The invention belongs to the field of
natural language processing, and discloses an
open domain question answering method and
system based on question-
paragraph enhancement and adaptive iteration control, and the method comprises the steps: executing Qaug, entering an
iteration process, and executing Pgen and LLM answer generation after retrieval; a VEDG module is introduced to comprehensively
score the generated answers; when the iteration
step number does not exceed the preset upper limit, judging whether the comprehensive
score reaches a quality threshold: if the comprehensive
score reaches the quality threshold, ending iteration; if not, combining the
retrieval result of the round, the LLM prediction answer and the Qaug result to reconstruct the enhancement problem, and continuing to repeat the process; and when the iteration
step number reaches an upper limit, starting a BPS module,
backtracking prediction answers of all historical iterations, and screening an optimal result. According to the method, the IQP-aug framework is provided, the VEDG module and the BPS module are introduced, self-
adaptive selection of the multi-
granularity iteration step length is achieved, the optimal iteration strategy is generated for the single-hop and multi-hop problems, and computing resources are saved while the framework universality and the result accuracy are improved.