The application discloses a trigger node detection method and device, equipment and a storage medium, and relates to the technical field of graph
backdoor detection. The method comprises the following steps: performing node vector learning on graph data through a target graph neural network to obtain a target node vector corresponding to the graph data; performing clustering screening on the target node vector through a target clustering
algorithm to determine an abnormal node in the graph data; performing structural disturbance on the abnormal node, calculating a target drift
score of the abnormal node after the structural disturbance; generating a
discrimination threshold based on the target drift
score, and screening a trigger node in the graph data from the abnormal node according to the
discrimination threshold. Through the cooperative mechanism of the representation learning to establish the discrimination basis, the clustering screening to narrow the search space, the structural disturbance to
expose the stability difference, and the statistical modeling to automatically make decisions, the technical problem that it is difficult to accurately identify the hidden trigger node in the graph data is solved, and the stability and reliability of the detection process are improved.