Typo in train test split of Link Prediction tutorial

[aaprasad]

📚 Documentation

Issue with link prediction tutorial

Hi, in the link prediction tutorial, it seems like there's a typo where you flipped the train and test sets.
for instance in "Preparing train and test set"

test_pos_u, test_pos_v = u[eids[:test_size]], v[eids[:test_size]]
train_pos_u, train_pos_v = u[eids[test_size:]], v[eids[test_size:]]
...
train_g = dgl.remove_edges(g, eids[:test_size])

[github-actions]

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