Add isend irecv batch_isend_irecv reduce_scatter#4970

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ForFishes wants to merge 6 commits intoPaddlePaddle:developfrom

ForFishes:add_send_recv

Commits on Jun 29, 2022

fix dataset
ForFishes
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add doc
ForFishes
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Commits on Jul 6, 2022

Commits on Jul 11, 2022

fix doc of rank message
ForFishes
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