ASR tutorial based on Nemo: cannot import name 'SCMode' from 'omegaconf'
This [notebook ](https://github.com/NVIDIA/NeMo/blob/v1.0.2/tutorials/asr/01_ASR_with_NeMo.ipynb)under Ubuntu fails to `import nemo.collections.asr as nemo_asr` 

Here is the exception report:
`ImportError: cannot import name 'SCMode' from 'omegaconf' (/home/joepareti54/anaconda3/lib/python3.8/site-packages/omegaconf/__init__.py)`