Traceback (most recent call last):
File "train.py", line 99, in
loss.backward()
File "/media/dat1/users/master/2019/wuyi/anaconda3/envs/M2Det/lib/python3.6/site-packages/torch/tensor.py", line 102, in backward
torch.autograd.backward(self, gradient, retain_graph, create_graph)
File "/media/dat1/users/master/2019/wuyi/anaconda3/envs/M2Det/lib/python3.6/site-packages/torch/autograd/init.py", line 90, in backward
allow_unreachable=True) # allow_unreachable flag
RuntimeError: element 0 of tensors does not require grad and does not have a grad_fn
Traceback (most recent call last): File "train.py", line 99, in
loss.backward()
File "/media/dat1/users/master/2019/wuyi/anaconda3/envs/M2Det/lib/python3.6/site-packages/torch/tensor.py", line 102, in backward
torch.autograd.backward(self, gradient, retain_graph, create_graph)
File "/media/dat1/users/master/2019/wuyi/anaconda3/envs/M2Det/lib/python3.6/site-packages/torch/autograd/init.py", line 90, in backward
allow_unreachable=True) # allow_unreachable flag
RuntimeError: element 0 of tensors does not require grad and does not have a grad_fn
I am very confused, can you help me solve it?