Update app.py

app.py

@@ -21,6 +21,7 @@ import pandas as pd
 import gradio as gr
 from fairlearn.metrics import demographic_parity_difference, demographic_parity_ratio, equalized_odds_difference
 from fairlearn.metrics import MetricFrame
+import os
 
 #This is a GPT-2 fine-tuning process where a pre-trained model is retrained to reduce bias by learning patterns of biased text prompts and their neutral alternatives.
 model_name="gpt2"