"ValueError: Tried to convert 'y' to a tensor and failed. Error: None values not supported."

[yudengdeng]

Hello, your paper on the multi-modal method on crop classification is really great.

But when I followed your readme, renamed data and result folders' names, then tried to replicate your result using "train-gridsearch.py" in folders lstm or bilstm, I encountered the error message of "ValueError: Tried to convert 'y' to a tensor and failed. Error: None values not supported."

When I dug into the codes, I found it happened when it called line 92 in "optimziers.py": "None in grads". I am wondering whether you have any encounter this issue or have you got any suggestion for me?

Thank you very much for your reading and help.