an error

[cabbag-ml]

模型已经显示加载成功 但还是报错 请问这个问题怎么解决？
Global Adaptive Pooling
Weighted Regularized Triplet: off
Start epoch: 20
Path to the checkpoint of optimizer: ../pretrain/market1501_AGW_20.pth
Path to the checkpoint of center_param: ../pretrain/market1501_AGW_20.pth
Path to the checkpoint of optimizer_center: ../pretrain/market1501_AGW_20.pth
Traceback (most recent call last):
File "D:\ProgramData\PythonProject\ReID-Survey-master\tools\main.py", line 112, in
main()
File "D:\ProgramData\PythonProject\ReID-Survey-master\tools\main.py", line 85, in main
optimizer['model'].load_state_dict(torch.load(path_to_optimizer))
File "D:\StudySoftware\Anaconda\envs\pytorch1.0.0\lib\site-packages\torch\optim\optimizer.py", line 106, in load_state_dict
saved_groups = state_dict['param_groups']
KeyError: 'param_groups'