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The number of edges should be same as posive eids.
Co-authored-by: Minjie Wang <wmjlyjemaine@gmail.com>

Co-authored-by: Jinjing Zhou <VoVAllen@users.noreply.github.com>
Co-authored-by: Minjie Wang <wmjlyjemaine@gmail.com>

* link prediction clarification

* fix

* reorg

* change titles

* rm some stale API doc; minor fix

* fix docs

* add warning

* rm new-tutorial run in ci

* lint

* large graph training tutorials

* add full graph link prediction update

* fix

* fix

* fix

* addressed comments

* new tutorials for small graphs

* address changes and use GraphDataLoader

* fix and add data

* fix load_data

* style fixes

* Update 5_graph_classification.py