How could I train the DSOD ?

When I train the DSOD, I did not load the reducefc.pth, and I replaced the "SSD" with the "DSOD", but something wrong occured."IndexError: invalid index of a 0-dim tensor. Use `tensor.item()` in Python or `tensor.item<T>()` in C++ to convert a 0-dim tensor to a number
"  could you tell me what should I do to solve it?