Fixed first instance of USER in Intro

Also added some comments querying the validity of history[0]

app.py

@@ -151,7 +151,7 @@ def chat(
     username = username.strip()
     username = username or "USER"
 
-    intro = f'''The following is a verbose and detailed conversation between an AI assistant called FRITZ, and a human user called USER. FRITZ is intelligent, knowledgeable, wise and polite.
+    intro = f'''The following is a verbose and detailed conversation between an AI assistant called FRITZ, and a human user called {username}. FRITZ is intelligent, knowledgeable, wise and polite.
 
     {username}: What year was the french revolution?
     FRITZ: The French Revolution started in 1789, and lasted 10 years until 1799.
@@ -170,6 +170,7 @@ def chat(
     if len(history) == 0:
         # no history, so lets reset chat state
         model.resetState()
+        # Is it necessary to keep history[0]? We just keep appending to it, and only ever use it to check if the username has changed.
         history = [[], model.emptyState]
         print("reset chat state")
     else:
@@ -208,6 +209,7 @@ def chat(
 
     gc.collect()
     history[0].append((prompt, generated_text))
+    # Again, history[0] seems redundant. Also, not clear to me why we would want to return it twice?
     return history[0], [history[0], out["state"]]