where are input1.jpg and input2.jpg? And is there gtk3 support ?

[jiapei100]

longervision-GT72-6QE% python demo/demo.py --config-file configs/COCO-InstanceSegmentation/mask_rcnn_R_50_FPN_3x.yaml \
  --input ./demo/17790319373_bd19b24cfc_k.jpg \ 
  --opts MODEL.WEIGHTS detectron2://COCO-InstanceSegmentation/mask_rcnn_R_50_FPN_3x/137849600/model_final_f10217.pkl
[10/13 17:38:38 detectron2]: Arguments: Namespace(confidence_threshold=0.5, config_file='configs/COCO-InstanceSegmentation/mask_rcnn_R_50_FPN_3x.yaml', input=['./demo/17790319373_bd19b24cfc_k.jpg'], opts=['MODEL.WEIGHTS', 'detectron2://COCO-InstanceSegmentation/mask_rcnn_R_50_FPN_3x/137849600/model_final_f10217.pkl'], output=None, video_input=None, webcam=False)
WARNING [10/13 17:38:38 d2.config.compat]: Config 'configs/COCO-InstanceSegmentation/mask_rcnn_R_50_FPN_3x.yaml' has no VERSION. Assuming it to be compatible with latest v2.
[10/13 17:38:42 detectron2]: ./demo/17790319373_bd19b24cfc_k.jpg: detected 13 instances in 0.37s
Traceback (most recent call last):
  File "demo/demo.py", line 95, in <module>
    cv2.imshow("COCO detections", visualized_output.get_image()[:, :, ::-1])
cv2.error: OpenCV(4.1.1) /io/opencv/modules/highgui/src/window.cpp:627: error: (-2:Unspecified error) The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Cocoa support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script in function 'cvShowImage'

[ppwwyyxx]

Your opencv installation cannot open a window. This is unrelated to detectron2.

If you don't know how to fix your opencv, you can use --output to let demo.py save outputs to a directory instead.

[jiapei100]

@ppwwyyxx
Yeah... it's OpenCV's problem. Anyway, specifying --output is working properly. Thank you...