The document discusses topic detection in big data and reviews approaches to integrating semantic and co-occurrence relationships when detecting topics. It notes that traditional topic modeling approaches like LDA focus on prominent topics and do not consider latent or rare topics that are important for decision making. The proposed approach aims to address this by constructing a term graph that combines semantic and co-occurrence relationships to allow detection of both frequent and rare topics. It seeks to leverage implicit relationships between terms through their shared contexts to better uncover topics from large document collections.