THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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SgNgraphSelector inherits SubgraphSelector to provide an interface to the subgraph selection mechanism, and SgNgraphProperty inherits Subgraph Property to provide a way to create nGraph subgraphs.
When compiling with nGraph, NDArray now contains a method get_tensor to enable memory sharing between nGraph and MXNet. This enables us to avoid copying or reallocating memory.
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