Abstract
Knowledge graph (KG) embedding models are proposed to encode entities and relations into a low-dimensional vector space, in turn, can support various machine learning models on KG completion with good performance and robustness. However, the current entity ranking protocol about KG completion cannot adequately evaluate the impacts of KG embedding models in real-world applications. However, KG embeddings is not widely used as word embeddings. An asserted powerful KG embedding model may not be effective in downstream tasks. So in this paper, we commit to finding the answers by using downstream tasks instead of entity ranking protocol to evaluate the effectiveness of KG embeddings. Specifically, we conduct comprehensive experiments on different KG embedding models in KG based recommendation and question answering tasks. Our findings indicate that: 1) Modifying embeddings by considering more complex KG structural information may not achieve improvements in practical applications, such as updating TransE to TransR. 2) Modeling KG embeddings in non-euclidean space can effectively improve the performance of downstream tasks.
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Acknowledgements
We are very grateful to Professor Li Xue of the Neusoft for his help in this article. This work is supported in part by the National Natural Science Foundation of China (grants No. 61772268 and 61906037); State Key Laboratory for smart grid protection and operation control Foundation; Association of Chinese Graduate Education (ACGE); the Fundamental Research Funds for the Central Universities (NS2018057, NJ2018014).
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Zhang, Y., Li, B., Gao, H., Ji, Y., Yang, H., Wang, M. (2020). Fine-Grained Evaluation of Knowledge Graph Embedding Models in Downstream Tasks. In: Wang, X., Zhang, R., Lee, YK., Sun, L., Moon, YS. (eds) Web and Big Data. APWeb-WAIM 2020. Lecture Notes in Computer Science(), vol 12317. Springer, Cham. https://doi.org/10.1007/978-3-030-60259-8_19
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