[Model] Add `dgl.nn.CuGraphSAGEConv` model #5137

tingyu66 · 2023-01-10T15:47:18Z

Description

This PR adds a GraphSAGE model Add dgl.nn.CuGraphSAGEConv that uses the accelerated sparse aggregation primitives in cugraph-ops. It requires pylibcugraphops >= 23.02.

Checklist

Please feel free to remove inapplicable items for your PR.

The PR title starts with [$CATEGORY] (such as [NN], [Model], [Doc], [Feature]])
I've leverage the tools to beautify the python and c++ code.
The PR is complete and small, read the Google eng practice (CL equals to PR) to understand more about small PR. In DGL, we consider PRs with less than 200 lines of core code change are small (example, test and documentation could be exempted).
All changes have test coverage
Code is well-documented
To the best of my knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change
Related issue is referred in this PR
If the PR is for a new model/paper, I've updated the example index here.

Changes

New nn.Module: dgl.nn.CuGraphSAGEConv
Test that validates its results against SAGEConv

Notes

Fixes rapidsai/cugraph-ops#177.

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… to forward()

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mufeili · 2023-02-17T07:40:12Z

python/dgl/nn/pytorch/conv/cugraph_sageconv.py

+
+    def reset_parameters(self):
+        r"""Reinitialize learnable parameters."""
+        self.linear.reset_parameters()


Previously SageConv considers Xavier uniform while nn.Linear.reset_parameters considers Kaiming uniform. I'm not sure about the effects of this difference.

I think Kaiming is more suitable here as ReLU is often the choice for the nonlinearity in GNN; Xavier was designed for sigmoid function.

mufeili · 2023-02-17T07:43:16Z

python/dgl/nn/pytorch/conv/cugraph_sageconv.py

+        r"""Reinitialize learnable parameters."""
+        self.linear.reset_parameters()
+
+    def forward(self, g, feat, max_in_degree=None):


another difference, lack of support for edge_weight

python/dgl/nn/pytorch/conv/cugraph_sageconv.py

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mufeili · 2023-02-17T08:46:01Z

examples/advanced/cugraph/graphsage.py

@@ -0,0 +1,200 @@
+import argparse


Did you run this script? If so, what performance number did you obtain?

Yes, in terms of pure training time (not including dataloading), SAGEConv takes 2.5s per epoch, while CuGraphSAGEConv takes 2.0s, despite the overhead of coo-to-csc conversion. Test accuracy is also the same.

Edit: add timings for both mode in the example

mode mixed (uva) pure gpu

CuGraphSAGEConv 2.0 s 1.2 s

SAGEConv 2.5 s 1.7 s

mufeili · 2023-02-17T09:00:07Z

examples/advanced/cugraph/graphsage.py

+    def forward(self, blocks, x):
+        h = x
+        for l, (layer, block) in enumerate(zip(self.layers, blocks)):
+            h = layer(block, h, max_in_degree=10)


This seems a bit ugly. Perhaps it's better to pass the argument to SAGE.__init__.

Can you explain what needs to be done here? Are you suggesting to unpack to loop like this?

h = F.relu(self.conv1(g[0], x)) h = F.relu(self.conv2(g[1], h)) ...

I meant the specification of max_in_degree.

I see and I do agree that it is not an ideal interface. We did not make max_in_degree an attribute of CuGraphSAGEConv since it is a property of the graph (i.e., block), rather than the model. I have removed it from the example as this flag is optional.
In the meantime, we are improving our aggregation primitives to be more flexible to eventually ditch this option.

mufeili · 2023-02-17T09:13:12Z

examples/advanced/cugraph/graphsage.py

+        default="mixed",
+        choices=["cpu", "mixed", "puregpu"],
+        help="Training mode. 'cpu' for CPU training, 'mixed' for CPU-GPU mixed training, "
+        "'puregpu' for pure-GPU training.",


This is automatically formatted by lintrunner. I removed the cpu mode, as it is not supported by the model

Changes pushed.

mufeili

done a pass

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docs/source/api/python/nn-pytorch.rst

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tingyu66 · 2023-02-21T22:05:33Z

Thank you @mufeili for the review. Here is a list of disparities between CuGraphSAGEConv and SAGEConv:

SAGEConv allows different feature dimensions for source and destination nodes
They cover different aggregation types
CuGraphSAGEConv does not support edge weights

Some preliminary performance numbers using the included example:

mode	mixed (uva)	pure gpu
CuGraphSAGEConv	2.0 s	1.2 s
SAGEConv	2.5 s	1.7 s

(copied over from the review comment above for better visibility)

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mufeili · 2023-02-22T04:29:19Z

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* add CuGraphSAGEConv model * fix lint issues * update model to reflect changes in make_mfg_csr(), move max_in_degree to forward() * lintrunner * allow reset_parameters() * remove norm option, simplify test * allow full graph fallback option, add example * address comments * address reviews --------- Co-authored-by: Mufei Li <mufeili1996@gmail.com>

add CuGraphSAGEConv model

5a7c648

tingyu66 marked this pull request as draft January 10, 2023 15:50

fix lint issues

cd4c4fa

update model to reflect changes in make_mfg_csr(), move max_in_degree…

d4e9688

… to forward()

lintrunner

310d5b2

allow reset_parameters()

59c0d87

tingyu66 mentioned this pull request Jan 20, 2023

Add/Update cugraph-ops models #5218

Closed

tingyu66 marked this pull request as ready for review January 20, 2023 03:56

remove norm option, simplify test

9e729a3

tingyu66 changed the title ~~[DO NOT MERGE][Model] Add dgl.nn.CuGraphSAGEConv model~~ [Model] Add dgl.nn.CuGraphSAGEConv model Feb 2, 2023

tingyu66 added 2 commits February 16, 2023 21:39

Merge remote-tracking branch 'upstream/master' into cugraphops-sageconv

86a0bcd

allow full graph fallback option, add example

a528321

mufeili reviewed Feb 17, 2023

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address comments

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address reviews

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Merge branch 'master' into cugraphops-sageconv

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Merge branch 'master' into cugraphops-sageconv

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mufeili approved these changes Feb 22, 2023

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mufeili merged commit bcf9923 into dmlc:master Feb 22, 2023

tingyu66 deleted the cugraphops-sageconv branch February 22, 2023 15:10

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[Model] Add dgl.nn.CuGraphSAGEConv model #5137

[Model] Add dgl.nn.CuGraphSAGEConv model #5137

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tingyu66 commented Jan 10, 2023 • edited Loading

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[Model] Add `dgl.nn.CuGraphSAGEConv` model #5137

[Model] Add `dgl.nn.CuGraphSAGEConv` model #5137

tingyu66 commented Jan 10, 2023 •

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