Refer to Urbanowicz R J, Meeker M, La Cava W, et al. Relief-based feature selection: Introduction and review[J]. Journal
of biomedical informatics, 2018, 85: 189-203. Algorithm 1.
Modification: Simplify ramdomly selected target instance R_i to sequential samples in data set. As a result, distance to nearest hit is always 0.
Weitian Wang (2021). Relief feature selection algorithm (https://www.mathworks.com/matlabcentral/fileexchange/90416-relief-feature-selection-algorithm), MATLAB Central File Exchange. Retrieved .
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