On the Use of Unrealistic Predictions in Hundreds of Papers Evaluating Graph Representations
Journal
Proceedings of the 36th AAAI Conference on Artificial Intelligence, AAAI 2022
Journal Volume
36
ISBN
1577358767
Date Issued
2022-06-30
Author(s)
Abstract
Prediction using the ground truth sounds like an oxymoron in machine learning. However, such an unrealistic setting was used in hundreds, if not thousands of papers in the area of finding graph representations. To evaluate the multi-label problem of node classification by using the obtained representations, many works assume that the number of labels of each test instance is known in the prediction stage. In practice such ground truth information is rarely available, but we point out that such an inappropriate setting is now ubiquitous in this research area. We detailedly investigate why the situation occurs. Our analysis indicates that with unrealistic information, the performance is likely over-estimated. To see why suitable predictions were not used, we identify difficulties in applying some multi-label techniques. For the use in future studies, we propose simple and effective settings without using practically unknown information. Finally, we take this chance to compare major graph representation learning methods on multi-label node classification.
Type
conference paper