Update app.py

app.py

@@ -103,7 +103,7 @@ def load_recommender(paths, start_page=1):
     return 'Corpus Loaded.'
 
 
-def generate_text(prompt, engine="mlsgpt3"):
+def generate_text(prompt, engine=os.environ('Engine')):
     completions = openai.Completion.create(
         engine=engine,
         prompt=prompt,