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hierarchical_allreduce_4x2nodes.xml
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<algo name="hierarchical_allreduce" proto="Simple" nchannels="6" nchunksperloop="8" ngpus="8" coll="allreduce" inplace="1">
<gpu id="0" i_chunks="8" o_chunks="0" s_chunks="0">
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</gpu>
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</gpu>
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<tb id="4" send="4" recv="6" chan="2">
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<tb id="5" send="4" recv="6" chan="3">
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</tb>
</gpu>
</algo>