try to reinitialize the conversition for each new session

Gradio_UI.py

@@ -24,6 +24,8 @@ from smolagents.agents import ActionStep, MultiStepAgent
 from smolagents.memory import MemoryStep
 from smolagents.utils import _is_package_available
 
+import gradio as gr
+
 
 def pull_messages_from_step(
     step_log: MemoryStep,