Extracting topics is a good unsupervised data-mining technique to discover the underlying relationships between texts. There are many different approaches with the most popular probably being LDA but…
T. Kinsman, M. Wessel, M. Gerosa, и C. Treude. 2021 IEEE/ACM 18th International Conference on Mining Software Repositories (MSR), стр. 420--431. IEEE, (2021)