Speed up distributed link prediction; fix the issue of low CPU utilization

[jimjlu99]

🚀 Feature

The CPU utilization of distributed link prediction should be roughly the same as the CPU utilization of distributed node classification.

Motivation

Alternatives

Pitch

Additional context

[TristonC]

For the title, do you mean low GPU utilization? @jimjlu99

[Rhett-Ying]

I think it's CPU utilization.

[github-actions[bot]]

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