Can not run Relation-Extraction-BioMegatron.ipynb because of error ModuleNotFoundError: No module named 'apex.normalization'
I couldn't reproduce any training issues with [this notebook](https://colab.research.google.com/github/NVIDIA/NeMo/blob/r1.0.0rc1/tutorials/nlp/Relation_Extraction-BioMegatron.ipynb) running on Colab. A few warnings do appear during installation but they can be disregarded. 
Could you please specify the exact cell you're having errors in?  I am also facing the same issue of   No module named 'apex.normalization'.  if you use NeMo container it has nvidia apex installed, otherwise you need use this link https://github.com/NVIDIA/apex/tree/master/apex 
**Describe the bug**

A clear and concise description of what the bug is.

I am trying to use a pretrained model on the relation extraction task and chem-rot dataset. As suggested by the authors, I'm using the notebook provided: Relation-Extraction-BioMegatron.ipynb

**Steps/Code to reproduce bug**
When I run the codes in the notebook, I get different errors. The first one is inconsistency between torch, torchtext and coda version. I was able to solve this problem by using this command:

```
!pip install torch==1.7.1+cu110 torchvision==0.8.2+cu110 torchaudio==0.7.2 torchtext==0.8 -f https://download.pytorch.org/whl/torch_stable.html

```

Then I had problems with installing apex and I was able to solve by using this code:

```
%%writefile setup.sh


# git clone https://github.com/qywu/apex
# cd apex
# pip install -v --no-cache-dir --global-option="--cpp_ext" --global-option="--cuda_ext" ./
!sh setup.sh
```


Now I have another issue, I can use this command:

```
import apex

```

but this command returns error:

```
from apex.normalization.fused_layer_norm import FusedLayerNorm

ModuleNotFoundError: No module named 'apex.normalization'

```

What do you suggest?


**Expected behavior**

I expect to be able to run the code without any errors.

**Environment overview (please complete the following information)**

 - Environment location: [Bare-metal, Docker, Cloud(specify cloud provider - AWS, Azure, GCP, Collab)]
 - Method of NeMo install: [pip install or from source]. Please specify exact commands you used to install.
 - If method of install is [Docker], provide `docker pull` & `docker run` commands used
I used everything mentioned in this notebook:
`Relation-Extraction-BioMegatron.ipynb`
**Environment details**

If NVIDIA docker image is used you don't need to specify these.
Otherwise, please provide:
- OS version
- PyTorch version
- Python version

**Additional context**

Add any other context about the problem here.
Example: GPU model
I used GPU version of the Google Colab 