Update app.py

app.py

@@ -2,6 +2,7 @@ import gradio as gr
 from diffusers import StableDiffusionPipeline
 import torch
 import huggingface_hub as hf
+import os
 hf.login(token=os.environ['model_token'])
 #remember to login with token before loading model
 def text_to_hair(prompt, num_inference_steps=200, guidance_scale=9, model_path ="CVH-vn1210/hair-model"):