Dev/v0.7.0#1500

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liuliuliu0605 wants to merge 3 commits intoFedML-AI:dev/v0.7.0from

liuliuliu0605:dev/v0.7.0

Commits on Oct 27, 2023

add mpi version of hierarchical fl and examples
liuliuliu0605
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add mixing operation between edge servers according to some topology
liuliuliu0605
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redefine local loss function to support weighted mixing
liuliuliu0605
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