Update requirements.txt

requirements.txt

@@ -1,10 +1,12 @@
-llama-index>=0.10.34
-llama-index-agent-react
-llama-index-embeddings-huggingface>=0.1.6
-llama-index-llms-openai>=0.1.5
+langchain>=0.1.0
+langchain-community>=0.0.11
+langchain-openai>=0.0.2
+langchainhub>=0.1.14
 chromadb>=0.4.22
 tavily-python>=0.3.1
 python-dotenv>=1.0.0
 gradio>=4.19.2
 requests>=2.31.0
-pandas>=2.2.0
+pandas>=2.2.0
+sentence-transformers>=2.2.2
+torch>=2.0.0