race condition solved

app.py

@@ -36,11 +36,13 @@ def progress_update(update_text, percent_complete):
 
 
 def initiate_run():
-    st.session_state.running = True
-    st.session_state.input_error = st.session_state.on_target = st.session_state.off_target = None
 
+    # initialize state variables
+    st.session_state.transcripts = None
+    st.session_state.input_error = None
+    st.session_state.on_target = None
+    st.session_state.off_target = None
 
-def run():
     # initialize transcript DataFrame
     transcripts = pd.DataFrame(columns=[tiger.ID_COL, tiger.SEQ_COL])
 
@@ -76,12 +78,8 @@ def run():
 
     # run model if we have any transcripts
     elif len(transcripts) > 0:
-        st.session_state.on_target, st.session_state.off_target = tiger.tiger_exhibit(
-            transcripts=transcripts,
-            mode={v: k for k, v in tiger.RUN_MODES.items()}[st.session_state.mode],
-            check_off_targets=st.session_state.check_off_targets,
-            status_update_fn=progress_update
-        )
+        st.session_state.running = True
+        st.session_state.transcripts = transcripts
 
 
 if __name__ == '__main__':
@@ -94,6 +92,8 @@ if __name__ == '__main__':
         st.session_state.entry_method = ENTRY_METHODS['manual']
     if 'running' not in st.session_state:
         st.session_state.running = False
+    if 'transcripts' not in st.session_state:
+        st.session_state.transcripts = None
     if 'input_error' not in st.session_state:
         st.session_state.input_error = None
     if 'on_target' not in st.session_state:
@@ -180,8 +180,14 @@ if __name__ == '__main__':
             else:
                 st.write('We did not find any off-target effects!')
 
-    # run model if signalled to do so
-    if st.session_state.running:
-        run()
+    # run model until we clear inputs
+    if st.session_state.transcripts is not None:
+        st.session_state.on_target, st.session_state.off_target = tiger.tiger_exhibit(
+            transcripts=st.session_state.transcripts,
+            mode={v: k for k, v in tiger.RUN_MODES.items()}[st.session_state.mode],
+            check_off_targets=st.session_state.check_off_targets,
+            status_update_fn=progress_update
+        )
         st.session_state.running = False
+        st.session_state.transcripts = None
         st.experimental_rerun()