Cannot run Megatron_Synthetic_Tabular_Data_Generation.ipynb on google colab

I am trying to run the tutorial notebook Megatron_Synthetic_Tabular_Data_Generation.ipynb on notebook, and after I install the requirements, and datasets, I runned the pretraining GPT step. But the scripts have the error log out: cannot import name ‘helpers’ from ‘nemo.collections.nlp.data.language_modeling.megatron’ which I could not find out a resolution for it.