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[Feature request] Add adversarial negative loss for link prediction
Based on our DGL-KE project, adversarial negative loss is useful to improve link prediction model performance.
https://github.com/awslabs/dgl-ke/blob/43875a57a721d62396d05235226b13e6c2db1a2a/python/dglke/models/pytorch/loss.py#L85-L90