hello, when I run retinanet.py, it shows error:
Traceback (most recent call last): File "retinanet.py", line 58, in <module> test() File "retinanet.py", line 56, in test cls_preds.backward(cls_grads) File "/home/ztgong/local/anaconda2/lib/python2.7/site-packages/torch/tensor.py", line 93, in backward torch.autograd.backward(self, gradient, retain_graph, create_graph) File "/home/ztgong/local/anaconda2/lib/python2.7/site-packages/torch/autograd/__init__.py", line 89, in backward allow_unreachable=True) # allow_unreachable flag RuntimeError: Trying to backward through the graph a second time, but the buffers have already been freed. Specify retain_graph=True when calling backward the first time.
how to fix it? can you give some advises? thankyou
stillwaterman
commented
5 years ago
hello, when I run retinanet.py, it shows error:
Traceback (most recent call last): File "retinanet.py", line 58, in <module> test() File "retinanet.py", line 56, in test cls_preds.backward(cls_grads) File "/home/ztgong/local/anaconda2/lib/python2.7/site-packages/torch/tensor.py", line 93, in backward torch.autograd.backward(self, gradient, retain_graph, create_graph) File "/home/ztgong/local/anaconda2/lib/python2.7/site-packages/torch/autograd/__init__.py", line 89, in backward allow_unreachable=True) # allow_unreachable flag RuntimeError: Trying to backward through the graph a second time, but the buffers have already been freed. Specify retain_graph=True when calling backward the first time.how to fix it? can you give some advises? thankyou