fix: change default device to cpu

app.py

@@ -82,7 +82,7 @@ def main():
         "--detector", type=str, default="yolov3", choices=["yolov3", "faster-rcnn"]
     )
     parser.add_argument(
-        "--device", type=str, default="cuda:0", choices=["cuda:0", "cpu"]
+        "--device", type=str, default="cpu", choices=["cuda:0", "cpu"]
     )
     parser.add_argument("--face-score-threshold", type=float, default=0.5)
     parser.add_argument("--landmark-score-threshold", type=float, default=0.3)