The invention relates to a
data processing method and device based on multi-
modal contrast fusion and a graph neural network, and a medium. The method comprises the following steps: collecting multi-
modal biomedical data set samples of
mRNA expression data,
DNA methylation data and
miRNA expression data; embedded matrixes of three
modes are obtained through an independent
feedforward neural network encoder; adopting a contrast learning
mechanism based on NT-Xent to carry out unsupervised contrast alignment on the embedded matrixes of different modalities, and generating aligned embedded matrixes of three modalities; embedding and stacking the aligned modalities into a sequence, and inputting the sequence into a multi-layer Transform
encoder to obtain a unified fusion representation; normalizing the fusion representation, and constructing a sample similarity graph structure; and based on the graph structure and the fusion representation, node high-order adjacency features are extracted through a three-layer graph convolutional network,
sample classification is completed in combination with two full-connection
layers, and a
sample classification result is output. Compared with the prior art, the method has the advantages of cross-
modal data fusion optimization, medical
data discrimination enhancement, high efficiency and the like.