NameError: name 'decode' is not defined

[LinXin04]

File "/workspace/bin/base/base_trainer.py", line 104, in train

self._on_epoch_finish()
File "/workspace/bin/trainer/trainer.py", line 159, in _on_epoch_finish
recall, precision, hmean = self._eval()
File "/workspace/bin/trainer/trainer.py", line 144, in _eval
preds, boxes_list = decode(preds)
NameError: name 'decode' is not defined
main process return code: 0