Update app.py

app.py

@@ -471,7 +471,7 @@ def plot_metrics(rounds, clients, memory_usage):
 def read_log_file2():
     with open("./log.txt", "r") as file:
         return file.read()
-
+import streamlit as st
 def main():
     st.markdown(print(streamlit.logger._loggers))
     st.write("## Federated Learning with Dynamic Models and Datasets for Mobile Devices")