The invention relates to a long-
tail recommendation method and
system based on multi-agent collaborative reasoning, and belongs to the technical field of personalized recommendation. The method comprises the following steps: performing
text enhancement on user and project data, and constructing a semantic
data set; constructing and training a candidate item retrieval model with long-
tail perception capability; searching candidate items for a target user, and constructing a deep user portrait containing a personalized novelty exploration coefficient; starting a multi-agent collaborative reasoning process, and rearranging candidate items through multi-dimensional evaluation, strategy sorting and adaptive causal
depolarization; and finally, generating a personalized recommendation
list, and performing iterative optimization based on
user feedback. According to the method, the recommendation task is decomposed into a collaborative reasoning step of a plurality of agents, and a personalized and causal-driven prejudice removing mechanism is introduced, so that the accuracy of overall recommendation is not damaged while the
exposure and recommendation diversity of the long-
tail project are improved, and a more fair and transparent
recommendation service conforming to the real exploration intention of the user is provided for the user.