THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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To add MPI allReduce distributed training to MXNet and make it cooperate with existing components, like dependency engine, execution engine, operators, NDArray, a new KVStore-MPI is implemented to extend the functionality of the existing KVStore in MXNet. In this section, we will introduce the design and APIs of KVStore-MPI.
Implementation
1) CPP
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