Add `nn.models.GRetriever`

[puririshi98]

1. https://github.com/pyg-team/pytorch_geometric/pull/9462
2. -> https://github.com/pyg-team/pytorch_geometric/pull/9480
3. https://github.com/pyg-team/pytorch_geometric/pull/9481
4. https://github.com/pyg-team/pytorch_geometric/pull/9167

---

breaking https://github.com/pyg-team/pytorch_geometric/pull/9167/ down further, focusing on G-retriever model this time

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 14.28571% with 120 lines in your changes missing coverage. Please review.

Project coverage is 87.39%. Comparing base (fbafbc4) to head (dd651be). Report is 4 commits behind head on master.

Files	Patch %	Lines
torch_geometric/nn/models/g_retriever.py	17.56%	61 Missing :warning:
torch_geometric/nn/nlp/llm.py	9.23%	59 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9480      +/-   ##
==========================================
+ Coverage   86.93%   87.39%   +0.46%     
==========================================
  Files         464      478      +14     
  Lines       30755    31236     +481     
==========================================
+ Hits        26737    27299     +562     
+ Misses       4018     3937      -81     

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[akihironitta]

I wonder from next time if it would make sense to start adding models to torch_geometric.contrib.nn first and then promote them to torch_geometric.nn when we're confident about the code around them.

[puririshi98]

I wonder from next time if it would make sense to start adding models to torch_geometric.contrib.nn first and then promote them to torch_geometric.nn when we're confident about the code around them.

from NVIDIAs pov we are already including this in our containers each release so I'd rather save the effort of moving these too pyg.contrib and wait until all of your needs are met before merging these prs. I will address these reviews as soon as i can, and will gladly address any follow up reviews

[puririshi98]

@rusty1s @akihironitta anything else needed to merge the 3 remaining PRs?

[rusty1s]

Very clean now, thanks for the updates :)