Text topic extraction method and device based on LDA equivalent description and storage medium

The invention discloses a text topic extraction method and device based on LDA equivalent description and a storage medium, and relates to the technical field of text topic extraction, and the text topic extraction method based on LDA equivalent description comprises the following steps: constructing a probability graph model-maximum likelihood optimization converter, establishing an equivalence relation between the basic maximum likelihood optimization problem and the basic probability graph model; according to the basic probability graph model, constructing a target maximum likelihood optimization problem for the LDA probability graph model; solving a target maximum likelihood optimization problem, and calculating model parameters of the LDA probability graph model according to the solution of the target maximum likelihood optimization problem; extracting word frequency vector representation of the target text; and calculating a text topic of the target text according to the word frequency vector, the LDA p