Negative Sampling Method for Fusing Knowledge Graph

In order to solve the problem of information overload,recommender systems have been widely studied.Since it is difficult to obtain a large amount of high-quality explicit feedback data,implicit feedback data becomes the mainstream choice for training re-commender systems.Sampling negative instances from unlabeled data,i.e.negative sampling,is crucial for training recommendation models based on implicit feedback data.The previous negative sampling methods often focus on how to select hard negative instances that contain more user preference information,without considering the false negative problem.In order to reduce the false negative probability of negative instances obtained from sampling and make them more informative,a negative sampling method that integrates knowledge graph is proposed.Firstly,constructing a candidate instance set based on the user-item knowledge graph.Then,the negative instance with the lowest false negative probability is selected from the candidate set through a Bayesian classification approach.Finally,based on the Mixup strategy,positive mixing technology is introduced to construct the hard negative instance.To evaluate the effectiveness of the proposed method,validation was conducted on two public datasets.The results show that compared with previous methods,the method proposed in this paper performs better.