forward() takes from 3 to 4 positional arguments but 5 were given

[chyphen7]

I am trying to run "python demo/fcos_demo.py", but get the following errors.

(FCOS) PS G:\DeepLearning\segmentation\SipMask\SipMask-benchmark> python demo/fcos_demo.py
Traceback (most recent call last):
File "G:\DeepLearning\segmentation\SipMask\SipMask-benchmark\demo\fcos_demo.py", line 109, in
main()
File "G:\DeepLearning\segmentation\SipMask\SipMask-benchmark\demo\fcos_demo.py", line 101, in main
composite = coco_demo.run_on_opencv_image(img)
File "G:\DeepLearning\segmentation\SipMask\SipMask-benchmark\demo\predictor.py", line 172, in run_on_opencv_image
predictions = self.compute_prediction(image)
File "G:\DeepLearning\segmentation\SipMask\SipMask-benchmark\demo\predictor.py", line 205, in compute_prediction
predictions = self.model(image_list)
File "D:\anaconda3\envs\FCOS\lib\site-packages\torch\nn\modules\module.py", line 889, in _call_impl
result = self.forward(*input, **kwargs)
File "g:\deeplearning\segmentation\sipmask\sipmask-benchmark\fcos_core\modeling\detector\generalized_rcnn.py", line 51, in forward
proposals, proposal_losses = self.rpn(images, features, imge_metas, targets)
File "D:\anaconda3\envs\FCOS\lib\site-packages\torch\nn\modules\module.py", line 889, in _call_impl
result = self.forward(*input, **kwargs)
TypeError: forward() takes from 3 to 4 positional arguments but 5 were given

I am wondering if it is related to incompatibility of torch version or something else? Can anybody help?

Thanks,
Chien