Online interactive question and answer text feature construction method and system

The invention provides an online interactive question and answer text feature construction method and system, and relates to the technical field of text feature mining. According to the method, a topic feature construction method suitable for the field is designed based on a BERTopic model, a document embedding model is improved by the method, namely, a task self-adaptive pre-training method is integrated, and accurate capture of semantic information is achieved; meanwhile, an interaction feature construction method based on similarity dynamic integration is provided, various similarity algorithms are organically combined through dynamic integration, a similarity matrix is obtained, and the accuracy of multi-dimensional mining interaction information is improved; and designing a question and answer text feature importance adaptive discrimination model fusing a multi-head attention mechanism and a gating mechanism, considering differential prediction or classification performance of different text features, ad