[QUESTION]UnboundLocalError：local variable ‘output tensor’ referenced before assignmnet

[zmtttt]

I pretrain Llama3-8B，but met the problem:
(1)the configuration : vp2, pp 8, 8gpus, meeting the erros:
deallocate_output_tensor(output_tensor, config.deallocate_pipeline_outputs)，
UnboundLocalError：local variable ‘output tensor’ referenced before assignmnet

(2)but when I change the pp from 8 to 4, it can work well.

why? have someone met the same problem?