Update app.py

app.py

@@ -19,9 +19,7 @@ sys.path.append('../..')
 #langchain
 from langchain.text_splitter import RecursiveCharacterTextSplitter, CharacterTextSplitter
 from langchain.embeddings import HuggingFaceEmbeddings
-from langchain.prompts import PromptTemplate
 from langchain.chains import RetrievalQA
-from langchain.prompts import ChatPromptTemplate
 from langchain.schema import StrOutputParser
 from langchain.schema.runnable import Runnable
 from langchain.schema.runnable.config import RunnableConfig
@@ -30,9 +28,8 @@ from langchain.chains import (
 from langchain.vectorstores import Chroma
 from langchain.memory import ConversationBufferMemory
 from langchain.chains import LLMChain
-from langchain.prompts.prompt import PromptTemplate
 from langchain.prompts.chat import ChatPromptTemplate, SystemMessagePromptTemplate
-from langchain.prompts import SystemMessagePromptTemplate, HumanMessagePromptTemplate, ChatPromptTemplate,  MessagesPlaceholder
+from langchain.prompts import SystemMessagePromptTemplate, HumanMessagePromptTemplate, ChatPromptTemplate
 from langchain.document_loaders import PyPDFDirectoryLoader
 from pydantic import BaseModel, Field
 from langchain.output_parsers import PydanticOutputParser
@@ -185,7 +182,7 @@ banner_tab_content = """
 """
 banner_tab = gr.Markdown(banner_tab_content)
 
-# Combine both interfaces into a single app
+# Combine interfaces into a single app
 app = gr.TabbedInterface(
     [banner_tab, image_gradio_app, chatbot_gradio_app],
     tab_names=["Welcome to Green Greta", "Green Greta Image Classification", "Green Greta Chat"],