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[DeviceAPI] Support "GetCurrentStream" (#16689)
This PR introduces a new function `GetCurrentStream`to device API, which returns the current stream of the given device. Meanwhile, this PR updates the "CreateStream" of CUDA to creating a non-blocking stream, so that the execution on this stream can overlap with the execution of other streams. This PR also changes the `GPUCopy` of CUDA device API to always using `cudaMemcpyAsync`.
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