Update app.py

Correct pipeline mistake in the transformer import

app.py

@@ -12,13 +12,13 @@ from langchain_community.document_loaders import PyPDFLoader
 from langchain_classic.chains import RetrievalQA
 from langchain_community.llms import HuggingFacePipeline
 from langchain_community.embeddings import HuggingFaceEmbeddings
-from langchain_huggingface import HuggingFacePipeline
+# from langchain_huggingface import HuggingFacePipeline
 import torch
 
 from huggingface_hub import HfFolder
 import gradio as gr
 
-from transformers import AutoTokenizer, AutoModelForCausalLM, Pipeline, BitsAndBytesConfig
+from transformers import AutoTokenizer, AutoModelForCausalLM, pipeline, BitsAndBytesConfig
 
 ## You can use this section to suppress warnings generated by your code:
 def warn(*args, **kwargs):