plot problem

[ucmmesa]

When I execute the plot.py,I got following error prompt:
Traceback (most recent call last):
File "plot.py", line 57, in
accuracy = [float(s['accuracy']) for s in stats]
File "plot.py", line 57, in
accuracy = [float(s['accuracy']) for s in stats]
ValueError: could not convert string to float: "tensor(0.9098, device='cuda:0')"

I am puzzled,can you give me any suggestions?