ImportError: Apex was not found. Please see the NeMo README for installation instructions: https://github.com/NVIDIA/NeMo#megatron-gpt.
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When running the below code segment
```
from nemo.collections.nlp.parts.megatron_trainer_builder import MegatronLMPPTrainerBuilder
from nemo.utils.exp_manager import exp_manager

trainer = MegatronLMPPTrainerBuilder(cfg).create_trainer()
exp_manager(trainer, cfg.exp_manager)
```
I am getting the error
```
ImportError: Apex was not found. Please see the NeMo README for installation instructions: https://github.com/NVIDIA/NeMo#megatron-gpt.
```
So as per the official documentation when I try to install Apex,
```
git clone https://github.com/NVIDIA/apex.git
cd apex
git checkout b496d85fb88a801d8e680872a12822de310951fd
pip install -v --no-build-isolation --disable-pip-version-check --no-cache-dir --config-settings "--build-option=--cpp_ext --cuda_ext --fast_layer_norm --distributed_adam --deprecated_fused_adam" ./
```
this installation raises the given error
```

Usage:
  pip install [options] <requirement specifier> [package-index-options] ...
  pip install [options] -r <requirements file> [package-index-options] ...
  pip install [options] [-e] <vcs project url> ...
  pip install [options] [-e] <local project path> ...
  pip install [options] <archive url/path> ...
no such option: --config-settings
```
![Screenshot from 2024-04-04 10-51-03](https://github.com/NVIDIA/NeMo/assets/41164884/3b5722df-c1e1-499d-ae04-56a11eb163eb)
