Can DGL overlap sampling and computation When using GPU sampling?

Hello everyone! In this topic, @peizhou001 said " DGL definitely overlap sampling and computation".
However, I think that DGL overlap sampling and computation only when using CPU sampling(if sampler option use_prefetch_thread is True).
And if GPU sampling is used, then use_prefetch_thread must be False, so can DGL overlap GPU sampling and computation? If so, how DGL achieves that, could you please show me the code snippet?
Looking forward to your reply!

Direct to repreat post Can DGL use pipeline parallelism? - #6 by yofufufufu.

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