@ -7,7 +7,7 @@ from transformers import AutoModel, AutoTokenizer
 from diffusers import StableDiffusionXLPipeline, UNet2DConditionModel, EulerDiscreteScheduler
 from parler_tts import ParlerTTSForConditionalGeneration
 import soundfile as sf
-from llama_index import GPTVectorStoreIndex, LLMPredictor, ServiceContext
+from llama_index import LLMPredictor, ServiceContext
 from llama_index.core import VectorStoreIndex, SimpleDirectoryReader
 from llama_index.langchain_helpers.text_splitter import RecursiveCharacterTextSplitter
 from langchain import OpenAI