RuntimeError: Given groups=1, weight of size [64, 11, 3, 3], expected input[1, 6 72, 672, 11] to have 11 channels, but got 672 channels instead

[tonyboston-au]

Running Demo.ipynb yields runtime error at line:
prediction = torch.sigmoid(model(input_img)).data[0].cpu().numpy()

RuntimeError: Given groups=1, weight of size [64, 11, 3, 3], expected input[1, 6
72, 672, 11] to have 11 channels, but got 672 channels instead

Running:
python3/3.6.7
pytorch/0.4.1-py36
cuda/9.0
gcc/4.9.0
opencv-python/3.4.4
numpy/1.15.4

Any suggestions appreciated.