[UI] Make interface better and add name-checking.

app.py

@@ -16,10 +16,12 @@ if not has_prepared:
     prepare()
     has_prepared = True
 
-st.title('Entity Referring Classifier')
-st.caption('It knows exactly when you are calling it. - Version 2.0.1208.01')
-
-st.markdown('---')
+st.markdown("""
+<center><h2 style="padding-top: 0px; padding-bottom: 0px;">Entity Referring Classifier</h2></center>
+<center><small>Ver 2.0.1208.01</small></center>
+<center><h6><b>It knows exactly when you are calling it.</b></h6></center>
+<br/>
+""", unsafe_allow_html=True)
 
 livedemo_col1, livedemo_col2, livedemo_col3 = st.columns([12,1,6])
 
@@ -31,7 +33,10 @@ with livedemo_col1:
         sentence = st.text_input('Sentence Input:', 'Are you feeling good, Jimmy?',
                 help='The classifier is going to analyze this sentence.')
         if st.form_submit_button('🚀 Submit'):
-            st.session_state['running_status'] = STATUS_SUBMIT
+            if entity.lower() not in sentence.lower():
+                st.session_state['running_status'] = STATUS_ERROR
+            else:
+                st.session_state['running_status'] = STATUS_SUBMIT
 
     if st.session_state['running_status'] == STATUS_STOPPED:
         st.info('Type something and submit to start!')
@@ -41,6 +46,8 @@ with livedemo_col1:
         else:
             st.success('It is a **mentioning**!')
         st.caption(f'Submitted: `{sentence.lower()}` by `{datetime.now().strftime("%Y-%m-%d %H:%M:%S")}`')
+    elif st.session_state['running_status'] == STATUS_ERROR:
+        st.warning('The entity name is not in the sentence!')
 
 with livedemo_col2:
     st.empty()
@@ -51,7 +58,7 @@ with livedemo_col3:
     """)
     st.markdown("""
     Hi! I'm the Entity Referring Classifier.
-    I can help you find out when you are calling it.
+    I will fill this part later.
     """)
     st.markdown("""
     #### Terms