Add FedPFT baseline

[mahdibeit]

Issue

Description

This PR adds FedPFT baseline as introduced in the "Parametric Feature Transfer: One-shot Federated Learning with Foundation Models" paper.

Related issues/PRs

Implements #3232

Proposal

Explanation

Implements FedPFT as a baseline.

Checklist

• Implement proposed change
• Write tests
• Update documentation
• Update the changelog entry below
• Make CI checks pass
• Ping maintainers on Slack (channel #contributions)

Changelog entry

Any other comments?

[jafermarq]

Hi @mahdibeit , i did a couple of small fixes. now the test pipeline starts but you'll notice that mypy shows some errors. Let me know when you have some time to take a look.

[mahdibeit]

Hi @jafermarq, thanks for taking the time to fix the issues. I noticed that the test-baseline.sh script that I ran did not do all the tests (like mypy or lint). I fixed all the issues this time and ran it successfully without errors. Let me know if it requires any further changes.

[jafermarq]

@mahdibeit , cool. The tests pass. I'll take a closer look into the code today/tomorrow and get back to you if i see something that we could improve. In most baselines, contributors decided to add their contact details (e.g. email address) in the contributors point under the About this baseline section. Feel free to do that if you wish.

[mahdibeit]

Awesome. Thank you so much @jafermarq. I look forward to your review. Thanks for your suggestion. I added my email to the README file.

[jafermarq]

Hi @mahdibeit , I was able to reproduce the results you show in the plot at the end of your README.md (but needed to make the small changes i suggest in my review below). Let me know what you think.

The PR is in a pretty good state so once those small issues are resolved it can be merged 🙌

[mahdibeit]

Hi @jafermarq, that is great news. I merged the suggested changes. Everything looks great to me.

[jafermarq]

Great! FedPFT is great and really fast! 🚀