updated code from cuda to cpu

app.py

@@ -9,7 +9,7 @@ from detectron2.config import get_cfg
 from detectron2 import model_zoo
 import torch_utils
 import dnnlib
-Create output directory if it doesn't exist
+# Create output directory if it doesn't exist
 output_dir = "key/"
 os.makedirs(output_dir, exist_ok=True)
 output_file = os.path.join(output_dir, "keypoints.json")