Method to process single cell gene expression data to reveal gene-gene correlations by applying a noise regularization process to reduce the gene-gene correlation artifacts. The computer-implemented method of the present application comprises processing gene expression data for normalization or imputation, applying a noise regularization process to the normalized or imputed gene expression data, and applying gene-gene correlation calculation process to obtain correlated gene pairs. Random noises based on an expression value of a gene in a cell in an expression matrix are added to obtain a noise regularized expression matrix.
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