Added the support of FesMos

[NingxinSu]

Implemented the FedMos under Customized Client Training Loops/ by its source code in https://github.com/Distributed-Learning-Networking-Group/FedMoS.

Description

FedMoS is a communication-efficient FL framework with coupled double momentum-based update and adaptive client selection, to jointly mitigate the intrinsic variance. It was published in INFOCOM 2023. This pull request simply implemented FedMos, debugged and deleted the errors in its code.

How has this been tested?

It can be tested by the following command:
python examples/customized_client_training/fedmos/fedmos.py -c examples/customized_client_training/fedmos/fedmos_MNIST_lenet5.yml

Types of changes

• Bug fix (non-breaking change which fixes an issue) Fixes #
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code has been formatted using Black and checked using PyLint.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

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