Update app.py

app.py

@@ -50,7 +50,7 @@ st.markdown(
     'Simulate A/B optimization with policy gradient reinforcement learning')
 
 
-learning_rate = float(st.text_input('Learning rate', value=0.1))
+lr = float(st.text_input('Learning rate', value=0.1))
 
 prob_A = float(st.text_input('Click probability of ad A', value=0.4))