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[FEA] Buffered and In-Memory Sampling #4628

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alexbarghi-nv
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@alexbarghi-nv alexbarghi-nv commented Aug 22, 2024

Adds support for buffered sampling, and supports in-memory sampling as a form of buffered sampling. Also separates the sample readers and sample writers into their own files to make the code easier to read.

Adds support for buffered in-memory sampling in cuGraph-PyG. Updates the PyG examples to add in-memory sampling as an option.

Also fixes a bug where COO output of the distributed sampler (which is rarely used) was overwriting previous batches.

Based on benchmarks on H100, buffered in-memory sampling is 3.2x faster than disk sampling. This results in an overall speedup of 1.25x. This speedup is consistent on SG, MG, and MNMG up to 16 GPUs for ogb-papers100M.

Closes rapidsai/cugraph-gnn#14

@alexbarghi-nv alexbarghi-nv self-assigned this Aug 22, 2024
@alexbarghi-nv alexbarghi-nv added feature request New feature or request non-breaking Non-breaking change and removed python labels Aug 22, 2024
@alexbarghi-nv alexbarghi-nv added breaking Breaking change and removed non-breaking Non-breaking change labels Aug 28, 2024
@alexbarghi-nv alexbarghi-nv marked this pull request as ready for review August 28, 2024 16:01
@alexbarghi-nv alexbarghi-nv requested a review from a team as a code owner August 28, 2024 16:01
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@tingyu66 tingyu66 left a comment

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LGTM

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@rlratzel rlratzel left a comment

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I'm not familiar with this code and the PR is quite large, but I didn't see anything that jumped out as a problem.

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Merged as part of #4660

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[FEA] Support Some Form of In-Memory Sampling
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