Error when training model based on sar_r31_parallel_decoder_chinese.py configuration file using sgd_600e.py as optimizer

[htaoruan]

The error is as follows：
Traceback (most recent call last):
File "tools/train.py", line 243, in
run_train_cmd(args)
File "tools/train.py", line 231, in run_train_cmd
train_detector(
File "/home/Anaconda/anaconda3/envs/metacv/lib/python3.8/site-packages/mmocr/apis/train.py", line 155, in train_detector
runner.run(data_loaders, cfg.workflow)
File "/home/Anaconda/anaconda3/envs/metacv/lib/python3.8/site-packages/mmcv/runner/epoch_based_runner.py", line 130, in run
epoch_runner(data_loaders[i], **kwargs)
File "/home/Anaconda/anaconda3/envs/metacv/lib/python3.8/site-packages/mmcv/runner/epoch_based_runner.py", line 52, in train
self.call_hook('after_train_iter')
File "/home/Anaconda/anaconda3/envs/metacv/lib/python3.8/site-packages/mmcv/runner/base_runner.py", line 309, in call_hook
getattr(hook, fn_name)(self)
File "/home/Anaconda/anaconda3/envs/metacv/lib/python3.8/site-packages/mmcv/runner/hooks/optimizer.py", line 64, in after_train_iter
runner.optimizer.step()
File "/home/Anaconda/anaconda3/envs/metacv/lib/python3.8/site-packages/torch/optim/optimizer.py", line 88, in wrapper
return func(*args, **kwargs)
File "/home/Anaconda/anaconda3/envs/metacv/lib/python3.8/site-packages/torch/autograd/grad_mode.py", line 28, in decorate_context
return func(*args, **kwargs)
File "/home/Anaconda/anaconda3/envs/metacv/lib/python3.8/site-packages/torch/optim/sgd.py", line 120, in step
momentum = group['momentum']
KeyError: 'momentum'