In this paper, we propose DimonGen, which aims to generate diverse sentences describing concept relationships in various everyday scenarios.To support this, we first create a benchmark dataset for this task by adapting the existing CommonGen dataset.We then propose a two-stage model called MoREE to generate the target sentences.MoREE consists of a mixture of retrievers model that retrieves diverse context sentences related to the given concepts, and a mixture of generators model that generates diverse sentences based on the retrieved contexts.We conduct experiments on the DimonGen task and show that MoREE outperforms strong baselines in terms of both the quality and diversity of the generated sentences.Our results demonstrate that MoREE is able to generate diverse sentences that reflect different relationships between concepts, leading to a comprehensive understanding of concept relationships. 1

We propose DEER (Descriptive Knowledge Graph for Explaining Entity Relationships)an open and informative form of modeling entity relationships.In DEER, relationships between entities are represented by free-text relation descriptions.For instance, the relationship between entities of machine learning and algorithm can be represented as "Machine learning explores the study and construction of algorithms that can learn from and make predictions on data."To construct DEER, we propose a self-supervised learning method to extract relation descriptions with the analysis of dependency patterns and generate relation descriptions with a transformer-based relation description synthesizing model, where no human labeling is required.Experiments demonstrate that our system can extract and generate highquality relation descriptions for explaining entity relationships.The results suggest that we can build an open and informative knowledge graph without human annotation.