feat(baselines) Add baseline FedBABU

[KarhouTam]

Issue

Add new baseline FedBABU
https://arxiv.org/abs/2106.06042

Description

Related issues/PRs

Placeholder issue: #4285

[KarhouTam]

Hi, @jafermarq
I found that the deps versions in baseline template are somehow outdated.

For example, I need flwr_datasets.preprocessor.Merger, but flwr_datasets 0.1.0 will be installed by pip install -e . command and it doesn't support that. Maybe the deps verisions need to be updated.

[jafermarq]

Hi @KarhouTam, what version of flower I you using? The flower baselines template is using the latest release as a minimum version:

flower/src/py/flwr/cli/new/templates/app/pyproject.baseline.toml.tpl

Line 12 in b857425

"flwr-datasets[vision]>=0.3.0",

Note to create the baseline, it's best to do it like this (since it will also populate a README.md and create auxiliary files you might need -- it's very similar to the previous baseline format but now using flwr new/run style):

flwr new fedbabu 
# then choose Flower Baseline template (should be option 8)

[KarhouTam]

Seems I forgot to update my local flwr version first 😂. Nevermind.