[predict_modality] add Simple MLP from Neurips 2021

[KaiWaldrant]

Describe your changes

Issue ticket number and link

Closes #xxxx (Replace xxxx with the GitHub issue number)

Checklist before requesting a review

• [ ] I have performed a self-review of my code

• Check the correct box. Does this PR contain:

  • [ ] Breaking changes
  • [ ] New functionality
  • [ ] Major changes
  • [ ] Minor changes
  • [ ] Bug fixes

• [ ] Proposed changes are described in the CHANGELOG.md

• [ ] CI Tests succeed and look good!

[KaiWaldrant]

limitations:

• Unable to test due to GPU requirements.
• For now too many code changes are required to make it working.

[rcannood]

Superseded by #441