Fix variable name and move models to CPU in Change partition
# What does this PR do ?
Fix tensor parallel variable name and move models to CPU in Change partition

Sidenote: Looks like Megatron models disregard the accelerator mentioned in the trainer. To work things for now, this script manually moves model to CPU

**Collection**: NLP

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**Pre checks**:
- [ ] Make sure you read and followed [Contributor guidelines](https://github.com/NVIDIA/NeMo/blob/main/CONTRIBUTING.md)
- [ ] Did you write any new necessary tests?
- [ ] Did you add or update any necessary documentation?
- [ ] Does the PR affect components that are optional to install? (Ex: Numba, Pynini, Apex etc)
  - [ ] Reviewer: Does the PR have correct import guards for all optional libraries?
  
**PR Type**:
- [ ] New Feature
- [x] Bugfix
- [ ] Documentation


